French doors are a pair of side-hinged door leaves, glazed across most of each panel, where both leaves operate independently and no fixed post divides the opening. The term also gets applied to a refrigerator style, but in construction it describes a glazed door assembly built to deliver daylight and full-width passage at the same time. Below we cover where the design came from, how the hardware works, which way the leaves should swing, what sizes exist, what materials perform in a cold climate, how the doors seal and lock, and what local builders actually specify.

What Are French Doors?

French doors are two side-hinged door leaves that meet at the center of a single frame, with glass covering most of each panel and both leaves able to open. The glass area is the defining feature. A French door panel is mostly glazing held by narrow stiles and rails, which is why the assembly reads as a window that happens to open like a door.

Both leaves operating is the second defining feature. One leaf carries the working handle and latch, and the other locks into the head and sill so it can stand fixed for daily use or release to open the full width. Releasing both leaves clears the entire opening with no post in the middle, which is what makes the design useful for moving furniture, opening a room to a deck, or connecting a kitchen to a patio. Our French patio doors come in hinged configurations in wood and composite, and the same panel design also appears in entry and interior applications.

What Is the Difference Between French Doors and Double Doors?

The difference between French doors and double doors is that French doors are glazed across most of both panels and are built for both leaves to be used regularly, while double doors are usually solid or partly glazed with one primary leaf handling daily traffic. Double doors place the lock cylinder on the main leaf and hold the secondary leaf with manual bolts, so the second panel opens occasionally. French door leaves are symmetrical, each carries its own locking engagement, and the pair is designed for frequent full-width opening.

Why Are They Called French Doors?

They are called French doors because the design originated in France during the 16th and 17th centuries as a hybrid between a casement window and a door. French builders of that period were working with a scarcity of interior daylight and no electric lighting, so they extended tall casement glazing down to floor level and hinged it as a passage. The French name for the result, porte-fenetre, translates literally as door-window.

Door-window describes the function precisely, and the function never changed. A French door still solves the same problem the Renaissance version solved, which is delivering daylight deep into a room through an opening people can also walk through. That dual purpose explains why French doors carry far more glass than a standard entry slab and why the stiles and rails stay narrow. Every design choice in the assembly traces back to maximizing glazed area without giving up structure.

How Do French Doors Work?

French doors work by hanging two glazed leaves on opposite jambs of one frame, with an active leaf that latches and an inactive leaf that bolts into the head and the sill. The active leaf carries the handle set and the primary lock. The inactive leaf carries flush bolts or shoot bolts that drive vertically into the frame, holding it rigid so the active leaf has something solid to latch against.

Shoot bolts are what turn two independent panels into one weathertight assembly. When the bolts retract, the inactive leaf becomes a second operating door. When they extend, that leaf functions as a fixed jamb. This is the mechanical reason a French door can behave like a single door on a Tuesday afternoon and a six-foot opening on a Saturday.

What Is an Astragal on a French Door?

An astragal on a French door is the vertical member that covers the joint where the two leaves meet. Astragals mount to the edge of the inactive leaf and overlap the active leaf when both are closed, which blocks the sightline through the gap and gives the weatherstripping a surface to compress against. The astragal also carries the strike plate that the active leaf’s latch and deadbolt engage, so it does structural work as well as sealing work.

Do Both Doors Open on French Doors?

Yes, both doors open on French doors. Each leaf is hinged to its own jamb, and retracting the flush bolts on the inactive leaf frees it to swing exactly like the active one. Most households operate one leaf daily and open the pair when they need the full width. That flexibility is the practical argument for the configuration over a single wide door.

How Do You Keep French Doors Open?

You keep French doors open with cabin hooks, magnetic catches, floor-mounted door stops, or hold-open arms mounted to the jamb. Wind is the reason hold-open hardware matters on exterior pairs. A glazed leaf catches air like a sail, and an unrestrained leaf slamming into a stop can crack glazing or spring a hinge. Specify hold-open hardware at the same time you specify the handle set, because retrofitting it later means drilling a finished door.

Should French Doors Open In or Out?

French doors should open inward in most residential installations, because inswing units shed water better at the threshold and keep the leaves protected from wind. Inswing is the default configuration across the industry, and it is what most manufacturers build unless an outswing is specified. The inswing threshold sits under the door with the weatherstripping compressed from the interior side, which is the geometry that resists driven rain most reliably.

Outswing earns its place when interior floor space is the binding constraint. A pair of 36-inch leaves swinging into a room consumes 36 inches of clear floor on both sides of the opening, and that footprint kills furniture layouts in smaller rooms. Choosing the right patio door often comes down to whether that floor area is available.

Can French Doors Open Outward?

Yes, French doors can open outward, and most major manufacturers offer outswing as a standard or special-order configuration. Outswing units require exterior clearance across the full arc of both leaves, a landing that meets code, and security hinges with non-removable pins, since the hinge barrels sit on the exterior face where they are reachable. Outswing also performs strongly against wind-driven rain, because pressure pushes the leaves harder into their seals rather than away from them.

How Much Clearance Do French Doors Need to Swing?

French doors need clearance equal to the width of each individual leaf, measured from the hinge jamb along the full swing arc. A 72-inch pair splits into two 36-inch leaves, so each leaf needs 36 inches of unobstructed floor on the swing side. Furniture, floor registers, stair landings, and cabinet doors all count as obstructions. Measure the swing arc before you commit to a configuration, not after the unit arrives.

Which Way Should French Doors Open in a Cold Climate?

In a cold climate, French doors should open inward unless the opening sits under a covered porch or a deep roof overhang. Snow and ice accumulate against the exterior face of an outswing leaf and against the threshold, and a quarter inch of frozen slush is enough to stop an outswing door from opening at all.

Covered openings change the calculation. Builders working across Bend routinely specify outswing pairs where a covered patio, a deep eave, or a recessed entry keeps snow off the threshold, and they gain the interior floor space in exchange. The judgment call is whether the roof above the opening will actually keep the sill clear through a February storm.

How Wide Are French Doors?

French doors are most commonly 60 inches or 72 inches wide as a pair, with exterior configurations available from 36 inches up to 96 inches. A 72-inch pair splits into two 36-inch leaves, and a 60-inch pair splits into two 30-inch leaves. Those two widths cover the large majority of residential openings, which is why manufacturers stock them and why lead times run shortest on them.

Width selection follows the room rather than the catalog. Openings that need to pass furniture want 60 inches at minimum, and openings meant to function as a primary connection between an interior room and an outdoor living space usually justify 72 inches or wider. Custom widths are available from every manufacturer, at longer lead times.

Configuration	Common Unit Widths	Common Heights	Typical Rough Opening	Typical Application
Exterior pair, standard	60 in, 72 in	80 in	62 x 82.5 in, 74 x 82.5 in	Deck, patio, and garden access
Exterior pair, tall	72 in, 96 in	84 in, 96 in	74 x 86.5 in, 98 x 98.5 in	Great rooms and high-ceiling spaces
Pair with sidelites	96 in and up	80 in, 96 in	Varies by sidelite width	Formal entries and wide elevations
Interior pair	48 in, 60 in, 72 in	80 in, 84 in	50 x 82.5 in to 74 x 86.5 in	Studies, dining rooms, room dividers
Panel thickness	1-3/4 in exterior	1-9/16 in interior	Not applicable	Standard across most manufacturers

Sources: industry standard door sizing data; standard rough opening allowance of approximately 2 inches in width and 2.5 inches in height over the nominal unit size.

How Tall Are French Doors?

French doors are 80 inches tall in standard residential configurations, with 84-inch and 96-inch heights available for rooms with taller ceilings. The 80-inch height matches every other door in a conventionally framed house, which keeps head casing lines consistent across an elevation. Taller units read as a deliberate architectural choice and generally get specified alongside taller windows so the head heights align.

How Do You Measure French Doors?

You measure French doors by recording the rough opening rather than the existing door slab, working from inside the home. The rough opening is the framed void bounded by the header, the rough sill, and the king studs.

1. Measure the opening width from the inside face of one king stud to the inside face of the other, taking readings at the top, the middle, and the bottom.
2. Measure the opening height from the underside of the header to the subfloor, taking readings at the left, the center, and the right.
3. Record the smallest reading from each set to the nearest 1/8 inch, because a bowed stud or a deflected header will bind a unit sized to the largest reading.
4. Measure both diagonals of the opening and compare them, since a racked opening needs framing correction before a door goes in.
5. Measure the wall thickness from interior drywall face to exterior sheathing face, which determines the jamb depth and any jamb extension.
6. Confirm the swing clearance on the intended swing side, measuring out from the hinge jamb by the width of one leaf.

What Is the Rough Opening for French Doors?

The rough opening for French doors runs about 2 inches wider and 2.5 inches taller than the nominal unit size. A 72 by 80 inch pair needs a rough opening near 74 by 82.5 inches, and a 60 by 80 inch pair needs roughly 62 by 82.5 inches. That extra space exists so an installer can shim the frame plumb, level, and square independently of whatever the framing did over the previous decades.

What Are French Doors Made Of?

French doors are made of wood, aluminum-clad wood, fiberglass, vinyl, aluminum, and steel, and each material carries a different balance of thermal performance, maintenance, and structural stiffness. Material choice drives more of the finished performance than any other single decision, because the frame and the stiles govern how much heat moves through the assembly and how well the leaves hold their geometry over time.

• Wood: the traditional material and still the warmest interior finish available, with the widest range of stain and paint options. Wood delivers excellent natural insulating value and takes custom profiles that no other material matches. It rewards a maintenance schedule of periodic sealing on exposed exterior faces.
• Aluminum-clad wood: natural wood on the interior with an extruded aluminum exterior skin. This pairing gives the interior warmth of wood and an exterior surface that shrugs off UV, freeze-thaw cycling, and driven rain without refinishing. It is the premium configuration for exposed elevations.
• Fiberglass: dimensionally stable across wide temperature swings, which matters in high desert climates where a 40-degree daily range is routine. Fiberglass holds paint well, resists denting, and needs very little upkeep.
• Vinyl: strong thermal numbers relative to its cost, with a finish that needs no painting and no sealing. Vinyl performs well in moderate spans and is a dependable choice on value-driven builds.
• Aluminum: the strongest material per unit of section, which produces the narrowest sightlines and the largest glass area for a given opening. Thermally broken aluminum frames pair that slim profile with the insulating performance a heating climate requires.
• Steel: the stiffest option and the most resistant to forced entry, with a foam core that delivers solid insulating value. Steel suits security-forward and industrial-modern applications.

What Is the Best Material for Exterior French Doors in a Cold Climate?

The best materials for exterior French doors in a cold climate are aluminum-clad wood and fiberglass, because both hold their dimensions through repeated freeze-thaw cycling while delivering low heat transfer. Dimensional stability is the property that matters most in a heating climate. A leaf that swells and shrinks seasonally will bind against the astragal in one season and leak air in another, and a pair that shifts even 1/16 inch stops compressing its weatherstripping evenly. Thermally broken aluminum and well-built fiberglass doors both hold that geometry through a full seasonal cycle.

How Do You Insulate French Doors for Winter?

You insulate French doors for winter by specifying an insulated glass package with low-E coating, sealing the perimeter with compression weatherstripping, setting an adjustable threshold, and confirming the astragal seal compresses evenly along its full height. Those four items handle conduction through the glass and air leakage around the leaves, which together account for essentially all the heat a French door gives up.

Glass carries most of the load simply because it covers most of the panel. The U.S. Department of Energy attributes 25% to 30% of residential heating and cooling energy use to heat gain and heat loss through windows and glass doors, and a French door pair is a large expanse of glazing in an exterior wall. Getting the glass package right is the highest-leverage decision in the whole specification, which is why the U-factor on the NFRC label deserves attention before anything else.

How Do You Weatherstrip French Doors?

You weatherstrip French doors at four locations: the head jamb, both side jambs, the astragal where the leaves meet, and the threshold beneath each leaf. Compression weatherstripping in a kerf seals the jambs and head. The astragal carries its own bulb seal that the active leaf compresses when it latches. Thresholds on quality units are adjustable, meaning a set screw raises or lowers the sill cap so the sweep compresses correctly after the building settles. Adjustable thresholds are worth specifying, because a fixed threshold that loses contact after two seasons has no remedy short of replacement.

Are French Doors Energy Efficient?

Yes, modern French doors are energy efficient when specified with insulated low-E glazing and a thermally sound frame. ENERGY STAR reports that certified windows, doors, and skylights cut heating and cooling costs by an average of up to 13% nationwide compared with non-certified products, and ENERGY STAR certification in the Northern climate zone requires a U-factor of 0.30 or lower. The 2023 Oregon Residential Specialty Code, effective April 1, 2024, sets a prescriptive maximum U-factor of U-0.27 for Climate Zones 4 and 5, and the Oregon residential energy provisions require glass doors to meet window performance requirements. A French door specified to that threshold clears both the state code and the federal certification line.

How Do You Soundproof French Doors?

You soundproof French doors by specifying laminated glass, running continuous compression seals at every contact surface, and eliminating the air gaps that carry sound. Sound travels through air paths far more efficiently than through solid material, so a door pair with a 1/16 inch gap at the astragal transmits noise regardless of how thick the glazing is.

Laminated glass is the component that does the acoustic work. A laminated unit sandwiches a polyvinyl butyral interlayer between two glass plies, and that interlayer damps the vibration that ordinary glass passes straight through. Adding low-E glass coatings to a laminated build gives you thermal and acoustic performance in the same unit. Pair the glass with dual seals at the astragal, a properly adjusted threshold, and solid-core construction on interior applications, and the assembly performs measurably quieter than a standard glazed pair.

Are French Doors Secure?

Yes, French doors are secure when specified with a multipoint locking system, laminated or tempered glazing, reinforced strike plates, and hinges appropriate to the swing direction. Security on a French door is an engineering question rather than a category question. The configuration is only as strong as the locking hardware and the glass specification, and both are choices made at order time.

Doors deserve the attention because doors are where entry happens. FBI Uniform Crime Reporting data shows that 55.7% of burglaries involved forcible entry, 37.8% were unlawful entries without force, and 6.5% were attempted forcible entry, and Bureau of Justice data cited by ADT puts roughly 34% of entries at the front door. Timing matters as well: the FBI logged 216,601 daytime residential burglaries in 2024 against 174,053 nighttime, meaning most attempts happen while the house is empty.

How Do You Secure French Doors From Burglars?

You secure French doors from burglars with a multipoint lock, laminated glass, a reinforced strike, and a visible deterrent. Multipoint locking is the single largest improvement available. A multipoint system throws hooks or bolts at the head, the sill, and the mid-height of the leaf with one handle motion, distributing force across the frame instead of concentrating it at one strike plate. Choosing the right locks and hardware at specification time costs far less than retrofitting a finished door.

Laminated glazing closes the other path. Laminated glass holds together when struck because the interlayer bonds the fragments, so an intruder cannot clear the opening in one motion. Deterrence carries real weight too: a University of North Carolina at Charlotte survey of convicted burglars found that 83% check for an alarm system before attempting entry.

How Do You Reinforce French Doors That Open In?

You reinforce inswing French doors by upgrading the strike plate and the fasteners that hold it. Standard strike plates ship with 3/4 inch screws that bite only into the jamb casing, and 3-inch screws driven through the jamb into the king stud transfer force into framing instead. Add heavy-duty flush bolts on the inactive leaf that seat deep into the header and the subfloor, and specify a Grade 1 deadbolt under the ANSI/BHMA grading standard, which is the highest security grade available.

How Do You Secure French Doors That Open Out?

You secure outswing French doors with security hinges that use non-removable pins or set screws. Outswing hinges mount with their barrels on the exterior face, which puts the pins within reach of anyone standing at the door. Non-removable pin hinges eliminate that path. Hinge-side security studs offer a second layer, seating a fixed pin from the hinge leaf into a matching hole in the jamb so the leaf stays captured even if the pins come out entirely.

Do French Doors Need Tempered Glass?

Yes, French doors need safety glazing, which means tempered or laminated glass. Section R308.4.1 of the International Residential Code classifies glazing in fixed and operable panels of swinging, sliding, and bifold doors as a hazardous location, and hazardous locations require safety glazing. Section R308.1 requires each pane to carry a permanent designation that is acid etched, sandblasted, ceramic fired, laser etched, or embossed, and visible in the finished installation. Any French door built by a reputable manufacturer ships with compliant glazing already specified.

How Do You Cover French Doors for Privacy?

You cover French doors for privacy with blinds sealed between the glass panes, obscure or textured glazing specified at order time, grille patterns that break up the sightline, or fabric treatments mounted to the frame. Between-glass blinds are the option most homeowners settle on, because the slats sit inside the sealed unit where they collect no dust and never interfere with the swing.

Obscure glazing solves privacy permanently and gets decided at order time rather than after installation. Reeded, rain, satin-etched, and frosted patterns all pass daylight while blocking the view, and they suit bathrooms, home offices, and street-facing elevations where a clear pane would be uncomfortable. Grille patterns work differently, breaking the glass into smaller lites so the eye reads a pattern rather than a scene. Fabric treatments remain the most flexible route, provided the rod mounts high enough and wide enough that the panels stack clear of the swing arc.

Can You Put Screens on French Doors?

Yes, you can put screens on French doors, using retractable screens that roll into a cassette at the jamb or hinged screen doors mounted to the exterior casing. Retractable screens are the common answer on inswing pairs, because the mesh disappears into a housing when nobody needs it and the cassette adds only a narrow band at each jamb.

Outswing pairs complicate the picture, since the leaves occupy the exterior face where a screen would normally mount. Retractable screens installed on the interior side solve that conflict and keep the swing arc clear. Screen planning belongs in the original order rather than a later trip to a home center, because the casing depth and the jamb reveal determine which screen systems will physically mount. Our hinged patio doors can be specified with screen compatibility built into the frame detail from the start.

What Are the Pros and Cons of French Doors?

The pros of French doors are abundant natural light, a full-width unobstructed opening, symmetrical proportions that suit both traditional and modern architecture, flexible daily operation from one leaf, and strong resale appeal. The considerations to plan around are swing clearance, the larger glazed area, and the hardware coordination that two operable leaves require.

• Daylight: a French door pair delivers glass across nearly the entire opening, which brightens rooms that a solid door leaves dim.
• Full-width access: opening both leaves clears the entire span with no center post, which matters for furniture, entertaining, and indoor-outdoor flow.
• Daily flexibility: one leaf handles routine traffic while the other stays bolted, so the pair behaves like a single door most of the time.
• Architectural fit: the symmetrical proportion reads correctly on farmhouse, craftsman, contemporary, and mountain-modern elevations alike.
• Swing clearance to plan: each leaf needs floor space equal to its own width, so the furniture plan and the door plan need to be drawn together.
• Glass package to specify: the large glazed area makes the U-factor, the low-E coating, and the laminated build more consequential than on a solid door.
• Hardware to coordinate: two operable leaves need a multipoint lock, flush bolts, an astragal seal, and hold-open hardware chosen as one package.

Can French Doors Be Used as Interior Doors?

Yes, French doors are widely used as interior doors, most often between a living area and a study, a dining room, or a home office. Interior units are built lighter at 1-9/16 inches thick rather than the 1-3/4 inches standard on exterior panels, and they carry no weatherstripping or threshold. Interior pairs solve a specific design problem, which is separating a room acoustically while keeping it connected visually. Unlike exterior entry doors, interior pairs need no thermal package, so the specification centers on the glass pattern and the hardware finish.

What Is the Best Alternative to French Doors?

The best alternative to French doors is a sliding patio door when floor clearance is tight, a multi-slide door when the opening is wider than 8 feet, or a folding glass wall system when the goal is removing the wall entirely. Each alternative solves a constraint the hinged pair cannot, and the right answer depends on which constraint is binding.

Sliding units are the direct substitute where swing clearance is unavailable. Panels travel on a track rather than an arc, consuming zero floor space on either side, which makes them the practical answer in narrow rooms, along tight deck edges, and in any layout where furniture has to sit close to the opening. Comparing sliding patio doors against a hinged pair usually comes down to that single measurement.

Wider openings call for a different family of products. Once an opening passes 8 feet, multi-slide doors stack three or more panels to one side or pocket them into the wall, producing spans a hinged pair cannot reach. Folding systems fold panels accordion-style against the jamb and clear nearly the whole opening. Pivot doors offer a third path for single-panel statement entries where the visual weight matters more than the span.

Are French Doors in Style in 2026?

Yes, French doors are in style in 2026, and the current specification trends run toward dark frame finishes, taller units, narrower sightlines, and full-lite glazing with minimal grille work. Black and bronze exteriors have moved from an accent choice to a default on contemporary and mountain-modern elevations, and matte finishes now outsell gloss across most product lines.

Proportion is where the biggest shift shows. Eighty-inch units still dominate replacement work, but new construction increasingly specifies 96-inch heights so the door head aligns with taller window heads across the elevation. Narrow stiles and rails support the same goal, pushing more glass into the same opening. Full-lite glazing with no grilles reads cleanest on modern designs, while simulated divided lites remain the choice on traditional and farmhouse elevations. On the widest openings, glass wall systems now sit alongside French doors on the same elevation, with the hinged pair handling daily traffic and the larger system opening for entertaining.

What Do Central Oregon Builders Prefer in French Doors?

Central Oregon builders prefer aluminum-clad wood and fiberglass French doors, specified with insulated low-E glazing at U-0.27 or lower, multipoint locking hardware, and adjustable thresholds. That specification reflects the climate directly. High desert conditions cycle through wide daily temperature swings and long heating seasons, which rewards materials that hold their dimensions and glass packages that hold heat.

Swing direction gets decided opening by opening rather than by rule. We see inswing specified on exposed elevations where snow reaches the threshold, and outswing specified under covered patios and deep eaves where the roof keeps the sill clear and the interior floor space is worth reclaiming. Head heights get coordinated with the window package on the same elevation so the sightlines align, and hardware finishes get matched across doors and windows in one order. Builders working with us on custom patio doors typically settle the frame material, the glass package, the swing, and the hardware in a single consultation, which keeps the whole elevation consistent and the lead times aligned.

How Do You Adjust and Level French Doors After Installation?

You adjust and level French doors by working through the frame, the hinges, and the threshold in that order. Doors that bind, drag, or show an uneven reveal at the astragal are almost always telling you something about the frame rather than the leaves.

1. Check the frame first, running a level on both side jambs and the head to confirm the frame is plumb and level before touching any hardware.
2. Measure the reveal gap along the astragal from top to bottom, since a gap that tapers means one leaf hangs out of plumb.
3. Adjust the hinges on the leaf that hangs low, tightening the screws into the framing or shimming behind the hinge leaf to shift the panel.
4. Verify that both leaves close without contacting the astragal before latching, which confirms the panels sit in the same plane.
5. Set the adjustable threshold with the set screws so the sweep compresses evenly along the full width of each leaf.
6. Test the multipoint lock through a full cycle, confirming every hook and bolt engages its keeper without forcing the handle.

Frequently Asked Questions

How Do You Unlock French Doors?

You unlock French doors by turning the deadbolt or key on the active leaf, then lifting the handle to retract the multipoint hooks if the unit uses a multipoint system. Opening the inactive leaf takes a second step, releasing the flush bolts at the head and the sill. Those bolts are usually recessed levers on the inside edge of the leaf.

How Do You Open French Doors Fully?

You open French doors fully by unlatching the active leaf first, then releasing the flush bolts on the inactive leaf so both panels swing free. Full opening clears the entire span with no center post. Confirm the swing arc is clear of furniture before releasing the second leaf, since a glazed panel swinging into an obstruction can crack the glass or spring a hinge.

How Do You Install French Doors?

You install French doors by setting the pre-hung unit into a squared rough opening, shimming the frame plumb and level at every hinge location, fastening through the shims into the framing, then flashing and sealing the exterior perimeter. Exterior installation is the point at which most performance problems originate, so the flashing sequence and the sill pan deserve as much attention as the door itself.

Are French Doors Safe for Homes With Young Children?

Yes, French doors are safe for homes with young children, because building code already requires the glazing to be tempered or laminated safety glass. Safety glazing breaks into blunt fragments or holds together on an interlayer rather than producing sharp shards. Families often add applied decals at child height so the glass stays visible, and hold-open hardware prevents leaves from swinging shut unexpectedly.

How Do You Decorate French Doors?

You decorate French doors by matching the hardware finish to the room’s other metals, choosing a grille pattern that echoes the window package, and mounting any fabric treatment high and wide enough to clear the swing. Restraint reads best on a glazed pair, since the glass and the frame proportion are already doing the visual work.

How Long Do French Doors Take to Order?

French doors typically take 6 to 12 weeks to arrive after ordering, because door units are built to order rather than pulled from stock. Custom sizes, specialty finishes, and non-standard glass packages sit at the longer end of that window. Standard 60-inch and 72-inch pairs in common finishes move fastest, which is worth knowing when a schedule is tight.

The Bottom Line

A French door is a pair of side-hinged glazed leaves that open independently and clear the full width with no center post, a design that has done the same job since 17th century France: bringing daylight through an opening people can also walk through. Everything that determines how well a given pair performs gets decided before the unit is built. Frame material sets the thermal baseline and the dimensional stability. The glass package sets the U-factor, the acoustic performance, and the forced-entry resistance. Swing direction sets the clearance envelope and the snow behavior. Hardware ties the two leaves into one weathertight assembly.

Those four decisions are worth making together rather than one at a time, because a premium frame with a mismatched glass package underperforms a modest frame specified correctly. If you are working through a door package and want a second opinion on the material, the swing, or the glazing, the team at Lifetime Building Supply works with builders and homeowners across Central Oregon every week, and we are glad to walk an opening with you before anything gets ordered. Reach out any time to get a quote.