What 29 x 80 Means for Your Project
A 29 x 80 interior door is a door slab or pre-hung unit sized 29 inches wide by 80 inches tall. The 80-inch figure is one of the most common interior door heights in North American and export residential construction, and 29 inches sits in the narrow end of the width family that also includes 16, 23 3/4, 33, 34, 36, 38, 40, and 42 inches. For a B2B buyer, the practical meaning is straightforward: you are specifying a narrow, full-height interior door for openings where a standard 32- or 36-inch door would be too wide for the available wall space or the intended function.
What matters more than the label is the difference between nominal and actual dimensions. A “29 x 80” door is not necessarily 29.000 inches wide when it arrives. Most manufacturers treat the nominal figure as the target size, then subtract for edge clearances, hinge and latch allowances, and the undersize trimming that installers expect. If you are ordering in bulk and the doors must fit a fixed frame, confirm the actual slab dimensions before the purchase order is issued — not after the container has shipped.
This guide compares the full 80-inch width family, explains rough opening requirements, covers material and core options, and lays out the procurement factors that determine cost and lead time for project-scale orders.
Understanding Interior Door Sizes: 29 x 80 in Context
Nominal vs actual dimensions
Nominal size is the trade name; actual size is what you measure with a tape. For interior doors, the gap between the two comes from several sources:
- Edge clearance. A door slab is typically made slightly undersized so it can swing freely once the frame is installed. A slab sold as 29 inches wide may measure closer to 28 3/4 to 28 7/8 inches depending on the manufacturer’s tolerance.
- Height trimming. An 80-inch nominal height is often supplied at roughly 79 1/2 to 79 7/8 inches so the installer can trim the bottom for floor clearance and level tolerances.
- Pre-hung vs slab. A pre-hung unit’s outer frame dimension is larger than the slab. A 29 x 80 slab is not the same as a 29 x 80 pre-hung assembly — the frame adds width and height.
Because tolerances vary by factory, region, and product line, treat any single number as a manufacturer specification, not a universal constant. When you are sourcing from overseas, ask for the actual slab and frame dimensions in writing rather than relying on the nominal label.
How 29 x 80 fits the standard sizing system
Interior door widths cluster around a few functional bands. Doors in the 16- to 24-inch range serve closets, linen storage, and small utility spaces. The 28- to 32-inch band covers bathrooms, laundry rooms, and secondary bedrooms. The 34- to 38-inch band is the mainstream for primary bedrooms, offices, and general circulation, with 36 inches being the most widely used residential interior width. Doors of 40 to 42 inches appear in accessible, commercial, and wide-opening applications.
A 29 x 80 door sits in the narrow functional band. It is a deliberate choice, not a default. Buyers usually select it because the wall segment, plumbing layout, or adjacent fixture does not allow a wider swing, or because the room behind it is small enough that a wider door would consume usable space.
Measuring for a 29 x 80 opening
Measure the opening in three places — top, middle, and bottom for width; left, middle, and right for height — and use the smallest reading. Measure the jamb depth as well, since it determines the wall thickness the frame must match. If the opening is out of square, the door must be sized to the tightest point, not the average.
Common mistakes in project measurement include measuring the old door instead of the rough opening, ignoring floor thickness when the finished floor is not yet installed, and assuming the frame is plumb. Each of these leads to a door that will not close or will not seal, and re-ordering a custom size mid-project is far more expensive than a second measurement pass.
Width-by-Width Comparison: 16 to 42 Inches at 80 Inches Tall
The table below compares the common 80-inch interior door widths by typical application and availability. Availability is not universal — narrow and very wide sizes are more often made to order, while mainstream widths are more likely to be stocked.
| Nominal Width | Typical Application | Availability Notes |
|---|---|---|
| 16 x 80 | Small linen, utility, mechanical closets | Usually custom or limited stock |
| 23 3/4 x 80 | Narrow closets, powder rooms, tight storage | Often made to order; less common as stock |
| 29 x 80 | Bathrooms, laundry, secondary bedrooms, narrow circulation | Custom or semi-custom in most export programs |
| 33 x 80 | Bathrooms, small bedrooms, offices | Reasonably common; often stocked regionally |
| 34 x 80 | Bedrooms, offices, general interior circulation | Widely available; mainstream size |
| 36 x 80 | Primary bedrooms, main interior doors | The most common residential interior width |
| 38 x 80 | Wider bedrooms, accessible circulation, larger openings | Available; sometimes made to order |
| 40 x 80 | Accessible routes, commercial interiors, wide openings | Less common; often specified rather than stocked |
| 42 x 80 | Accessible and commercial openings, wide passages | Usually made to order; confirm code requirements |
A few practical points sit behind this table. The 29-inch width is close enough to 30 inches that some buyers assume they are interchangeable — they are not, and a door sized for one will not fit a frame built for the other without adjustment. The 23 3/4-inch width is a common closet size that looks similar to 24 inches but is specified separately. At the wide end, 40- and 42-inch doors are frequently tied to accessibility requirements, which are governed by local building codes and should always be verified for the specific project jurisdiction rather than assumed.
29 x 80 vs 34 x 80: what actually changes
The five-inch difference between a 29 x 80 and a 34 x 80 interior door is more than a number. A 34-inch door is the mainstream choice for bedrooms and general circulation because it accommodates furniture movement and feels proportionate in a normal room. A 29-inch door is a compromise driven by space constraints. In a comparison of the two, the 34 x 80 wins on circulation and resale familiarity; the 29 x 80 wins where a wider swing would block a fixture, conflict with an adjacent door, or reduce usable floor area. Neither is “better” in the abstract — the right answer depends on the wall and the room function.
Choosing between 36 by 80 and 38 x 80
The 36 by 80 interior door is the default for primary bedrooms and main interior passages. The 38 x 80 interior door is a step up used when the opening is wider, when the project wants a more generous feel, or when circulation requirements favor additional clearance. If the framing already accommodates 38 inches and the budget allows, the wider door is the more comfortable choice. If the framing is set at 36 inches, forcing a 38-inch door means reframing, which is rarely worth the cost. Decide based on the rough opening you actually have, not the width you would prefer.
Material and Core Options for 80-Inch Interior Doors
Material and core choice affects weight, acoustics, durability, and — importantly for procurement — which sizes are practical to produce.
Solid wood doors offer the best acoustic performance and the most substantial feel. They are heavier, which means hinges and frames must be specified accordingly, and they are more sensitive to humidity variation. Solid wood is available in custom widths including 29 x 80, but the higher material cost makes it most common in higher-end residential and hospitality projects.
Hollow core doors use a lightweight internal grid with a veneer or molded skin. They are the most economical option and are widely used in apartments, hotels, and volume residential construction. Hollow core is easiest to produce in standard widths, so a 29 x 80 hollow core door may be a stock or semi-custom item rather than a fully bespoke one.
Solid core doors fill the interior with a dense composite or particle core. They sit between hollow and solid wood on cost and performance, offering better sound reduction and a more solid feel than hollow core without the weight and cost of solid timber.
Engineered and composite constructions combine a stable core with a decorative skin. They resist warping better than solid wood in fluctuating climates, which matters for export shipments crossing humidity zones.
The size implication is direct: heavier cores require stronger frames and more robust hinge preparation, and very narrow or very wide doors in heavy cores are more likely to be made to order. When specifying a 29 x 80 door in solid wood, confirm the hinge and frame specification at the same time as the slab size.
Custom Sizing and Bulk Order Considerations
When 29 x 80 is the right call — and when to go custom
A 29 x 80 door is appropriate when the opening is genuinely narrow, when an adjacent fixture or wall limits the swing, or when the room is small enough that a wider door would be impractical. It is the wrong call when the only reason for choosing it is that a 30-inch door was unavailable or that the framing was built slightly off. In those cases, correcting the framing or ordering a true custom width is usually the better decision, because a door that is functionally too narrow for its room will be a long-term complaint.
For projects with repeated non-standard openings, a custom width program is often more economical than mixing stock sizes. Producing a consistent custom width across many units spreads the setup cost and simplifies installation.
Cost factors across widths and materials
Door cost is driven by more than width. The main variables are:
- Core material. Hollow core is the lowest cost; solid wood is the highest.
- Width. Very narrow and very wide doors fall outside high-volume production lines, so per-unit cost rises.
- Finish. Pre-finished doors cost more than unfinished but reduce on-site labor.
- Hardware preparation. Custom hinge and latch positions add cost.
- Order volume. Larger volumes reduce per-unit cost; small mixed orders do not.
A 29 x 80 door in hollow core is typically a modest premium over a stock 32-inch door because it is a non-standard width. The same size in solid wood carries a larger premium. Buyers comparing value should weigh the door cost against the cost of adjusting the opening, since a slightly wider stock door plus minor framing work is sometimes cheaper than a custom narrow door.
Procurement Guide: Lead Times, MOQ, and Logistics
For B2B buyers sourcing interior doors internationally, the procurement checklist matters as much as the door specification.
Confirm actual dimensions in writing. Ask for the slab width, slab height, thickness, and frame dimensions before ordering. Do not accept the nominal size alone.
Establish the rough opening tolerance. Provide the opening dimensions and let the supplier confirm the required door size, rather than ordering to a nominal figure and hoping it fits.
Clarify MOQ. Minimum order quantities vary by supplier and by whether the size is stock, semi-custom, or fully custom. Custom widths generally carry a higher MOQ than standard widths.
Verify documentation. For import orders, confirm the supplier can provide a packing list, proforma invoice, and full customs documentation. Missing paperwork delays clearance.
Plan lead time around production plus transit. Total lead time is production time plus shipping time, and ocean freight adds weeks. Build this into the project schedule rather than ordering against the installation date.
Choose the shipping mode deliberately. FCL (full container load) suits large uniform orders and reduces handling. LCL (less than container load) suits smaller or mixed orders but adds consolidation time.
Inspect before shipment. Air-tightness, water-tightness, and wind resistance testing are more commonly associated with exterior products, but pre-shipment inspection of dimensions, finish, and hardware preparation is equally important for interior doors in a bulk order.
Where we fit into this process
The standards above — confirmed actual dimensions, documented tolerances, clear MOQ terms, and complete export paperwork — are what separate a smooth bulk order from a costly rework. As a manufacturer, our approach to this is to supply directly from our factory, which removes middleman markup and keeps the specification conversation between the buyer and the production floor. We offer full customization on size, color, glass, and hardware accessories, so a 29 x 80 interior door can be produced to your project’s actual dimensions rather than rounded to the nearest stock size. Our profile structure and fittings can be adjusted to match the building codes of the target market, and we provide packing lists, proforma invoices, and full customs documents for both FCL and LCL shipments. Every order goes through pre-shipment inspection covering air-tightness, water-tightness, and wind resistance, alongside dimensional and finish checks. If you are comparing widths or need a quote for a custom size, you can Talk to Our Team directly.
To compare door sizes in more detail, see our door size guide, and for project pricing, Get a Quote for your specific widths and volumes.
Common questions buyers ask
What are the actual dimensions of a 29 x 80 interior door? The nominal size is 29 inches wide by 80 inches tall. The actual slab is typically slightly smaller — often around 28 3/4 to 28 7/8 inches wide and 79 1/2 to 79 7/8 inches tall — to allow for clearance and trimming. Always confirm actual dimensions with the supplier.
What is the difference between 29 x 80 and 34 x 80 interior doors? The 34 x 80 is wider by five inches and is the mainstream choice for bedrooms and general circulation. The 29 x 80 is a narrow door used where the opening or room function does not allow a wider swing.
Can I get a 29 x 80 interior door in solid wood or custom finishes? Yes. Solid wood, hollow core, and solid core are all available in custom widths, and finishes can be specified. Solid wood in a narrow width is more likely to be a made-to-order item, so confirm lead time and MOQ.
What is the rough opening required for a 29 x 80 door? As general guidance, the rough opening is slightly larger than the door or pre-hung frame to allow for shimming and adjustment — commonly around two inches wider and two to two and a half inches taller than the door slab, depending on the frame type. Because this varies with framing and jamb construction, confirm the exact figure with your supplier and verify against local practice.
Are 80-inch interior doors standard in commercial buildings? The 80-inch height is common in both residential and commercial interiors, but commercial projects often specify wider widths and may be subject to accessibility codes. Verify width requirements against the local code for the specific project.
How do I choose between 36 by 80 and 38 x 80 interior doors? Base the decision on the rough opening you actually have. If the framing accommodates 38 inches and the budget allows, the wider door offers more comfortable circulation. If the framing is set at 36 inches, reframing for a 38-inch door is rarely worth the cost.
What is the minimum order quantity for custom 29 x 80 doors? MOQ depends on the supplier and on whether the size is stock, semi-custom, or fully custom. Custom widths generally require a higher MOQ than standard widths. Confirm the MOQ in writing before committing to a project schedule.
How long does shipping take for bulk interior door orders from China? Total lead time combines production time and ocean transit time. Production schedules vary by order size and customization, and ocean freight adds several weeks depending on destination port. Plan the order against the installation date with buffer, and confirm the shipping mode — FCL or LCL — at the quotation stage.
