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Interior Doors

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Interior doors look like the least regulated thing in a house, and two federal rules say otherwise. The CPSC's architectural glazing standard defines a door as an assembly installed in an interior or exterior wall, movable in a sliding, pivoting, hinged or revolving manner and used to produce or close off an opening for human passage, so the glass in an interior French door sits inside the same standard as the glass in your entry door. Bathtub doors and enclosures and shower doors and enclosures are named separately and fall into the standard's more demanding Category II.

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The second rule is about what the door is made of. Most interior doors in the United States are built from composite wood, and the EPA's formaldehyde emission standards under Title VI of the Toxic Substances Control Act cover hardwood plywood, medium-density fiberboard and particleboard, along with the finished goods that contain them. Since March 2019 those products must be labeled as TSCA Title VI compliant.

Then there is age. Painted doors and jambs are friction surfaces, and in housing built before 1978 disturbing that paint is covered work under the EPA's lead rule. This guide covers the door types American builders use, composite wood and its labeling, the glazing rules that reach indoors, the lead rule and licensing, the federal requirements that apply inside a HUD-code manufactured home, how a replacement runs, finishing, and what drives a quote.

Interior door types used in American homes

  • Hinged panel and flush doors: the default throughout the house, sold as a bare slab or as a prehung unit already mounted in its own jamb.
  • Hollow-core doors: light skins over a lattice core, inexpensive and easy to hang, but they carry little sound and dent rather than dish when something hits them.
  • Solid-core doors: a dense composite core faced with veneer or moulded skin, noticeably quieter and heavier, which is why hinge and jamb quality starts to matter.
  • Solid wood doors: stile-and-rail construction that can be repaired almost indefinitely and that moves with seasonal humidity, so every edge has to be sealed.
  • Pocket doors: the slab disappears into the wall, freeing floor area in baths and tight halls, at the cost of a frame built inside the wall and weaker sound control.
  • Barn doors: the slab slides on an exposed rail across the face of the wall, which needs clear wall beside the opening and never seals at the edges.
  • Bifold and closet doors: folding or sliding panels on a head track, the least demanding to fit and the first to go out of adjustment.
  • Interior French and glazed doors: two leaves or one with glass panes, which brings them inside the federal glazing standard's definition of a door.

Composite wood, formaldehyde standards and the TSCA Title VI label

Nearly every mass-produced interior door has composite wood inside it, and that puts it inside a federal emissions rule. EPA's regulation at 40 CFR part 770 contains formaldehyde emission standards, testing and certification provisions for the manufacture, distribution and sale of composite wood products, the component parts that contain them and the finished goods that contain them. The products covered are hardwood plywood, medium-density fiberboard and particleboard, and the agency states that after March 22, 2019 composite wood products must be labeled as TSCA Title VI compliant.

The labeling requirement is specific enough to be checked. Panels or bundles must carry the panel producer's name, the lot number, the number of the third-party certifier and a statement that the products are TSCA Title VI certified. Fabricators of finished goods must label every finished good they produce, or every box or bundle, with at minimum the fabricator's name, the date of production in month and year format and a statement that the goods are TSCA Title VI compliant, and importers, distributors and retailers must leave those labels intact. There is a de minimis exception for a finished good whose regulated composite wood content does not exceed 144 square inches based on the surface area of its largest face, which is far smaller than any door.

One point protects the trade rather than the homeowner, and it is useful to understand. The rule states that persons or entities in the construction trades are not fabricators by renovating or remodeling buildings, and are not retailers by selling, renovating or remodeling buildings. The carpenter hanging your doors is not the party required to label them; the label belongs on the product, so ask to see it on what is delivered rather than expecting the installer to produce one.

Glass indoors: French doors, shower enclosures and what the federal standard covers

The CPSC standard is often assumed to be about exterior openings, and its own definitions say otherwise. A door, for the purposes of 16 CFR part 1201, is an assembly installed in an interior or exterior wall used as a means of human passage, so an interior glazed door is a covered product. Which test category applies depends on the glass: doors containing no single piece of glazing material greater than 9 square feet on one side are Category I, while doors containing any piece greater than that are Category II, together with shower doors and enclosures and bathtub doors and enclosures.

Bathrooms are where this matters most, because the enclosure is regulated directly. Shower doors and enclosures are defined as assemblies of one or more panels forming all or part of the wall or door of a shower stall, and bathtub doors and enclosures as assemblies installed on the lip of or immediately surrounding a bathtub. Both sit in Category II. The Commission has also issued an interpretation resolving an obvious ambiguity: it did not intend the standard to apply to glazing material in a window located over a bathtub or within a shower stall and in the exterior wall of a building, and confirms that the standard does not apply to such windows. That is a statement about this federal standard only, and says nothing about what the residential code adopted where you live requires in that location.

Two exemptions come up in older houses. The louvers of jalousie doors are exempt, and so are openings in doors through which a 3 inch diameter sphere is unable to pass, which is why small divided lites in an old interior door are treated differently from a single large pane. If you are replacing glass rather than the whole door, ask the glazier which category the assembly falls into and confirm the pane carries a permanent label.

Lead-safe rules for pre-1978 interiors, licensing, and the door to an attached garage

Interior door work concentrates on exactly the surfaces the EPA's lead rule was written about. The Renovation, Repair and Painting rule applies to work in houses, apartments and child-occupied facilities built before 1978, and in general anyone paid to perform work that disturbs paint in that housing must be certified, with carpentry among the covered activities and firms barred from advertising or performing covered work without firm certification. The minor repair and maintenance exemption covers activities disturbing six square feet or less of paint per room inside, but the EPA notes that demolition of painted surfaces is always covered regardless of square footage, and taking out a painted door with its casing can move past that line quickly.

Paint testing is not required by the rule. What the EPA says is that unless you have documentation that the paint is not lead-based, the requirements apply, and that testing, if done, must be done by the appropriate qualified professional: EPA-recognized test kits by certified renovators, X-ray fluorescence instruments by certified inspectors or risk assessors. Firm certifications are good for five years, and several states administer their own authorized programs in place of the federal one.

Licensing is a state question, and for interior carpentry California names it directly: the C-6 cabinet, millwork and finish carpentry classification covers a contractor who makes cabinets, cases, sashes, doors, trims, nonbearing partitions and other items of finish carpentry, and who places, erects and finishes such cabinets and millwork in structures. Oregon generally requires anyone working for compensation in a construction activity involving improvements to real property to be licensed, and lists carpentry as an example. Washington requires registration with Labor and Industries plus a bond and insurance. Texas licenses no residential carpentry trade of this kind at all. One interior door is not like the others, though: the door between an attached garage and the living space is governed by the residential code your jurisdiction adopted, along with any landing or threshold requirements, so ask the building department what that door has to be before you buy a slab to match the rest of the hall.

Inside a HUD-code manufactured home, interior doors follow federal rules

A manufactured home built to HUD's standards is not governed by the local building code in the way a site-built house is, and the federal standard reaches all the way to the interior hardware. If you live in one, these requirements are the specification any replacement has to satisfy, so say so before ordering.

  • Interior swinging doors must have a minimum clear opening of 27 inches, except doors to toilet compartments in single-section homes and doors to closets and pantries.
  • Interior doors with passage hardware and no privacy lock, or with a privacy lock not engaged, must open from either side by a single movement of the hardware in any direction.
  • Every privacy lock must have an emergency release on the outside so the room can be entered when the lock has been engaged from inside by a knob, lever or button.
  • Bathroom and toilet compartment doors are required to be equipped with a privacy lock.
  • A required egress door may not be located in a room that can only be left by passing through a lockable interior door, which constrains where a lockable door can be added.
  • Because one required exit door must be reachable from each bedroom doorway within 35 feet of travel, any change to interior layout or door swing should be checked against that path.

How interior doors get replaced: prehung units, slabs and the order of work

  • The existing jamb is checked first for square, plumb and depth, because that is what decides whether a slab can be used or a prehung unit is needed.
  • Slab replacement keeps the existing casing and jamb, and requires hinge mortises and the lock bore to match the old positions exactly.
  • A prehung unit replaces the frame as well, which means casing comes off and goes back or is replaced, and the jamb width has to match the wall thickness.
  • Swing and handing are confirmed at each opening, including which way the door rests against a wall and whether it blocks a switch, a register or a closet.
  • Floor finish is accounted for: new flooring, a thick pad or an added threshold can leave a slab dragging that used to clear.
  • Hardware is specified before ordering, since a door bored for a standard lockset is not ready for a mortise lock or a specific privacy set.
  • In pre-1978 housing, containment and cleanup are part of each working day rather than an end-of-project tidy.
  • Every door is operated, latched and, where fitted, locked before the job is called finished, and doors are left to cure before being closed against fresh paint.

Finishing and looking after interior doors

  • Seal the top and bottom edges as well as the faces, since those are the edges nobody sees and the ones that absorb moisture in a bath or laundry.
  • Use a finish made for doors and trim that stands up to hands and cleaning, and let it cure before the door is closed against the stops.
  • Tighten hinge screws before a door drops, and replace one screw per hinge with a longer one that reaches the framing behind the jamb.
  • Adjust the strike rather than forcing a latch, because a bolt landing on the plate wears out hardware that is otherwise fine.
  • Keep paint off latch bolts, hinge knuckles and privacy-lock releases, which is the most common way working hardware is disabled during a repaint.
  • Clean and lubricate pocket and bifold track on a schedule, since those systems fail from debris long before they fail from wear.
  • In a home with young children, know how the privacy locks release from outside before you need to, and keep the release tool where an adult can find it.

What an interior door quote turns on, and how LokalMatch fits in

Interior door work is priced by the opening, and the openings are rarely identical. A slab into a sound jamb and a prehung unit with new casing are different amounts of carpentry. Solid-core doors weigh more and ask more of hinges and jambs. Pocket and barn conversions involve wall work rather than door work. Painting or staining on site adds days that have nothing to do with the doors themselves. A house built before 1978 adds containment and cleanup to every opening that has painted trim, and older homes often have jambs that are out of square, which is real work rather than an upsell.

The fair way to compare bids is to hold the scope constant: the same number of openings, the same core construction, the same hardware, prehung or slab stated per opening, casing included or not, finishing included or not, and disposal of the old doors settled.

LokalMatch is the introduction only. You describe the interior door job once, including how many openings, whether you want prehung units or slabs, and the approximate age of the house, and door installers and finish carpenters working in your area get in touch with you. Carpenters and installers pay LokalMatch for each request they take on. LokalMatch does not install doors, does not set prices, and does not vet, rank or recommend anyone, so checking state licensing, insurance and lead-safe certification where it applies remains your step.

Interior Doors: frequently asked questions

Does the glass in an interior French door have to be safety glazing?

The federal standard reaches it. 16 CFR part 1201 defines a door as an assembly installed in an interior or exterior wall used as a means of human passage, so an interior glazed door is a covered product, and its category depends on the glass: no single piece greater than 9 square feet makes it Category I, any piece greater than that makes it Category II. Small divided lites can fall under the exemption for openings a 3 inch diameter sphere cannot pass through, so ask the supplier which applies.

What is the TSCA Title VI label on a new door?

It is the EPA's formaldehyde compliance marking for composite wood. The rule at 40 CFR part 770 covers hardwood plywood, medium-density fiberboard and particleboard and the finished goods containing them, and since March 22, 2019 those products must be labeled as TSCA Title VI compliant. On a finished good the label must show at least the fabricator's name, the production date in month and year form, and a statement that the good is TSCA Title VI compliant. Importers, distributors and retailers must leave it intact, so look for it on delivery.

Do lead rules really apply to swapping interior doors?

In pre-1978 housing, for paid work, yes. The EPA's rule applies to houses, apartments and child-occupied facilities built before 1978, and anyone paid to disturb paint there must be certified, with carpentry listed among covered activities. The minor repair exemption covers six square feet or less of paint per room inside, but demolition of painted surfaces is always covered regardless of area. Without documentation that the paint is not lead-based, the requirements apply, so ask for the firm's certification before work starts.

Is the door from an attached garage into the house an ordinary interior door?

No, and it should not be bought to match the hallway. That opening is governed by the residential code your state adopted and your jurisdiction enforces, which sets what the door there has to be. The requirements differ by jurisdiction because codes are amended on adoption, so ask your building department what applies at your address, and have the door specified from that answer rather than from a showroom.

My home is a manufactured home. Can I replace interior doors freely?

Within federal limits. HUD's standards require interior swinging doors to give a minimum clear opening of 27 inches, except doors to toilet compartments in single-section homes and to closets and pantries; require passage hardware to open from either side with a single movement when no privacy lock is engaged; require every privacy lock to have an emergency release on the outside; and require bathroom and toilet compartment doors to have a privacy lock. Keep the escape path from each bedroom in mind before changing swings.

How does LokalMatch work for interior doors?

You describe the job once, with your ZIP code, the number of openings, whether you want prehung units or slabs and whether finishing is included, and installers and finish carpenters serving your area contact you directly. Those carpenters pay LokalMatch for each request they take. LokalMatch does not hang doors, does not set or estimate prices, and does not vet, rank or recommend any of the companies that respond.

Sources

  1. 16 CFR part 1201, Safety Standard for Architectural Glazing Materials: definition of a door, product categories and the bathtub and shower interpretation — U.S. Government Publishing Office
  2. 40 CFR part 770, Formaldehyde Standards for Composite Wood Products: applicability and labeling — U.S. Government Publishing Office
  3. Formaldehyde Emission Standards for Composite Wood Products — U.S. Environmental Protection Agency
  4. Renovation, Repair and Painting Program: Contractors, covered activities and paint testing — U.S. Environmental Protection Agency
  5. Renovation, Repair and Painting Program: firm certification and EPA-authorized state programs — U.S. Environmental Protection Agency
  6. C-6 Cabinet, Millwork and Finish Carpentry Contractor classification — California Contractors State License Board
  7. Do you need a license? Construction work requiring a CCB license — Oregon Construction Contractors Board
  8. 24 CFR part 3280, Manufactured Home Construction and Safety Standards: interior privacy, interior passage and exit facilities — U.S. Government Publishing Office

Written by the LokalMatch editorial team. Last reviewed September 14, 2026. How we write and check our guides

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What affects the cost of interior door

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Number, size and style of windows or doors
  • Frame material and glass options
  • Full-frame replacement or insert
  • Repairs to rotted framing or sills
  • Interior and exterior trim and capping
  • Access, including upper floors

How to compare door installers before you hire

  • Look for an installer who measures on site and explains how the new window or door will be sealed and flashed.
  • Ask whether the quote is for a full-frame replacement or an insert, and why they recommend it.
  • Compare quotes on the same product type, glass options, installation method and interior and exterior trim.
  • Ask who handles warranty issues: the installer, the manufacturer or both.
  • For garage doors, choose a technician trained on springs and openers, since that work can be dangerous.

Questions to ask door installers before you hire

  • Will you replace the full frame or install an insert, and what's the difference for my home?
  • How will you insulate and seal around the new units?
  • Is interior and exterior trim included in the price?
  • What does the manufacturer's warranty cover, and what does your installation warranty cover?
  • How long will it take for the products to arrive once I order?
  • Will your own crew do the installation?

When to call a pro for interior door

  • Drafts, condensation or fog between the panes
  • Windows or doors that stick, won't lock or let water in
  • A garage door that's off track or has a broken spring: don't try to force it, and call a garage door technician.

Interior door permits and local rules

Some interior door work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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