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Most window complaints are not a reason to buy a window. A sash that will not stay up is usually a broken balance. A crank that spins without moving anything is an operator gearbox. A draft you feel standing three feet away is often perished weatherstripping or an unsealed rough opening rather than the glass. Fog trapped between two panes is a failed insulated glass seal, and on many units the sealed glass unit alone can be replaced in a frame that is otherwise sound.

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Two American rules shape who does that work and what may go back into the opening. Under the EPA's Renovation, Repair and Painting rule, anyone paid to perform work that disturbs painted surfaces in a home built before 1978 must be certified and their employees trained, and the agency is explicit that window replacement and demolition of painted surfaces are always covered regardless of square footage. Separately, the Consumer Product Safety Commission's federal safety glazing standard governs the glazing material used in doors, storm and combination doors, sliding patio doors and bathtub and shower enclosures, so replacing broken glass is not always a like-for-like swap.

Repair is often the better value on a sound frame, and on original wood sash it may be the only way to keep what makes a house look like itself.

Window symptoms and what is usually behind them

  • Haze or fog between the panes that wiping does not touch: the insulated glass seal has failed, and the sealed unit rather than the whole window is what has stopped working.
  • A sash that slams down or will not stay where you set it: broken or unhooked balances in a hung window, one of the most common repairs there is.
  • A crank that turns freely without moving the sash: a stripped operator gearbox, a separated arm or a track full of debris on a casement or awning unit.
  • A lock that no longer lines up: the sash has dropped or the frame is out of square, so forcing the lock damages hardware rather than fixing alignment.
  • A draft felt at the casing rather than at the sash: the rough opening was never properly air-sealed, which is a trim-off repair, not a new window.
  • Water on the interior sill after wind-driven rain: blocked weep holes, failed exterior sealant or flashing above the opening letting water in.
  • A soft, dark bottom rail or sill, or paint that will not hold there: rot, which has to be traced before any glass or hardware work is worth doing.
  • Condensation on the room-side glass in cold weather: usually indoor humidity meeting a cold surface, which is a different problem from a failed seal between panes.

When repairing a window beats replacing it

Repair makes sense when the frame is sound and the failure is a component. Balances, operators, locks, weatherstripping, screens and sealed glass units are all replaceable parts, and on a window whose frame is square, dry and well-flashed, replacing the failed part restores the window without opening the wall or disturbing the flashing that is currently working. There is a durability argument here that gets overlooked: a correctly installed window that is not leaking is a known quantity, and every replacement restarts the risk that the new opening is detailed badly.

Original wood sash deserves a separate thought. Old-growth wood frames are repairable almost indefinitely, with new glazing compound, spliced-in sections, re-corded weights and re-fitted sash, and a repaired sash paired with a storm panel keeps the appearance that a historic district or an older house depends on. Where design review applies, repair may be the only approved route.

Replacement wins when the frame itself is gone, when the failures keep multiplying across the same run of units, when parts for the line no longer exist, or when the opening has to change for other reasons. The honest test is whether you are fixing a part or propping up a frame.

Broken glass and the federal safety glazing standard

Glass is not interchangeable, and this is where do-it-yourself repairs and cut-rate glazing most often go wrong. The Consumer Product Safety Commission's architectural glazing standard, 16 CFR Part 1201, applies to the glazing material used in doors, storm doors and combination doors, sliding glass patio doors, and bathtub and shower doors and enclosures. It covers glass in its various forms, including annealed, organic coated, tempered, laminated and wired glass and combinations of them, and requires that architectural glazing products be tested in accordance with the applicable test provisions of ANSI Z97.1-2015.

On top of that federal product standard, the residential code your jurisdiction adopted identifies the locations in a house where glazing must be safety glazing, and the International Residential Code is adopted or in use in 49 states, the District of Columbia, Guam, Puerto Rico and the US Virgin Islands, amended by many jurisdictions as they adopt it. The practical consequence is simple: a pane in or beside a door, near a stairway or near a tub is not automatically allowed to be replaced with the same glass that was in it, particularly in an older house glazed before current requirements. Ask the glazier what glazing type they are installing and why, and if there is any doubt about the location, ask the building department.

One safety point that belongs next to any window work in a house with young children concerns the coverings rather than the glass. The CPSC warns that children have strangled to death on the cords of window blinds, shades, draperies and other window coverings, and that this can happen in moments even with an adult nearby. Its guidance is unambiguous: cordless window coverings are the only option that eliminates the strangulation hazard, and blinds sold before November 2000 should be replaced immediately.

Lead-safe rules apply to repairs in pre-1978 houses too

It is a common and expensive misreading to assume the federal lead rule only applies to big jobs. The EPA's rule covers anyone paid to perform work that disturbs painted surfaces in homes, childcare facilities and preschools built before 1978, firms may not advertise or perform that work without firm certification, and window replacement and demolition of painted surfaces are always covered regardless of square footage. Since window work concentrates on painted sashes, stops and casings, and since friction surfaces on windows are exactly where old paint turns to dust, this is not a technicality.

The work practices are specific, and they are a useful way to judge whether the person in your house knows the rule. The EPA's guidance calls for covering floors with plastic sheeting and tightly wrapping and sealing items that cannot be removed from the work area, and for cleanup that includes thoroughly mopping uncarpeted floors, cleaning walls with a HEPA vacuum or a damp cloth and vacuuming remaining surfaces. Several practices are ruled out: open-flame burning, high-temperature heat guns above 1,100 degrees Fahrenheit, power sanding or grinding without HEPA-equipped attachments, and dry scraping or sanding without dust suppression.

Verifying a firm takes minutes. EPA firm certifications are good for five years, the agency publishes a firm-location search, and a number of states run their own EPA-authorized programs where the certification to check is the state's. If a contractor proposes to take a heat gun or an orbital sander to the painted sash of a 1930s house, that is your answer about whether to hire them.

Upkeep that prevents most window repairs

  • Clear the weep holes at the sill each spring, since a blocked weep turns a working drainage path into standing water in the track.
  • Vacuum tracks and sills before operating a stiff window, because grit is what wears rollers, balances and weatherstripping.
  • Lubricate locks, hinges and operators with the product the manufacturer specifies rather than a general household oil that attracts dust.
  • Keep paint off weatherstripping, balances, tracks and hardware, which is the most common way a functioning window is disabled during a repaint.
  • Inspect exterior sealant joints annually and renew them before they crack through, especially at the head and the vertical joints of the trim.
  • Adjust sprinklers so they do not spray glass and frames daily, which drives mineral deposits into the glass and moisture into the joints.
  • Test every sash lock, not just the ones you use, since a lock that no longer engages is both a security problem and a sign that the sash has moved.
  • In a home with young children, switch to cordless window coverings, which the CPSC says is the only option that eliminates the cord strangulation hazard.

A broken window right now: making the opening safe until it is glazed

Treat broken glass as a hazard before treating it as a repair. Keep children and pets out of the room, wear cut-resistant gloves and eye protection, and lift larger shards rather than sweeping them first, since sweeping drives fragments into a wider area. Tempered glass fails into a mass of small pieces that travel much further than it seems they should, so vacuum well beyond the obvious debris field and check the far side of the room, upholstery and any floor register.

Secure the opening next. Remove loose glass still sitting in the frame so it cannot fall while you work, then close the opening with rigid board rather than plastic sheeting alone if it is at ground level or reachable, and fix it from the inside where possible. An opening covered only with tape and film is neither weather-tight nor secure.

Then make two calls before the glazier's. Report it if the breakage involved a break-in or vandalism, because an insurance claim will usually want the report number. And if the house predates 1978 and the break has disturbed painted sash or casing, the firm you hire to repair it is subject to the lead rule exactly as a replacement crew would be.

What a window repair quote depends on, and where LokalMatch comes in

Repairs are priced on identification and access more than on parts. A technician has to determine the manufacturer, the line and the vintage of the unit before the correct balance, operator or sealed glass unit can be ordered, and many older lines are supported only by aftermarket or salvaged components. Sealed glass units are made to order from measurements of the existing frame. Work above the first story, on fixed units, or on sash that must be removed and taken away changes the labor. A pre-1978 house adds containment and cleanup to even a modest repair.

It is reasonable to ask for a diagnosis before a price, and reasonable for a contractor to charge for the visit that produces it. What you should not accept is a quote for replacement issued without anyone having established what failed.

LokalMatch is the introduction step: describe the window problem once, with the symptom, the number of affected units, the approximate age of the house and the style of window if you know it, and window repair technicians serving your area get in touch with you. Those pros pay for the requests they receive. LokalMatch does not repair windows, does not set prices, and does not vet, rank or recommend anyone, so comparing the diagnoses you are given, and checking lead-safe certification on an older house, is up to you.

Window Repair: frequently asked questions

Can foggy windows be fixed without replacing the whole window?

Often, yes. Fog between the panes means the insulated glass unit has lost its seal, and on many windows that sealed unit can be replaced while the frame, the hardware and the existing flashing stay exactly as they are. It is measured from your opening and made to order. Replacement of the whole window becomes the better answer when the frame is also failing, when several units in the same run have gone, or when the line is no longer supported.

Is it worth repairing old wood windows instead of replacing them?

Frequently. Old wood sash can be re-glazed, spliced, re-corded and re-fitted, and paired with a storm panel it keeps both the appearance and the original material. In a historic district with design review, repair may be the only route that gets approved. The deciding factor is the condition of the frame and sill rather than the age of the window: rot that has reached the structure of the opening is a different project.

My house is from the 1940s. Does a small repair really trigger the lead rule?

For paid work, yes. The EPA's rule covers anyone paid to disturb painted surfaces in a home built before 1978, and the agency states that window replacement and demolition of painted surfaces are always covered regardless of square footage. Ask for the firm's certification, expect plastic containment and a thorough cleanup, and walk away from anyone proposing open-flame burning, a high-temperature heat gun above 1,100 degrees Fahrenheit, power sanding without a HEPA attachment or dry scraping.

A pane next to my front door broke. Can I just put the same glass back?

Not necessarily, and this is worth checking before ordering. The CPSC's federal standard, 16 CFR Part 1201, governs glazing material in doors, storm and combination doors, sliding glass patio doors and bathtub and shower enclosures, requiring testing to the applicable provisions of ANSI Z97.1-2015. Your adopted residential code separately identifies where in a house safety glazing is required, including locations in and beside doors. Ask the glazier which glazing type they are supplying, and ask the building department if the location is ambiguous.

Can I repair a window myself?

Some of it. Cleaning tracks, clearing weep holes, replacing weatherstripping and swapping a balance or a lock on a modern unit are within reach if you can identify the parts. Glass is the line to be careful about, both because of the handling risk and because the glazing type may be regulated in that location. And in a pre-1978 house, the lead rule governs paid work while the EPA still publishes lead-safe practices for homeowners doing their own, which is a strong hint about how the dust should be treated either way.

Sources

  1. CPSC safety standard for architectural glazing materials, 16 CFR Part 1201
  2. EPA: RRP Program requirements for contractors, including window replacement
  3. EPA: lead-safe work practices for do-it-yourselfers
  4. EPA: RRP firm certification and EPA-authorized state programs
  5. CPSC: window covering cord safety, go cordless
  6. ICC: International Residential Code adoption in the United States

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 window repair

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 window repair technicians 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 window repair technicians 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 window repair

  • 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.

Window repair permits and local rules

Some window repair 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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