Wood Window Restoration in Madison, WI

Why original wood windows are worth keeping: old-growth wood, repairability, the look of the house

Is it worth restoring old wood windows? Three reasons come out of the sources: the wood itself, how repairable it is, and the look of the house.

Old-growth wood

The National Trust for Historic Preservation says wood windows made before the 1940s are likely old-growth wood. It describes that wood as stable and dense, milling well, holding paint and stain well, and naturally rot resistant (retrieved 2026-10-24). This is an advocacy source, and it makes no lifespan claim.

Repairability: part by part

The National Trust says a traditional window is built from parts that can each be repaired or replaced in kind: rails, stiles, muntins, stops, sill, stool and jamb. Vinyl, aluminum, fiberglass and composite windows are made as a single unit. Their parts generally cannot be repaired, so one failed part usually means replacing the unit. Renewal by Andersen sells replacement windows. It lists putty, sash cords and weights, and locks as typical repairs, and says sticky sashes and worn weatherstripping can often be fixed. It also says visible frame rot points toward replacement. It gives 15 to 30 years for wood frames with regular upkeep (a marketing figure, not independent).

The US National Park Service (NPS Preservation Brief 9, 1981, national guidance) recommends keeping and repairing original windows whenever possible. It says repaired and well-kept wood windows get greatly extended service lives. It says many are replaced because owners do not know repair and weatherization methods exist. It also says failed paint marks where water gets in, but the wood beneath is often still sound. Most windows need only maintenance or stabilization. Repair stays cost effective when few parts are replaced.

The look of the house

Madison's published historic district standards say original decorative windows shall be repaired and retained (an undated PDF, so confirm with the City Preservation Planner). The same standards allow replacing original windows only when they are too deteriorated or hazardous to repair.

Assessment: inspecting each sash, frame, sill and glazing bar, with a written proposal

Ask for a written proposal that lists the work for each opening, not one number for the house. For each window it should cover the sash, sill and frame, the glazing, how the window works and the paint. NPS Preservation Brief 9 says decay starts where rain and condensation collect: the sill, the joints between sill and jamb, corners of the bottom rails and muntin joints. It describes an awl or ice-pick test. Sound wood lifts in long fibrous splinters. Decayed wood lifts in short irregular pieces. A probe pushed straight in can find a rotted core under a sound-looking skin, which helps on sills. The proposal should cover these items:

• Sash: joints, rails, muntins, and whether it fits its opening.
• Sill and frame: the condition of the wood.
• Glazing: putty, loose or cracked panes, and whether the old glass stays.
• Operation: sash cords, stuck sashes, weatherstripping.
• Paint: its condition, and what lead-safe steps the job needs on a pre-1978 house.

Ask whether the window restoration estimate is free before you book.

On-site repairs: sash cords, tune-ups and weatherstripping

Sash cord repair

NPS Preservation Brief 9 calls replacing broken sash cords with new rope or chain one of the most common jobs. The weights are reached through a door in the frame near the sill or, if there is none, by removing the interior trim. Weights can be increased to make a window easier to lift. National cost data from This Old House, using Angi figures, puts sash cord repair at $35 to $110 per repair, with an average of $73 (retrieved 2026-06-23). HomeAdvisor gives $110 per window for a professional (retrieved 2026-06-17). Balances, locks and other parts are covered on the window balance and hardware repair page.

Freeing painted-shut and stuck sashes

Renewal by Andersen says sticky sashes are often caused by paint buildup, swelling or minor misalignment when the frame is not warped or damaged. NPS Preservation Brief 9 says removing excess or peeling paint layers makes a window work again. On a pre-1978 house, scraping and sanding that paint can fall under the lead rule, depending on how much paint is disturbed.

Tune-up and weatherstripping

NPS Preservation Brief 9 says every repaired window should be weatherstripped. Old felt is not likely to perform well and can hold moisture at the bottom rail. The Brief lists rolled vinyl strips, metal strips and plastic spring strips as options. It also says a sash lock on the meeting rail keeps the sash tight so the strips work better. Ask which wood window weatherstripping type is proposed (rolled vinyl, metal or plastic spring strips), where it goes and whether the sash needs trimming first. No source supports a percentage energy saving, so none is claimed.

Exterior work: glazing putty, paint and trim

Exterior work covers window reglazing and glazing repair, glazing putty (also called window putty replacement), spot glazing, paint, and trim or brick mold. Check which of these are in the proposal.

NPS Preservation Brief 9 says cracked, loose or missing putty lets water saturate the wood, mostly at the joints. Its reglazing steps are:

1. Remove the old putty by hand without damaging the sash, and pull the glazing points.
2. Number the panes and take them out to clean and reuse in the same openings.
3. Sand, patch and prime the bare wood. The Brief says glazing compound should only go on wood brushed with linseed oil and primed with an oil-based primer or paint.
4. Lay a bead of compound in the rabbet, press the pane in, push in new points and bevel the final putty.
5. Paint once a skin forms on the putty, usually in 2 or 3 days. The paint should lap slightly onto the glass to seal it.

Glazing is also where the lead-safe rule bites. The EPA says the glazing that holds older panes is typically painted and must be removed. The area of any removed part counts toward the 6 square foot minor-repair limit for a room. So a job called "just reglazing" can still be covered.

Full shop restoration: removing sashes, stripping, wood repair, reglazing, priming and painting, reinstalling

NPS Preservation Brief 9 lists five routine steps to bring a sound window back to like new:

• Paint removal.
• Removing and repairing the sash, with reglazing where needed.
• Repairs to the frame.
• Weatherstripping and reinstalling the sash.
• Repainting.

In its method, the paint seam at the stop and parting bead is broken first. The sash comes out and goes to a work area. The opening can be covered with polyethylene or plywood while it is away. The Brief says the frame is repaired in place wherever possible. Old glass may be historic, so it is kept and reused. On a house built before 1978, paint removal can fall under the lead rule, depending on how much paint is disturbed. The Brief is from 1981 and does not address lead, so do not rely on its paint-stripping advice.

Repairs to rotted parts

The Brief sorts repairs into three classes, each costing more and taking longer: routine maintenance, stabilizing the wood, and replacing parts. For stabilizing, it names consolidants and fillers. Epoxy is one. The Brief says it costs more than other fillers but is among the most durable. For badly decayed parts, a carpenter or woodworking mill makes matching pieces, or new wood is spliced into the old member. Most mills can duplicate muntins, bottom rails and sills. Some mills will not take old sash work, so you may have to shop around. If parts replacement gets too costly, its fallback is new wood sash fitted into the old frame.

Ask each company which windows would go to the shop, how many days your windows will be out and how the opening is closed in while the sash is away. For frame work beyond restoration, see sash and frame repair.

Wood window restoration cost in Madison: per sash cord, per window repair, and full restoration priced per window

No citable per-window price exists for a full restoration, so none is guessed here. The table shows the per-item national prices that are sourced. They are not Madison quotes, and a Madison company may price higher or lower.

What changes the job and the quote

• Number of windows and sashes: price each opening, not the house.
• Repair class: maintenance, stabilizing or parts replacement, each costing more than the last (NPS Preservation Brief 9).
• Filler method: epoxy costs more than other fillers, and splicing in new wood takes more skill and costs more (NPS Preservation Brief 9).
• Rot in the frame: Renewal by Andersen says visible frame rot points toward replacement.
• Shop work: some mills will not take old sash, so ask who does the shop work (NPS Preservation Brief 9).
• Lead-safe steps on a pre-1978 house: DHS requires a certified lead company and renovator on covered paid work and lists containment and cleanup as questions to ask, so ask that they be in the quote (Wisconsin DHS).

Restoration vs replacement: cost, efficiency with storms and weatherstripping, and permits

The National Trust says retrofits of historic windows perform comparably to new replacement windows at a fraction of the cost. That is an advocacy claim with no figure attached. No source here gives an energy saving in dollars or percent for restoration, weatherstripping, storm windows or replacement, so none is claimed. Any company that quotes a percentage should show where it comes from.

A fair comparison asks for a restoration proposal and a replacement quote for the same windows. Compare what each includes: removal, glass, trim, paint, permit, lead-safe steps and disposal.

Madison's permit chart lists "Windows & Frames - replace" as needing a permit from Building Inspection (retrieved 2026-10-24). The city's storm-damage page also says a building permit is required to replace windows. Like-for-like replacement in the same opening can be permitted online for one- and two-family homes. Changing the opening needs plan review. The city says small repairs under $500 in estimated value need no permit. The chart has no row for restoration, reglazing or glass-only work. So it does not say a glass-only job is exempt. For a restoration job, contact Zoning staff or Building Inspection before the work starts.

How to choose a window restoration company

• Ask for its DHS lead company certification and check it on the state list (details in the lead section).
• Ask what is done on site and what goes to the shop.
• Ask for a written, itemized proposal, window by window.
• Ask who handles the Madison permit question, and the Preservation Planner if you are in a district.
• Ask how the opening is protected while a sash is away.
• Ask for the type of weatherstripping, putty and paint, and the number of coats.
• Get a written contract with the job description, total price, and start and completion dates, as the Wisconsin consumer protection agency (DATCP) advises.

Madison Window Repair is not a window company and does not do this work. We connect you with a local window restoration company. Send the quote form on this page or call, and see the contact page for how it works.

Call (804) 889-2677 or send the quote form on this page. We call you back within one business day.

Best time of year for restoration and how long it takes (on-site days vs weeks in the shop)

No source names a best season for Madison, and none splits on-site days from weeks in the shop. The one sourced example is NPS Preservation Brief 9 (1981, a staff member on a single window, not a contractor's schedule): the work took several days because putty, primer and paint need time to cure. Ask each company how many days a sash will be gone, and put start and completion dates in the contract.

Glass in old sashes: matching wavy or period glass, salvaged glass, safety glass where needed

NPS Preservation Brief 9 says old glass may be historic and often adds character, so panes that come out are numbered and reused in the same openings. If a pane is cracked, ask whether the company can offer matching wavy or period glass, salvaged glass, or plain new glass, and what each costs. Safety glass where needed is a separate question. Ask the company whether the new glass in that spot must be safety glass and which rule it relies on. This page does not state that rule. For single-pane work, read the page on window glass replacement.

Divided lites and replacement wood sashes

Ask whether the company can rebuild a broken muntin or make a replacement wood sash (custom wood sashes), who makes it, and how it matches the profile and pane pattern of the original.

In a historic district, the standards say a historic single-glazed sash may be modified to take insulated glass. This can be done when it will not put the sash at risk or greatly change how the window looks. Confirm with the City Preservation Planner before assuming it.

Storm windows with restored sashes

Madison averages 51.8 inches of snow a year, a January mean of 19.4 F (1991-2020 normals, UW-Madison State Climatology Office) and 7,138 heating degree days. NPS Preservation Brief 9 says exterior storm windows are thermally efficient, cost-effective and reversible, and let the original windows stay. It warns that interior storms can trap moisture against the old window. The National Trust says exterior storms extend the life of historic windows. It says interior storms reduce potential exposure to lead paint. The Brief's 1977 figures rated a single-glazed wood window with a storm better than a double-glazed metal window of that era without a thermal break. They do not compare against modern replacements. Storms can be repaired. Nationally, storm window repair costs $100 to $300 per window, with an average of $200 (This Old House, retrieved 2026-06-23). Madison prices may differ. The page for screen and storm window repair covers types and care. In Madison's historic districts, the standards say storm windows shall have a matching or one-over-one pane layout. It must not hide the historic window.

Lead paint: do old windows often have it? We found no source on how often; homes built before 1978 may have lead paint, and the lead-safe rule for paid work applies (Wisconsin DHS)

No source we read says how often old windows have lead paint. Wisconsin DHS says lead was banned from residential paint in 1978, and lead may still be present in homes built before that year. Wisconsin DHS and the EPA both describe the lead-safe rule for paid work in pre-1978 homes. The chapter text was not read for this page, so we do not cite a chapter number. Ask the company which rule it works under.

Public Health Madison and Dane County names homes built before 1978 as the most common source of lead exposure. The EPA notes that the glazing holding older panes is typically painted. Wisconsin DHS says renovation, repair or paint work done for pay on homes and child care centers built before 1978 is covered. Any company that offers to do covered work must be a certified lead company. A sole proprietor needs both individual and company certification. Each project needs an assigned certified lead-safe renovator. The state's page lists window removal and window replacement among the covered jobs and does not treat window repair separately.

What the rule covers

For pre-1978 homes, the DHS hire-a-contractor page says the rule covers interior work disturbing more than 6 square feet of painted surface per room, exterior work disturbing more than 20 square feet, window replacement, and demolition. DHS says window replacement is covered whatever the window material: even replacing vinyl windows counts.

Small jobs: what the EPA and the Wisconsin DHS FAQ say

The EPA says work disturbing 6 square feet or less of paint per room inside, or 20 square feet or less outside, falls outside the federal rule. Window replacement is the exception, and it is always covered. The EPA says replacing a pane or fixing a balance is not a window replacement. It can still be covered if it disturbs more than 6 square feet of paint per room. The DHS FAQ describes the 6 and 20 square foot figures as triggers. The page, as read, lists no minor-repair exemption. For a small job, ask the company which rule it works under and why.

Who is outside the rule

DHS says owners working on their own home are generally outside the rule if only they and their immediate family live there, no child with a high blood lead level lives there and no part is rented. Rental property, and vacant property planned for sale or rent, is covered. The rule is about paid work, so it matters when you hire a company.

What to do before you sign

• Check the DHS certified lead company list, which is updated monthly, and confirm the company is on it.
• Confirm the worker is individually certified as a Lead-Safe Renovator and employed by a certified company. DHS says the renovator course is eight hours, with a four-hour refresher every four years.
• Expect the EPA Renovate Right pamphlet, handed over no earlier than 60 days before work starts, with a signed confirmation.
• Ask how the company will set up containment, use lead-safe work practices, clean up and check the area. DHS lists dry sweeping, methylene chloride paint strippers and collecting paint chips for lab analysis as prohibited practices. It calls for a HEPA vacuum on interior cleanup.
• Get a written contract and keep the certifications, the signed pamphlet form, a summary of the work and the cleaning check.

Historic districts: whether window work needs a review or permit from Madison Landmarks

Madison's published historic district standards say original decorative windows shall be repaired and retained. They say original windows may be replaced only when they are too deteriorated or hazardous to repair. That text applies to the districts, not to every Madison home. It comes from a PDF with no revision date.

Madison has five local historic districts (First Settlement, Mansion Hill, Marquette Bungalows, Third Lake Ridge and University Heights) and 184 local landmarks. The Madison Landmarks Commission oversees all of them. The count is not dated on the city's page. The commission reviews projects that change the exterior appearance of a designated landmark or of a building in a local historic district. A property is covered if its zoning carries a suffix such as HIS-L, HIS-UH or H. Check the zoning of your address with the city. For these properties, the commission must approve exterior changes. The city asks owners to apply for the Certificate of Approval before they apply for a building permit.

The city's page does not say that every window change needs approval. The standards add two points that matter for restoration. First, a project that only involves maintenance does not need a Certificate of Approval. Second, the Preservation Planner or a designee can approve repair proposals administratively. The maintenance standard says the wood of the window jamb, sash and trim shall be protected and maintained. It says deteriorated or broken parts shall be repaired. The PDF may predate later revisions, so ask the City Preservation Planner before you hire. The city also lists a Window Replacement Form and a Sample Window Assessment among its resources.

If you do not live in a district or on a landmark, these standards do not apply to you. Tenney-Lapham, Vilas and Dudgeon-Monroe are recognized city neighborhoods, but a neighborhood name alone does not tell you whether a house is in a district.

Wood window restoration questions

Can historical or specialty windows be repaired without losing character?

Madison's historic district standards say original decorative windows shall be repaired and retained. Ask any company how it matches profiles, muntins and glass, and in a district, have the Preservation Planner confirm the plan.

How much does it cost to restore a wood window?

No per-window price for a full restoration can be cited. Sourced per-item prices are in the table above. Ask each company to price every window after it has inspected it.

Is a small window job exempt from the lead renovation rule?

It depends on which rule applies. The EPA says work disturbing 6 square feet or less of paint per room inside, or 20 square feet or less outside, falls outside the federal rule, and window replacement is always covered. The Wisconsin DHS FAQ lists those figures as triggers and names no minor-repair exemption. The EPA says removed glazing counts toward its 6 square feet, but the DHS FAQ does not say whether removed glazing counts. Ask the company which rule it works under.

Does a company need lead-safe certification to work on windows in a home built before 1978?

Wisconsin DHS requires a certified lead company and a certified renovator on covered paid work, and lists window removal and replacement among the covered jobs. Whether a repair is covered depends on how much paint it disturbs. Ask for the certification either way.

Do I need approval to work on windows in a Madison historic district?

The city requires a Certificate of Approval for exterior alterations to locally designated properties. Its page does not say all window work needs one. Maintenance alone does not, and staff can approve repairs. Confirm with the City Preservation Planner.

Do I need a permit in Madison?

Replacing windows needs a permit. The permit chart has no row for repair or glass-only work, and the city says small repairs under $500 in estimated value need none. For a restoration, contact Zoning staff or Building Inspection.

When is the best time of year for window restoration?

No source we can cite names a best season for Madison. Ask each company how it closes the opening in cold weather and how long a sash will be away.

How do you extend the life of wood windows?

NPS Preservation Brief 9 (1981, national) says moisture is the main cause of decay. It says to find and stop the water, kill any fungus, then repair. It adds that windows kept up this way get greatly extended service lives. Madison's historic district maintenance standard says the wood of the jamb, sash and trim shall be protected and deteriorated parts repaired, but it applies only in the districts. NPS and the Madison standards give no lifespan numbers.

How do you open stuck wooden windows?

Renewal by Andersen says paint buildup, swelling or minor misalignment often cause sticking when the frame is sound. NPS Preservation Brief 9 says removing excess paint layers helps a window work again. On a pre-1978 house, the lead section applies.

How is glass replaced in a wooden window frame?

NPS Preservation Brief 9 describes the steps: remove the old putty and points, take the pane out, prime the bare wood, bed the new pane in a bead of compound, set points and bevel new putty (see the exterior work section). On an older house, the EPA says removed glazing counts toward the lead rule's 6 square foot limit.

Can a window restoration company also handle cracked panes?

Reglazing takes the panes out. NPS Preservation Brief 9 numbers them and reuses sound ones in the same openings. Ask whether glass work is in the proposal.

How long does wood window restoration take?

No contractor timeline is cited. NPS Preservation Brief 9 (1981) says putty and paint need days to cure, and its one-window example took several days overall. Ask each company how many days a sash will be out.

Sources

1. This Old House, window repair cost (retrieved 2026-06-23)
2. HomeAdvisor, window repair cost (retrieved 2026-06-17)
3. Wisconsin DHS, lead-safe renovation (retrieved 2026-10-18)
4. Wisconsin DHS, hiring a lead-safe contractor (retrieved 2026-10-18)
5. EPA, Renovation, Repair and Painting program (retrieved 2026-10-18)
6. EPA, window repair under the RRP rule (retrieved 2026-10-18)
7. City of Madison, historic preservation (retrieved 2026-10-18)
8. City of Madison, Historic Districts Standards (undated PDF) (retrieved 2026-10-18)
9. City of Madison, permit chart (retrieved 2026-10-24)
10. City of Madison, storm damage and permits (retrieved 2026-10-18)
11. City of Madison, online permits (retrieved 2026-10-18)
12. UW-Madison State Climatology Office, Madison climate (retrieved 2026-10-18)
13. City of Madison, neighborhood organizations (retrieved 2026-10-18)
14. Public Health Madison and Dane County, lead (retrieved 2026-10-18)
15. Wisconsin DATCP, home improvement contracts (retrieved 2026-10-18)
16. National Park Service, Preservation Brief 9: The Repair of Historic Wooden Windows (1981, national guidance) (retrieved 2026-10-24)
17. Wisconsin DHS, lead-safe renovation FAQ (retrieved 2026-10-24)
18. National Trust for Historic Preservation, retrofitting historic windows (retrieved 2026-10-24)
19. Renewal by Andersen, when to repair vs replace windows (retrieved 2026-10-24)
20. City of Madison, Landmarks and construction in historic districts (retrieved 2026-10-24)