FRAME MATERIALS
Wood Replacement Windows: Upkeep, Cladding and Cost
Two different homeowners land on this material: one who wants it, and one who has been told they have to have it. The right product, and the right questions, are not the same for both.
Timber core · exterior cladding optional · interior finished on site
Who it's for
Rooms whose character depends on joinery you can stain, older houses whose proportions were drawn around timber, and any property where a preservation body or a co-op board has already made the decision for you.
Cost drivers
Species and grade, cladding, non-standard sizes, divided lights, and who finishes the interior. More of this price is made to order than in any other material. National ranges for the job as a whole are on the cost guide.
Maintenance
A finish to keep, inside and out, unless the exterior is clad. No interval appears on this page: what governs it is exposure, finish type and how the sill sheds water, and none of that is a calendar.
What timber gives, and what it asks
A material worth choosing deliberately. Both columns are the reason people either love these windows or regret them.
Why owners choose it
- An interior that can be stained to match trim, doors and floors
- Profiles and proportions that suit an older house without pretending
- Exterior color that can be changed whenever the house is repainted
- Damage to the weather face is usually repairable by a carpenter
- The material most often accepted where a commission has jurisdiction
What it asks in return
- A finish that has to be inspected and renewed on the owner's watch
- Sills and bottom rails that punish standing water if the finish fails
- Made-to-order pricing, with fewer catalog shortcuts to fall back on
- Interior finishing that may be a separate trade on a separate invoice
- A district rule that can regulate the cladding you assumed was allowed
Exposure notes
- Sheltered elevations. A north wall under a deep overhang and a west wall with nothing above it are not the same window.
- Paint. Keeps water out well and fails visibly, by cracking and lifting, which at least tells you plainly when to act.
- Penetrating stain. Wears rather than peels. It needs attention sooner and is far less work each time.
- Sills and bottom rails. The horizontal surfaces where water lingers, and where rot starts in nearly every timber window that has any.
- Cladding. Removes the exterior half of the job outright and leaves the interior half exactly as it was.
Available styles
Projecting assemblies pull toward this material more than any other style, because the seat board is a piece of furniture in the room and reads as joinery or does not.
Two reasons to be here, and they lead different places
Sort out which one you are before you look at a single product.
The first reader wants timber. Usually that is about the inside of the house: a room with stained baseboards and stained doors where a white synthetic frame would sit awkwardly, or an older house whose interior character depends on the depth and grain of its joinery. This reader has a free hand, and the decision is a straightforward trade between the look they want and the upkeep they are willing to take on.
The second reader has been told by a preservation commission, an architectural review board or a co-op that the replacement has to meet a standard. Their decision is not aesthetic at all. It is a compliance problem, and the winning move is to find out exactly what is regulated before a salesperson proposes a product — because the constraint is frequently narrower than the word timber suggests, and sometimes broader.
Mixing the two up is expensive. A homeowner who assumes a rule exists may pay for a specification nobody required. A homeowner who assumes no rule exists may order a house full of windows that cannot be installed.
What is a clad-wood window?
The practical core of this material, and the distinction the retail listings blur.
| Where they differ | Solid timber | Clad timber |
|---|---|---|
| The weather face | Finished timber, protected only by its coating | A factory-applied metal or composite skin |
| Exterior refinishing | Part of owning it, on a schedule the exposure sets | Not required; the skin carries the weather |
| Exterior color | Can be changed whenever you repaint | Chosen at order time and effectively permanent |
| The interior | Timber, finished on site to match the room | Timber, finished on site to match the room |
| If the weather face is damaged | Repairable by a competent carpenter | Usually a factory part rather than a repair |
| Approval in a regulated district | Rarely questioned on material grounds | Depends entirely on the local rule — ask first |
Cladding is applied to the outside only. Whatever it does for the exterior, the interior of a clad unit remains timber and is finished and maintained as timber.
That last row is the one that catches people. Cladding is often assumed to be a universally acceptable modernization, and in many districts it is; in others the visible exterior material is precisely what is being regulated. It is a question with a factual answer available in a phone call, and it is worth making the call before the order rather than after the delivery. If the upkeep column is what puts you off, a paintable synthetic frame or a frame that asks for nothing at all are the honest alternatives, provided nobody has jurisdiction over the decision.
Six questions for the body with jurisdiction
Ask these before you shortlist products, and write the answers down.
- Does the requirement apply to the whole property or only to street-facing elevations?
- Is the material regulated, or only the appearance of the finished window?
- Is there a rule about the width of the frame and sash members that will be visible?
- Are simulated divided lights acceptable, or must the glazing be genuinely divided?
- Is exterior cladding on a timber window permitted, and in which finishes?
- Is approval needed before ordering, and how long does that review take?
The answers vary so much between districts that a general rule would be misleading, and this site does not offer one. What is consistent is the order of operations: get the constraint in writing from the authority, then ask companies to quote against the constraint, then compare. Doing it the other way round produces quotes that cannot be compared and occasionally an order that cannot be installed.
What moves the price of a timber window
More of this cost is made to order than in any other material.
Species and grade set the starting point. Whether the unit is clad, and in what, moves it again. Non-standard sizes are common in the older houses that want this material, and a made-to-measure sash costs differently from a catalog one. Divided lights add both material and labor, and simulated versions and genuinely divided ones are different products at different prices. Then there is finishing: an unfinished interior arrives as bare timber and somebody has to prime, stain or paint it, and that somebody is occasionally not in the window quote at all. Ask every company to itemize the interior finishing separately, and ask who does it.
Timber and clad-timber questions
Find the constraint, then find the window
Confirm what your district regulates, then ask for quotes written against that answer.