How Much Do Timber Windows Cost in the UK? (2026 Guide)

Cost is usually the first filter homeowners apply, but with timber windows it’s a blunt tool. Two windows that look identical on paper can differ significantly in price because the work behind them is completely different—especially in older UK housing stock where nothing is square, dry, or consistent for long.

At Wood.ED Joinery, we don’t treat pricing as a fixed menu. We price the reality of the building, the specification required, and the level of correction needed to make the installation last.

If you’re researching timber window costs in the UK, the real answer is less about unit price and more about what problem you’re actually solving.

Typical cost ranges (and why they don’t tell the full story)

For 2026, most bespoke timber windows in the UK fall broadly into these ranges:

• Simple replacement timber casement window: £900–£1,800 per window

• Bespoke sliding sash window: £1,500–£3,500+ per window

• High-spec conservation or listed building units: £2,500–£5,000+ per window

Those numbers are useful only as a starting point. They assume:

• Reasonably square openings

• Standard access

• No structural correction

• Straightforward glazing specification

That’s rarely the case in Cornwall, Devon, and other older coastal regions where we work most.

Pulley wheel inserted into its recess.

What actually drives the cost

We see homeowners assume timber itself is the expensive part. In reality, material choice is only one part of the equation.

The main cost drivers are:

1. Condition of the opening

A perfectly plumb modern opening is quick to work with. A 150-year-old stone wall with 15–25mm deviation across the diagonal is not. We often need to design tapered liners or custom packing systems before the window even goes in.

2. Specification of glazing

Slimline double glazing for heritage work behaves differently from standard double glazing. It requires tighter tolerances, careful weight balancing in sash systems, and more precise bead detailing.

3. Timber selection

Accoya generally costs more upfront than softwood but reduces long-term movement issues. Hardwood varies depending on grade, stability, and whether engineered laminates are used.

4. Installation complexity

Access matters. A ground-floor straightforward casement is one thing. A second-floor sash window over uneven ground with restricted scaffolding access is another entirely.

5. Detailing requirements

Conservation areas often require historically accurate profiles. That increases machining time, reduces standardisation, and adds design work that isn’t visible in the finished product.

Real project example: unexpected cost variation in a Devon farmhouse

We were asked to replace a set of seven timber windows in a converted Devon longhouse. Initial survey suggested a relatively standard replacement job: remove softwood units installed in the early 2000s and fit new bespoke Accoya casements.

Once we stripped the first unit, the situation changed.

The original openings had been widened inconsistently during past renovations. One window was 22mm wider at the top than the bottom. Another had a stone lintel that had rotated slightly outward, creating a permanent outward lean.

This meant we couldn’t install directly into the openings without correction. We introduced custom-made sub-frames to true each opening before installing the windows themselves.

That added:

• Additional workshop fabrication time

• Site templating and re-measurement visits

• Extra installation labour for sub-frame correction

• Rework of internal plaster reveals to align finishes

The final cost per window increased by roughly 20–30% compared to initial estimates—not because the windows changed, but because the structure underneath was revealed properly.

That’s common in older properties. The price doesn’t change because the joinery is different. It changes because the building tells you the truth only once you start removing parts of it.

Why timber windows vary more than uPVC or aluminium

uPVC systems are heavily standardised. Timber isn’t. Every unit is manufactured individually, which means every variable affects cost directly.

Timber responds to:

• Moisture levels in the building

• Exposure to wind and salt

• Architectural irregularity

• Required repair of surrounding fabric

This flexibility is the reason timber is still used in restoration work—but it also means there’s no “fixed price” that holds across all properties.

Hidden costs homeowners don’t expect

Most surprise costs don’t come from the windows themselves. They come from what is discovered during installation.

Common examples:

• Rotten sills hidden beneath previous PVC frames

• Failed lintels or cracked masonry around old fixings

• Uneven plaster reveals requiring rework

• Need for scaffold changes once access is assessed properly

We’ve had jobs where the joinery was only 60% of the total cost, with the remaining 40% coming from correcting the building so the joinery could function correctly.

That’s not unusual in properties older than 80–100 years.

Maintenance cost over time

Initial cost is only part of the equation. Timber windows spread cost over decades if maintained correctly.

Typical lifecycle costs include:

• Repainting or recoating every 5–8 years (varies by exposure and products used)

• Minor seal or ironmongery adjustments

• Occasional local repairs to end grain or sill edges

Compared to uPVC, which is “lower maintenance,” timber requires periodic attention—but it also allows repair rather than full replacement. A failed timber section can often be spliced, not scrapped.

That changes long-term cost structure significantly.

Are cheaper timber windows worth it?

There’s a clear threshold where lower-cost timber systems start to create problems:

• Softer timber species in exposed coastal environments

• Poor joint design (especially mechanical fasteners instead of proper joinery)

• Inconsistent moisture control during manufacture

• Thin or low-spec coatings that break down quickly

The issue isn’t just durability. It’s movement. Cheaper units tend to move more, which leads to seal failure, sticking sashes, and paint breakdown within a shorter cycle.

You don’t always see the cost difference upfront. You see it in year 3–5 performance.

FAQ

Why are bespoke timber windows more expensive than uPVC?Because each unit is individually manufactured, measured, and fitted to a specific opening rather than produced in standard sizes.

Can I reduce cost by using softwood instead of hardwood or Accoya?Yes, but only in lower-exposure areas. In coastal or high-rainfall zones, cheaper timber often increases long-term maintenance costs.

Does installation affect the price as much as the window itself?In older properties, yes. Site conditions often determine labour time more than manufacturing does.

Are listed building timber windows always more expensive?Usually, yes. Not because of regulation alone, but because design constraints reduce standardisation and increase bespoke detailing.

How Much

How Much timber window cost doesn’t sit neatly in a catalogue. It shifts with the building, the exposure, and how much correction is needed before the window can even do its job. The numbers matter, but they only make sense once you understand what they’re built on.