Cost to Replace All Windows in 3-Bed House | Guide

How Much Does It Cost to Replace All Windows in a 3-Bed House?

Upgrading the windows in your home is one of the best ways to improve thermal efficiency, block out external noise, and boost property value. However, a whole-house replacement is a significant financial project. For homeowners planning their budgets, understanding the typical costs of a full window upgrade is essential. This guide breaks down the typical costs of replacing all windows in a standard 3-bedroom house in London and Surrey, comparing materials, labor, and supply options.

Expert Reviewed by Marian Gheorghe, Head Window Fitter — Last reviewed: July 2026

The Baseline: A Standard 3-Bedroom House Configuration

To provide realistic pricing, we assume a typical UK 3-bedroom semi-detached or terraced family home requiring 9 window openings of various sizes, configured as follows:

• Large Windows (e.g., Living Room / Dining Room): 2 openings (approx. 1800mm × 1200mm).
• Medium Windows (e.g., Bedrooms / Kitchen): 5 openings (approx. 1200mm × 1200mm).
• Small Windows (e.g., Bathroom / Landing): 2 openings (approx. 600mm × 900mm).

Turnkey Supply & Fit Costs (By Frame Material)

Choosing a Supply and Fit service includes the surveyor visit, ordering the A-rated double-glazed units and frames directly from manufacturers, delivery, professional fitting, internal trims, external weather sealing, and responsible disposal of old frames.

Here are typical cost ranges in London and Surrey for all 9 window openings:

1. Standard uPVC Casement Windows (White)

uPVC is the most popular and cost-effective material. It offers outstanding insulation (U-values of 1.2–1.3 W/m²K) and requires virtually zero maintenance.

• Estimated Total Cost: £4,200 to £5,800
• Average Cost Per Window: £450 to £650

2. Foiled uPVC Casement Windows (Anthracite Grey RAL 7016 / Woodgrain)

Choosing color foils (like Anthracite Grey, Black, or Rosewood) on the outside of uPVC frames adds to the manufacturing cost.

• Estimated Total Cost: £4,800 to £6,800
• Average Cost Per Window: £530 to £750

3. Slimline Aluminium Casement Windows (Powder-Coated)

Aluminium offers ultra-slim profiles, modern architectural styling, and a lifespan exceeding 40 years, but carries a premium cost.

• Estimated Total Cost: £7,500 to £10,500
• Average Cost Per Window: £830 to £1,150

4. Traditional Timber Sliding Sash Windows (Hardwood)

Ideal for historic sash properties or conservation zones where uPVC is not permitted. These are bespoke, handcrafted joinery items.

• Estimated Total Cost: £12,000 to £18,000+
• Average Cost Per Window: £1,300 to £2,000+

The Labor-Only Option: Installation Only

If you choose to source your own window frames independently from a direct trade fabricator, you can hire our team for the installation labor only. For a standard 3-bedroom house, a crew of two experienced fitters will take 1.5 to 2 days to complete the work. Our labor-only rate for fitting 9 standard windows averages £1,350 to £2,000 depending on site access, height, and disposal requirements.

Additional Factors that Affect the Cost

Be aware of these potential costs when planning your budget:

• Scaffolding: If your home has difficult-to-reach second-floor windows or sits on a steep slope, scaffolding may be required for safe external access, adding £300 to £800 to the project cost.
• Structural Lintel Replacements: If our surveyors discover that the brickwork above your old window frames is sagging or has no lintel, we must install structural concrete or steel lintels. This costs £250 to £500 per opening and requires building control sign-off.
• Local Planning Fees: If your property is in a conservation area and requires planning permission, the council application fee is typically £206. Building control notification fees for LABC inspection range from £150 to £250.

About the Author: Marian Gheorghe

Head Window Fitter & Active Director, Window Fitters Ltd

Marian Gheorghe is the Head Window Fitter and Director of Window Fitters Ltd. He has spent over 15 years estimating, surveying, and installing window packages for thousands of homes in London and Surrey.

Connect on LinkedIn → Expert Reviewed: July 2026

Cost FAQs

How long do new windows take to pay for themselves?

Upgrading from single to A-rated double glazing can save £200+ annually on heating bills. While the payback period through energy savings is 20+ years, new windows also add value to your property and improve comfort immediately.

Can I replace windows in stages to spread the cost?

Yes. Many homeowners choose to replace their front windows first to boost curb appeal, and then replace rear windows at a later date. However, ordering all windows at once allows you to negotiate a better package price and saves on labor and delivery setup costs.

What guarantee is included in the price?

Our turnkey pricing includes our standard 10-year guarantee on uPVC frames, a 5-year guarantee on glass units against seal failure, a 2-year warranty on locking hardware, and a 1-year workmanship warranty.