Cost to Replace All Windows in a 3-Bed House (2026 UK Guide)
Replacing all windows in a standard 3-bedroom semi-detached or terraced house in Greater London and Surrey typically ranges between £4,800 and £14,500 including VAT, custom manufacture, CSCS-certified installation, and Building Control certification. The total investment varies based on frame material (uPVC, aluminium, or engineered timber), window style (casement, vertical sliding sash, or flush sash), opening sizes, structural bay window posts, and glazing specifications.
A typical UK 3-bedroom semi-detached home features 8 to 10 window openings: a front ground-floor 3 or 5-segment bay window, kitchen window, rear dining window/patio, 3 first-floor bedrooms, bathroom, and stairwell landing window.
Quick Summary: Average Costs for a 3-Bed House in London
How much does it cost to replace all windows in a 3-bedroom house in London?
Replacing 8 to 10 windows on a 3-bedroom semi-detached home in Greater London costs between £4,800 and £7,200 for standard A-rated white uPVC casements, £6,500 to £9,000 for timber-alternative flush sashes, and £9,500 to £14,500 for architectural slimline aluminium systems. Complete packages with replacement front and rear doorsets range from £7,500 to £18,000. For labour-only fitting where clients supply frames, glazier teams cost £540 per day local (under 15 minutes travel) or £580 per day extended (15 to 45 minutes travel).
Typical 3-Bedroom Window & Doorset Schedule
Most 1930s to 1980s semi-detached and terraced homes across South London, Croydon, Bromley, Wandsworth, and Surrey share a consistent fenestration schedule comprising 8 to 10 window openings and 2 external entrance doors:
| Location in House | Window Format & Typical Aperture | Glazing & Hardware Spec | Average Replacement Cost |
|---|---|---|---|
| Living Room (Front) | 3 or 5-segment structural bay window (2,400 x 1,500 mm) | A-rated 28 mm Low-E Argon units with structural bay jacks | £1,600 to £2,600 |
| Dining Room (Rear) | Large 2 or 3-pane casement or patio slider (1,800 x 1,200 mm) | Toughened safety glass, trickle vent F-compliance | £600 to £1,100 |
| Kitchen | Single or 2-pane side-opening casement (1,200 x 1,000 mm) | Easy-clean friction stays, 4,000 mm² trickle vent | £450 to £700 |
| Master Bedroom (Front) | 3-segment upper bay or flat 3-light casement (1,800 x 1,350 mm) | Approved Document B egress escape hinges, acoustic glass option | £900 to £1,500 |
| Bedroom 2 (Rear) | 2-pane casement (1,350 x 1,200 mm) | Egress escape hinge, multi-point shootbolt | £500 to £800 |
| Bedroom 3 / Box Room | Single or 2-pane small casement (900 x 1,050 mm) | Standard side-hung opener, 8,000 mm² trickle vent | £400 to £650 |
| Family Bathroom | Top-hung awning or casement (800 x 900 mm) | Obscure privacy glass (Pilkington Level 3-5), trickle vent | £380 to £600 |
| Stairwell / Landing | Fixed or single casement (700 x 1,000 mm) | A-rated Low-E double glazing, safety glass if low cill | £350 to £550 |
| Composite Front Door | 44 mm or 48 mm solid timber core doorset (900 x 2,100 mm) | PAS 24 3-star cylinder, Ultion lock, AV2 auto slam lock | £1,200 to £2,200 |
| Rear French / Patio Door | Double French doors or 2-pane patio slider (1,800 x 2,100 mm) | Toughened safety glass, multi-point deadbolts | £1,500 to £2,800 |
Cost Breakdown by Frame Material (8 to 10 Window Package)
Complete project cost estimates across major frame materials for a 3-bedroom home:
| Frame Material & Window Style | Average Installed Cost (Inc VAT & Fitting) | Expected Lifespan | Key Benefits |
|---|---|---|---|
| Standard White uPVC Casements | £4,800 to £7,200 | 25 to 30+ years | Most cost-effective; A-rated thermal efficiency; zero maintenance |
| Foiled Woodgrain / Anthracite Grey uPVC | £6,200 to £8,800 | 25 to 30+ years | Architectural colour aesthetics (RAL 7016); authentic woodgrain texture |
| Timber-Alternative Flush Sash uPVC | £6,500 to £9,000 | 30+ years | Period aesthetics; mechanical 90-degree joints; Conservation Area suitability |
| Architectural Aluminium Casements | £9,500 to £14,500 | 40 to 45+ years | Ultra-slim 58 mm sightlines; high structural rigidity; polyester powder coating |
| Engineered Hardwood Box Sash Windows | £14,000 to £22,000+ | 60+ years | Authentic Victorian/Georgian joinery; Listed Building & Conservation compliance |
Labour-Only vs Supply-and-Fit Pricing Comparison
Homeowners and self-builders can choose between purchasing windows directly from trade suppliers or commissioning a complete installation package from Window Fitters Ltd:
| Cost Element | Labour-Only Subcontract Pathway | Complete Supply & Fit Package |
|---|---|---|
| Measuring & Survey | Client measures or books survey (£50 local, £80 extended) | Included free with contractor laser survey accountability |
| Material Procurement | Client buys frames directly from trade counter (£3,200 to £5,000) | Supplied directly from approved UK systems fabricators |
| Installation Labour | £540/day local or £580/day extended (2 to 3 days = £1,080 to £1,620) | Included within overall contract price |
| Fixings & Sealants | Materials charged at trade cost (~£120 to £180) | Included (calibrated bridge packers, foam, neutral silicone) |
| Old Frame Disposal | Quoted per item or arranged via skip | Included under Environment Agency licence CBDL650268 |
| Total Estimated Cost | £4,400 to £6,800 (trade client savings of 15% to 25%) | £4,800 to £7,200 (standard uPVC) to £14,500 (aluminium) |
| Warranty Coverage | 12-month fitting warranty; manufacturer frame warranty | Comprehensive 10-year written guarantee on frames and glass |
Structural Bay Post Jacking
Replacing 1930s bay windows requires load-bearing bay poles and jacks (+£350 to £600) to support upper floor brickwork under Approved Document A.
Fixed Transparent Quotes
All Window Fitters Ltd quotes include on-site survey, made-to-measure UK fabrication, fitting, trim finishing, waste disposal, and 10-year warranty.
Explore related cost and efficiency resources: review our full installation cost guide, check package details on our uPVC windows page, inspect architectural profiles on our aluminium windows page, explore period sash windows, calculate door fitting budgets in our bifold door costs guide, and discover heating bill savings in our energy saving windows payback guide.
Frequently Asked Questions About Cost Replace All Windows 3 Bed
Consult detailed pricing benchmarks for replacing all windows and doors in a three-bedroom property across London and Surrey boroughs.
How much does it cost to replace all windows and doors on a 3-bedroom house in London? +
Replacing 8 to 10 standard windows and 2 external doors on a typical 3-bedroom semi-detached house in Greater London and Surrey costs between £4,800 and £7,200 for A-rated uPVC casements, £6,500 to £9,000 for timber-alternative flush sash windows, and £9,500 to £14,500 for architectural slimline aluminium systems. These figures include technical survey, made-to-measure UK manufacture, CSCS glazier installation, old frame recycling, and Building Regulations certification.
What key factors affect the total cost of a residential window replacement project? +
The primary cost drivers include frame material (uPVC, aluminium, or timber), window opening styles (casements, sliding sashes, or tilt-and-turn), structural bay window jacking posts, specialist glass specifications (acoustic laminate, triple glazing, or solar control), external scaffolding requirements for upper storeys, and lintel repairs.
How much more expensive are aluminium windows compared to standard uPVC? +
Architectural aluminium windows typically cost 45% to 65% more than standard white uPVC. While uPVC casements cost £450 to £720 per window fitted, aluminium casements range from £750 to £1,200 per window fitted. Aluminium provides slimmer 55 mm sightlines, enhanced structural rigidity for large openings, and a 40+ year lifespan with marine-grade polyester powder coating.
What is the price difference between labour-only fitting and supply-and-fit packages? +
For a 3-bedroom house with 8 to 10 windows, labour-only glazier installation costs £1,080 to £1,620 (2 to 3 days for a 2-man team at £540 local or £580 extended day rates, or £90 to £140 per casement unit), with the client purchasing frames directly from trade suppliers. Supply-and-fit packages range from £4,800 to £14,500, providing complete single-contract accountability, survey insurance, and a 10-year written warranty.
How long does it take to replace all windows in a 3-bedroom house? +
A full window replacement on an occupied 3-bedroom semi-detached property typically takes 2 to 3 working days for a professional 2-man glazier team. Day 1 focuses on ground-floor openings, Day 2 completes first-floor bedrooms and bathrooms, and Day 3 addresses external perimeter silicone sealing, internal trim finishing, and clean-up.
What is included in a comprehensive supply and fit window quote? +
Written supply-and-fit quotes from Window Fitters Ltd include an on-site laser survey, custom UK fabrication to exact aperture deductions, removal and 100% recycling of old frames under waste carrier licence CBDL650268, low-expansion thermal perimeter insulation, neutral silicone weathersealing, internal architrave trims, LABC Building Regulations coordination, and a 10-year written guarantee.
Author & Technical Reviewer: Marian Gheorghe
Head Installer & CEO, Window Fitters Ltd
Marian Gheorghe is the Active Director and Team Leader Installer at Window Fitters Ltd. With over 15 years of hands-on experience, he oversees technical safety and UK Building Regulations compliance for all residential and commercial glazing contracts.
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