COMPLETE WINDOWS SERVICE IN UK - SUPPLY, FIT
More Than Just Glass
At Win-Doors INT LTD, we supply and fit A+ rated double glazing windows across London. From free measurement to expert installation by certified fitters - we ensure perfect fit, energy efficiency & security for new builds, renovations & replacements.
Our Windows
Everything we make and fit designed, manufactured and installed by windoors team.
CasementSide-hinged window that opens outward for ventilation.
Flush CasementSleek, flat-frame window sitting flush with the wall.
Sliding SashClassic vertical sliding window with timeless elegance.
Tilt & TurnDual-function window tilts for ventilation, turns inward.
GeorgianElegant 6-pane sash window, symmetrical & timeless.
Bay & BowAngled 3-panel bay projecting out, bright spacious.
Curved 4-6 panel bow, graceful panoramic light.Why Upgrade Your Windows With Us?
Energy Saving Windows
Looking for energy saving windows in London? Our A+ rated double glazed and A+ rated triple glazed windows reduce heat loss by up to 35%, saving the average Southall & Ealing home £235 per year on heating bills. With U-Value 1.0 W/m²K, 28mm argon-filled units, Low-E soft-coat glass and warm-edge spacer bars, our windows are BFRC certified and meet UK Building Regulations Part L. Improve your EPC rating from D to C/B, add value to your property and reduce your carbon footprint. Made in UK, fitted in UB1, UB2, W5, W7 & Greater London with 10-year energy guarantee. Free energy survey available.
Secure Windows London
Looking for secure windows in London? Win-Doors INT LTD Southall installs Secured by Design windows with Yale 8-point multi-point locking, toughened safety glass and internal beading across Southall, Ealing, Hounslow & Greater London (UB1, W5, W7). Our uPVC windows London meet PAS 24:2022 and BS 7950 security standards. Multi-point locks engage at 8 points, bolted into steel-reinforced 70mm frames - impossible to force with a crowbar. 4mm toughened glass is 5x stronger than standard, while 6.8mm laminated glass holds together even when smashed, ideal for ground floors in Southall High Street. Internal glazing beads prevent glass removal from outside - a key police recommendation. For maximum protection, our Secured by Design (SBD) range is police-tested against real burglary tools and can cut home insurance by 5-7.5%. Book your free security survey in Southall today - FENSA approved, Part Q compliant, 10-year guarantee.
Noise Reduction
Need noise reduction windows in London? Win-Doors INT LTD Southall installs soundproof windows London with up to 70% less outside noise - perfect for homes near A40, M4, Heathrow flight path, Southall High Street & Ealing Broadway. Our double glazed windows reduce noise by 32dB, while A+++ triple glazed windows achieve 40dB reduction - turning 70dB traffic into a quiet 30dB whisper. Featuring 28mm-44mm argon-filled units, acoustic laminated glass and warm-edge spacer bars, our noise reducing glazing London is tested to BS EN 12758. Ideal for UB1, UB2, W5, W7 bedrooms, home offices and flats. Block traffic, planes and neighbours, sleep peacefully. Book your free noise survey in Southall - FENSA approved, 10-year acoustic guarantee.
Low Maintenance
Looking for low maintenance windows in London? Win-Doors Southall fits easy-clean uPVC windows London that need no painting, no rotting, no warping - just wipe clean. Our A+ rated tilt-and-turn windows have smooth, UV-resistant frames that never fade or crack. Unlike timber, uPVC resists damp, mould and London pollution. 10-year guarantee, FENSA approved in Southall, Ealing, UB1, W5. Spend weekends living, not painting. Book your free survey today.
Made to Measure
Need made to measure windows in London? Win-Doors INT LTD Southall manufactures custom windows London to your exact laser-measured opening - CNC cut to ±0.5mm precision. No standard sizes, no gaps, no drafts. Every uPVC, aluminium and timber window & door is bespoke-built in the UK for heritage and new builds in Southall, Ealing, Hounslow, UB1, W5, W7 & Greater London. Perfect fit for bay, sash & unusual openings. FENSA approved, 10-year guarantee. Book your free laser survey today.
Our Installation Process
From first call to final clean-up, one team handles the whole job.
- 1 Free Survey & Quote
We visit, measure, show samples, give fixed price.
- 2Custom Manufacturing
Your windows are made to order in the UK.
- 3Professional Installation
Our own installers. We remove old windows, fit new, insulate, seal, and finish perfectly. 1 day for most homes.
- 4Aftercare & Guarantee
10 years insurance-backed guarantee + FENSA certificate.
Frequently asked questions
How much does window installation cost in London?
Window installation cost in London in 2026 ranges from £350 to £850 per window fitted, including VAT, FENSA certificate and 10-year guarantee. At Win-Doors INT LTD Southall, average prices are: uPVC casement windows: £350-£550 per window (most popular in Southall, Ealing, UB1) Flush sash uPVC windows: £550-£750 per window (heritage look for London terraces) Aluminium windows: £650-£850 per window (slimline, modern) Bay windows (3-section): £1,200-£2,500 fully fitted A full house (8 windows) in London W5, UB1, UB2, W7 costs £3,500-£6,500 for A+ rated double glazing. Price includes: Free survey, laser measurement, custom UK manufacturing, removal of old windows, fitting by our own FENSA installers (not subcontractors), insulation, sealing, internal trims and FENSA certificate. Factors: Size, style, glazing (double vs triple), colour, and access. We offer fixed-price quotes with no hidden costs and 0% finance.
How Long Does It Take To Install New Windows in London?
Most window installations in London take 1 day for a full house (6-8 windows) and 2-3 hours for 1-2 windows. Our 1-Day Process at Win-Doors Southall: Morning (8am-12pm): Our own FENSA installers (not subcontractors) protect floors, remove old windows, and fit new frames. Afternoon (12pm-4pm): Glass installed, insulated with expanding foam, sealed with silicone, trims finished, and site cleaned. Bay windows: 1 day per bay. Full house with 10 windows + front door: 2 days. Your home is never left open overnight. We remove one window at a time, so your property stays secure and weatherproof. Manufacturing time: After your free survey in Southall, Ealing, Hounslow, your custom windows are made to order in the UK in 10-15 working days. Book a free survey and get fitted in 2-3 weeks - fastest turnaround in UB1, W5, UB2.
What Is The Difference Between uPVC and Aluminium Windows in London?
uPVC vs Aluminium windows London - Key Differences: uPVC Windows London (Most Popular - 80% of Homes in Southall): Cost: £350-£550/window - Most affordable Energy: A+ rated, U-Value 1.0 - Warmer Style: 18 colours, woodgrain options, traditional look ideal for UB1, UB2 terraces Maintenance: No painting, 10-year guarantee, 25-year lifespan Best for: Family homes, rental properties, energy saving Aluminium Windows London (Premium Modern): Cost: £650-£850/window - Premium Energy: A rated, U-Value 1.2 with thermal break Style: Ultra-slim 35mm sightlines, 200+ RAL colours, modern, Crittall-style Maintenance: Powder-coated, never rusts, 45-year lifespan Best for: Modern extensions, bi-folds, commercial, luxury homes in Ealing W5 Which to choose in London? Choose uPVC for energy saving and value in Southall, or aluminium for slim modern design in Ealing. Both are FENSA approved at Win-Doors INT LTD.
Do You Provide FENSA Certificates for Windows in London?
Yes. Win-Doors INT LTD Southall is a FENSA and CERTASS approved window installer in London - every installation in Southall, Ealing, Hounslow, UB1, W5, W7 comes with a FENSA certificate and 10-year insurance-backed guarantee. What is FENSA? FENSA (Fenestration Self-Assessment Scheme) is Government-authorised. A FENSA certificate proves your new windows meet UK Building Regulations Part L (energy efficiency), Part F (ventilation) and Part Q (security). Why you need it: Required by law for all replacement windows in England. Needed when selling your home - solicitors and buyers in London will ask for it. Without FENSA, you must get approval from your local council (Ealing Council charges £400). We register your job with FENSA within 14 days. You get certificate by post + online. Included free.
Can you match windows for listed buildings?
Yes. Win-Doors INT LTD specialises in listed building windows London and conservation area windows Southall & Ealing. We match heritage windows for Grade II listed buildings, Ealing Conservation Areas, Southall & Hanwell with: Flush sash uPVC: Timber-look flush finish, approved by Ealing Council planning for many conservation areas Timber windows: Genuine hardwood & Accoya, double glazed, with putty-line detail for listed buildings Secondary glazing: For Grade I & II* where original single glazing must be kept - adds A+ efficiency without replacing historic glass Slimline double glazing: 12mm units that look like single glazing for heritage approval We provide CAD drawings, heritage reports and planning support for Ealing Council and Hounslow Council. We have matched windows in Southall Conservation Area, Ealing Green, Hanwell - saving homeowners £5k+ vs timber. Book a free heritage survey in UB1, W5, UB2 - we handle planning for you.