LondonProfessionalWindows
Find Local EngineersGet Cost Estimates

Find National Window Installers

Compare top-rated window installation companies with FENSA certification to find the perfect fit for your window replacement project

National Window Installers

DM Premium Installers
4.8

CoverageLondon
Response Time24-48 hours
Service Plan£150 per year

Key Features:

  • FSC-certified timber installations
  • Bespoke conservation area expertise

Works with: DM Window Solutions

Arkay Direct
4.7

CoverageGreater London
Response Time24-48 hours
Service Plan£120 per year

Key Features:

  • FENSA & CERTASS certified installers
  • Price match guarantee

Works with: Arkay Windows

Ada Installations
4.6

CoverageNorth London
Response Time48-72 hours
Service Plan£90 per year

Key Features:

  • Price-match guarantee
  • Fast local delivery

Works with: uPVC Window Factory

London Fitters Ltd.
4.5

CoverageLondon
Response Time24-48 hours
Service Plan£100 per year

Key Features:

  • Local expertise with rapid response
  • Energy-efficient installations

Works with: uPVC Windows London

NLW Installations
4.4

CoverageNorth & East London
Response Time24-48 hours
Service Plan£110 per year

Key Features:

  • Expert regional fitters
  • Acoustic glazing expertise

Works with: North London Windows

Why Choose Our Approved Installers?

All window installers on our platform meet our strict quality standards

FENSA Certified

Every installer is FENSA registered, ensuring compliance with building regulations and quality standards

Vetted & Reviewed

Customer ratings and verified reviews confirm the quality of workmanship and service

Competitive Pricing

Get quotes from multiple installers to find the best value for your window replacement project

What to Look for in a Window Installer

Certifications Matter

Always choose FENSA or CERTASS registered installers. These certifications ensure your windows are installed to meet building regulations and come with insurance-backed guarantees.

Material Expertise

Find installers with specific experience in your chosen window material (uPVC, aluminum, timber, or composite). Different materials require different installation techniques.

Warranty Terms

Compare warranty periods carefully. The best installers offer both product guarantees and workmanship warranties, with insurance backing for complete peace of mind.

Payment Terms

Look for flexible payment options and be wary of companies requiring large deposits. Reputable installers typically ask for a small deposit with the balance due upon completion.

Ready to Replace Your Windows?

Get free, no-obligation quotes from approved window installers in your area