Window & Door Installer
A window and door installer supplies and fits replacement windows and doors for residential and commercial properties. From uPVC casements and aluminium bifolds to composite front doors and French doors, they improve your home's appearance, security, and energy efficiency.
What does a window and door installer do?
Window and door installers handle the full replacement process, including:
- Survey, measurement, and specification advice
- uPVC, aluminium, and timber window supply and installation
- Bifold, sliding, and French door installation
- Composite and timber front and back door installation
- Bay and bow window construction and installation
- Roof windows and skylights (Velux and similar)
- Removal and disposal of old frames
- Internal and external finishing (trims, sills, cladding)
Is window installation regulated?
Yes. Replacement windows and doors in England and Wales must comply with Building Regulations Part L (energy efficiency). Installers registered with FENSA (Fenestration Self-Assessment Scheme) or CERTASS can self-certify their installations, providing you with a Building Regulations compliance certificate.
If using a non-registered installer, you must apply to your local Building Control authority for approval, which involves an inspection and fee. The compliance certificate is important for property sales — its absence can cause complications.
New window openings (as opposed to like-for-like replacements) require Building Control approval regardless of installer registration, and may need planning permission.
What to look for when hiring a window installer
When choosing a window and door installer, consider:
- FENSA or CERTASS registration — Essential for self-certification. Check registration online before committing.
- Product quality — Ask about frame profiles, glass specifications (Low-E, argon-filled), and hardware. Not all windows are equal.
- Energy ratings — Windows are rated A++ to E. Higher-rated windows offer better insulation and lower energy bills.
- Insurance-backed guarantee — Choose an installer offering an insurance-backed guarantee (IBG) that protects you if the company ceases trading.
- Installation quality — Good installation is as important as good windows. Poor fitting causes draughts, leaks, and condensation.
Frequently Asked Questions
How much do new windows cost?
uPVC casement windows cost £400–£650 per window installed. Aluminium windows cost £600–£900 per window. Timber windows cost £850–£1,200 per window. A full house of uPVC windows (10 windows) typically costs £4,000–£7,000. Bifold doors cost £1,200–£2,000 per panel installed.
Do I need planning permission for new windows?
Like-for-like replacements (same size, same position) do not usually require planning permission, but always confirm with your local planning authority, especially in conservation areas, for listed buildings, or if you are changing window sizes or adding new openings.