Window Fitter
UK& Surrounding Area

A single window replacement in UK typically costs between £300 and £600, depending on the window size, frame material and glass specification. UPVC frames are the most affordable option, while aluminium and timber frames cost more. The price usually includes removal of the old window, fitting, and making good around the frame.

Yes, a dropped or misaligned window is one of the most common repairs window fitters deal with. The fix usually involves adjusting the hinges, replacing a broken gearbox mechanism, or realigning the sash within the frame. Most repairs take under an hour and cost between £60 and £150. Left unfixed, a window that won't close properly is a security risk and wastes energy.

Look for FENSA or CERTASS registration, which confirms they can self-certify building regulations compliance. Membership of the Glass and Glazing Federation (GGF) is an additional quality mark. Check that they carry public liability insurance of at least £2 million and ask for references from recent local installations. Avoid any fitter who cannot provide a registered scheme number.

Window energy ratings run from A++ (most efficient) down to C. An A-rated window significantly reduces heat loss compared to older double glazing and can cut your heating bills. The rating takes into account the glass, frame, and spacer bar performance combined. Since 2002, all replacement windows must meet a minimum standard of C-rated or equivalent U-value of 1.4 W/m2K.

Triple glazing costs around 30-50% more than double glazing and provides a modest improvement in thermal performance — typically reducing heat loss by a further 20-30%. For most UK homes, A-rated double glazing is the best value option. Triple glazing makes most sense if you live in an exposed or particularly noisy location, or if you are building a passive house to very high energy standards.

Sliding patio doors in UK cost between £800 and £2,000 fitted, depending on the width, frame material and glass specification. Bi-fold doors are more expensive, typically £1,500 to £4,000 for a three-panel set. All patio door installations must comply with building regulations, and a FENSA-registered fitter will handle the certification for you.