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A window and door fitter supplies and installs replacement windows, external doors and glazed units, from a single misted pane to a whole-house replacement. One rule matters more in Northern Ireland than anywhere else in the UK: there is no FENSA here. GB advice about self-certification does not apply — replacement window work in NI falls under our own Building Regulations, with sign-off running through your local council Building Control. Ask any installer how Building Control is being handled for your job and who is lodging it, and get the answer in writing before work starts.
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How is Building Control sign-off being handled, and who lodges it?
Is the quote for the identical spec as the survey — glass, frame, colour, hardware?
What is the guarantee on frames, units and installation, in writing?
Are you replacing the sealed unit or the whole frame, and why?
Will you make good plaster and render, or is that excluded?
What happens to the old frames and glass?
Do you have current public liability insurance?
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Typical costs in Northern Ireland
Job type
Typical price
Notes
uPVC casement window (small or medium)
£350–£650
Supplied and fitted; NI 2026
uPVC casement (large or bay)
£650–£1,200
Bay windows at the top end
uPVC back door
£550–£900
Standard half-glazed
Composite front door
£900–£1,800
Most popular front-door choice
uPVC French doors
£900–£1,600
Pair, supplied and fitted
Patio / sliding door
£1,200–£2,500
Two or three pane
Aluminium window (per unit)
£700–£1,300
Slimmer frames, dearer than uPVC
Aluminium bifold (3 pane)
£2,500–£5,000
Spec-driven, brand matters
Sash window (uPVC or timber)
£700–£1,400
Timber and conservation styles higher
Whole-house replacement
£3,000–£18,000
Most NI homes; size and spec driven
Prices are indicative and vary based on job complexity, materials and location within NI. Always get 2-3 quotes.
Qualifications & accreditations to look for
Building Control familiarity (NI)
No FENSA in NI — replacement glazing is signed off via council Building Control, and your installer should know the route
Glass and Glazing Federation (GGF)
UK-wide trade body for glazing firms, operates in NI
Manufacturer-approved installer schemes
Rehau, Veka, Kömmerling and similar approved fabricator/installer networks
CSCS Card
Construction Skills Certification Scheme — site competence
Public Liability Insurance
Minimum £2m — required on NI Trades for window and door work
Frequently asked questions
Do replacement windows need Building Control approval in Northern Ireland?
Replacement window and door work in Northern Ireland falls under the NI Building Regulations, and unlike England and Wales there is no FENSA-style self-certification scheme here — sign-off runs through your local council Building Control. In practice installers handle this differently, so the question to ask is direct: how is Building Control being handled for my job, and who is lodging it? Get the answer in writing. If you are ever unsure, your council Building Control office will tell you exactly what your job needs before work starts.
How much does double glazing cost in Northern Ireland?
Researched NI 2026 ranges: a small or medium uPVC casement window runs £350 to £650 supplied and fitted, larger and bay windows £650 to £1,200, and a whole-house replacement lands between £3,000 and £18,000 for most NI homes depending on size and specification. Aluminium runs dearer at £700 to £1,300 per window. These are ranges from real NI installer quotes, not GB averages — and you can check any quote you receive against them free with our Quote Checker.
My double glazing has misted up. Do I need new windows?
Usually not. Misting between the panes means the sealed unit has failed, and in most frames the glass unit can be replaced on its own while the frame stays put — significantly cheaper than full replacement. Frames that are warped, rotten or blown are a different story. A trustworthy fitter will tell you which situation you are in; a quote for whole-window replacement without explaining why the frames cannot be kept deserves a second opinion.
Should I sign up to a finance deal on the day to get the discount?
No — and this exact tactic is why we say it plainly. A discount that only exists if you sign today is pressure selling, common in the windows industry, and reputable NI installers give written quotes that survive a week of thinking. If you are considering finance, compare the financed total against the cash price for the identical specification, and check the quote itself against researched NI ranges first. Our answer on whether double glazing finance is a good idea covers the full weigh-up.
Important
The windows industry is where doorstep pressure-selling lives: a "today only" discount that vanishes if you take a week to think is a sales tactic, not a price. Reputable NI installers give a written quote that survives thinking time. And if a sealed unit has misted, you can usually replace just the glass unit rather than the whole frame — a fraction of the cost, and a question worth asking before anyone quotes you for full replacement.
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Practical guides
Before you hire a window & door fitter
Five-minute reads from the NI Trades editorial team on vetting, costs and consumer rights specific to Northern Ireland.