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Install a roof window.
Velux, Roto or Fakro roof window — measured opening, fitted with flashing and finished to current Part L.
✓ Updated Mar 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any windows starts on roof Window Installation.
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Itemised quotes from up to 3 local windowss on roof Window Installation — so you can compare like-for-like, not lump sums.
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Top tips
Hiring a windows, without the regret.
Four moves that separate a smooth job from a nightmare.
Leaking Flashing
Often caused by using the wrong flashing kit for the tile type or poor tucking of the underfelt.
Condensation
Frequently mistaken for a leak, this is usually due to poor internal "making good" that blocks airflow around the window.
Structural Sagging
Occurs when rafters are cut without installing proper horizontal trimmers to redistribute the weight.
Cold Bridges
Caused by gaps in the insulation collar, leading to cold spots and mould growth on the internal plaster.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Small Manual Window (55x78cm)Supply and fit, basic tile roof.
£550–£850
Medium Manual Window (78x98cm)Most popular size for bedrooms.
£750–£1.1k
Electric or Solar PoweredIncludes rain sensors and remotes.
£1.2k–£1.9k
Conservation Style WindowRequired for listed buildings.
£800–£1.3k
Scaffolding (if required)Depends on height and access.
£400–£900
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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