Roof lantern buying guides
Everything we explain to customers before they order, written down. Each guide lists its official sources.
How do you measure for a roof lantern?
Measure the outside of the kerb, check it is square with the diagonals and give width before length. A step-by-step guide with the mistakes to avoid.
5 min read →
What size roof lantern do I need?
Standard roof lantern sizes from 1000 × 1000 mm to 3000 × 4000 mm, how to choose one for your room and when made-to-measure is worth it.
6 min read →
How much does a roof lantern cost in 2026?
Guide prices for supply-only roof lanterns by size, the cost of glass and colour options, upstands, vents and fitting, with VAT shown.
6 min read →
Do you need planning permission for a roof lantern?
When a roof lantern is permitted development and when it needs planning permission or listed building consent, across England, Wales, Scotland and Northern Ireland.
5 min read →
What building regulations apply to roof lanterns?
U-values, the 25% glazing guideline, replacement rules and structure: how building regulations apply to roof lanterns in each UK nation.
7 min read →
Which glass is best for a roof lantern?
Self-cleaning, solar-control, triple glazing and laminated glass compared, with what each costs and which rooms benefit most.
6 min read →
Will a roof lantern make my room too hot?
Why roof glazing gains heat, and the four things that keep a lantern room comfortable: glass, size, ventilation and shading.
5 min read →
Roof lantern, flat rooflight or roof window: which is better?
How roof lanterns, flat rooflights and pitched-roof windows compare on light, looks, cost, drainage and where each can go.
5 min read →
Aluminium or uPVC roof lantern: which should you buy?
Sightlines, colours, sizes, lifespan and price: an honest comparison of aluminium and uPVC roof lanterns.
4 min read →
How should a roof lantern upstand be built?
Height, size, insulation and waterproofing: what a roof lantern kerb needs, and the difference between timber kerbs and insulated upstands.
6 min read →
How is a roof lantern fitted?
A step-by-step outline of fitting a roof lantern to a ready upstand, from delivery checks to the final weathertight check.
5 min read →
Should you replace or repair an old roof lantern?
Leaks, discoloured polycarbonate and condensation: how to tell whether to repair or replace, and what replacing on the existing kerb involves.
5 min read →
Why does my roof lantern get condensation?
Why condensation forms on lanterns, why new extensions are worst in the first year and the practical steps that reduce it.
5 min read →How do you clean and maintain a roof lantern?
Safe cleaning methods for self-cleaning glass and powder-coated frames, and a simple yearly check that keeps a lantern weathertight.
4 min read →
What happens when a roof lantern is delivered?
Pallets, weights, unloading, checking for damage and storing a lantern on site until it is fitted.
4 min read →
Do you need an opening vent in a roof lantern?
When an opening vent is worth having, how electric vents and rain sensors work and how lantern ventilation fits with building regulations.
4 min read →