Do You Really Need Planning Permission for Secondary Glazing?

Secondary glazing is installed inside the original window reveal, so it usually has less planning impact than replacing external windows. The correct consent depends on the building and the proposed work.

Ordinary properties

Internal secondary glazing typically does not require planning permission. Check local requirements before work begins, particularly where external alterations or access scaffolding are involved.

Listed buildings and conservation areas

Listed building consent or conservation guidance may apply even when the original windows are retained. A reversible internal system can be a suitable option, but the local planning authority and conservation officer should confirm the position for your property.

Explore our listed-building solutions or request a heritage survey before committing to work.