Guides

An Article 4 direction withdraws permitted development rights — it cannot make reglazing into development. Four real directions quoted, and how to check yours.

Abolished in England on 1 October 2013, and in no UK nation did it ever cover windows — it controls demolition. The legislation, and what you actually need.

Conservation area status does not by itself remove your right to replace windows. An Article 4 direction does — and reglazing may need no permission at all.

A flat in England has no permitted development rights for windows. That is not the same as always needing permission — which is why reglazing matters here.

Nothing in UK planning law bans it. Replacing only the glass in an existing sash may not be development at all, and in England is outside Part L as well.

It affects only the interior, so it is not development — and Historic England says it rarely needs listed building consent. Up to 88% less heat loss.

Ten systems measured in situ by a UK heritage body came in at 1.0–2.8 W/m²K, most near 2.0 — so the widely quoted 1.6 sits at the bottom of the real range.

Thin enough to reglaze an existing sash — though the edge seal still sets the rebate. Historic England has not approved it; it approves no products. What the guidance says.

Overhaul and draughtproofing need no permission on an unlisted English house, and reglazing usually does not either. New sashes in the retained box frame win.

Timber applications are refused on millimetres, drawings and the absence of a condition survey — not on the word 'timber'. The detail officers assess.

Not banned: the GPDO conservation area restriction says nothing about windows. But 48 of 56 listed-building uPVC appeals decided on merits were dismissed.

Listed building consent asks whether works affect the building's character — no visibility test, no materiality test. Free to apply for, criminal to skip.

English guidance is not safe elsewhere. Scotland gained a dedicated window PD class on 24 May 2024; Wales replaced its heritage statute in November 2024.

In England, Approved Document L sets 1.4 W/m²K or WER Band B for a replacement window. Regulation 21(3)(a) can disapply that conditionally; reglazing is outside Part L entirely.

Indicative UK prices for repairing, draughtproofing, reglazing and replacing period windows — each with its source and date, and the costs nobody quotes for.

Which application to make, the fee, and the drawing standard that decides validation — 1:1 joinery sections in some boroughs, 1:5 in others.

The four-year rule is not a conservation area rule. England moved to ten years on 25 April 2024; Wales is still four; a listed building has no limit at all.