Quick Answer

Standard Houses: The General Rule

Under the Town and Country Planning Act 1990, “development” that requires planning permission includes operations that materially alter the external appearance of a building. In practice, however, applying render or cladding to an existing residential building is not considered development requiring planning permission for most houses — it’s maintenance or improvement of the existing structure.

The key distinction is between works that alter the external appearance versus works that are genuinely materially different from the existing character. Re-rendering a rendered house, applying brick slips to a brick house, or adding external wall insulation with a render finish are all typically within the scope of maintenance and don’t need permission.

Conservation Areas

Conservation areas and other designated land are the most significant exception. Under the householder permitted development rules (Class A, paragraph A.2(a)), cladding any part of the exterior of a house on this land with stone, artificial stone, pebble dash, render, timber, plastic or tiles is not permitted development — it needs planning permission, with or without an Article 4 Direction.

Councils can also use Article 4 Directions to remove other rights for external alterations, so check with your council before changing finishes in a conservation area. Many conservation area appraisals specifically mention that the use of particular materials (such as timber cladding or UPVC) is inappropriate to the area’s character.

Listed Buildings

For listed buildings, any works that would affect the character of the building as a building of special architectural or historic interest require listed building consent. Applying render to a stone listed building, cladding over the original brickwork, or painting a listed building’s exterior for the first time all require listed building consent in addition to any planning permission required.

In most cases, applying modern materials over historic fabric is resisted by conservation officers. Exceptions exist for reversible treatments or where there is a compelling reason such as carefully designed energy efficiency improvements.

Types of Cladding and Render

Building Regulations

Regardless of whether planning permission is needed, external wall cladding must comply with Building Regulations — particularly Part B (fire safety) and Part L (thermal performance).

Fire safety (Part B)

The Grenfell Tower fire led to significantly tightened rules on combustible cladding. For buildings over 18 metres, the external wall system must be A1 or A2 rated (non-combustible or limited combustibility). For lower-rise buildings, the cladding system must still be assessed for fire spread.

Thermal performance (Part L)

If you’re adding external wall insulation, the insulation must meet current thermal performance standards. Reputable EWI installers will submit a Building Regulations application as part of their service — make sure you receive a completion certificate.