Rendering and insulation in Brighton’s conservation areas

Updated November 2026

Why this matters in Brighton and Hove

Brighton and Hove City Council lists 34 conservation areas across the city, covering everything from Regency squares and crescents on the seafront to Victorian streets, old village centres such as Rottingdean, Ovingdean and Preston Village, and much of the North Laine. On top of that, the council lists 49 Article 4 directions, most of them used to protect the character of a conservation area, and the city has a large number of listed buildings.

If you live in one of these areas, changes to the outside of your house that would be routine elsewhere can need permission. Rendering, re-rendering, cladding, external wall insulation and even repainting the front of the house in a new colour are among the most common.

Rendering and cladding

Outside conservation areas, the Planning Portal says rendering may fall under permitted development, provided the materials are of a similar appearance to those used on the house. Inside a conservation area, it is stricter: you need to apply for planning permission before cladding the outside of your house. Listed buildings need listed building consent for any significant works, inside or out.

The council’s guidance on external paint finishes also says the retention of smooth painted stucco on Regency and early Victorian buildings is essential, and that fair-faced brickwork and flint which were meant to be seen should never be rendered or painted over. It also advises against modern textured or high build coatings on historic buildings.

Painting the outside of your house

Where an Article 4 direction is in force, planning permission is usually needed for minor changes that would normally be allowed, including painting the outside of a building. These directions mostly cover the street-facing fronts of single family houses.

The council’s colour guidance recommends a palette of whites, pale creams and pale fawns for the painted fronts of 19th century historic buildings, and says intense, dark or primary colours are normally resisted on listed buildings and in conservation areas. Its residents’ guide adds that permission is not needed to repaint in exactly the same colour as before.

Some directions are very specific. The Clifton Terrace Article 4 direction, for example, requires render and garden walls to be white, British Standard colour BS 00 E 55, with a gloss or smooth masonry paint finish.

External wall insulation

Many period homes in the city have solid walls that lose a lot of heat, so external wall insulation is tempting. In a conservation area, though, the Planning Portal says you will need to apply for planning permission, and adding insulation to the front of a historic terrace changes its depth, its details and how it lines up with its neighbours.

Historic England describes internal and external wall insulation as technically complex measures, and warns that highly vapour-resistant materials risk trapping moisture in solid walls. Options that are often more realistic for period homes include:

• insulating only the rear or side walls, which are less visible from the street;
• breathable internal insulation designed for solid walls;
• repairing and replastering in lime, which helps solid walls stay drier;
• draught-proofing windows and doors and insulating lofts and floors first.

We are happy to talk through what might work, but for anything that changes the outside of a house in a conservation area, the council’s planning team will have the final say. Our external wall insulation page explains how EWI works.

Building Regulations still apply

Separate from planning, the Planning Portal says that where 25 per cent or more of an external wall is re-rendered, re-clad, re-plastered or re-lined, Building Regulations would normally apply and the wall’s insulation would normally have to be improved. If meeting the full standard is not practical, the guidance allows the best standard that pays back within 15 years. Simply redecorating a wall does not normally need approval.

On a historic building, insulation upgrades have to be balanced against the need for the wall to stay breathable, which is another reason to talk to Building Control and a conservation officer early.

Why lime matters on period houses

Most of the city’s Regency and Victorian houses were built with lime mortars, renders and plasters. SPAB explains that lime lets old buildings breathe and move gently, while cement, gypsum and plastic paints can harm historic fabric. Hard cement render on an old wall can crack and trap moisture behind it, which is a common cause of damp in period homes.

Using lime for repairs and limewash or other breathable paints is usually welcomed by conservation officers and better for the building. Our lime plaster guide explains why, and our lime plastering service covers repairs and replastering in period homes.

Before you start: a quick checklist

1. Check whether your home is listed on the National Heritage List for England.
2. Check whether it is in a conservation area and whether an Article 4 direction covers your street, using the council’s conservation area and Article 4 pages.
3. If you plan to render, clad, insulate or change the colour of the outside, contact the council’s planning team before booking any work.
4. If you are re-rendering or re-plastering a quarter or more of a wall, ask whether a Building Control application is needed.
5. Choose breathable, traditional materials for repairs to older walls.