Planning Permission in Blackheath: A Homeowner's Guide

Blackheath falls within the London Borough of Lewisham and the Royal Borough of Greenwich, and because a meaningful part of the area sits inside the Blackheath conservation area - London's first, jointly designated by both boroughs in 1968, planning rules here are a little more involved than in a typical suburb. This is a general guide, not planning advice for your specific property - always check with the council or a qualified professional before committing to a design.

Permitted development: what you usually don't need permission for

• A single-storey rear extension within standard size limits (these limits are tighter for terraced and semi-detached houses)
• A loft conversion using dormers that don't face the principal road, within a set additional roof volume
• Most internal alterations that don't affect structural walls
• A porch below a certain size, subject to distance from the highway

Where conservation area status changes things in Blackheath

If your property sits within the Blackheath conservation area - London's first, jointly designated by both boroughs in 1968, several permitted development rights are commonly restricted or removed altogether - this can include cladding, painting brickwork, replacing windows and doors with anything other than a matching style, and some roof alterations that would otherwise be permitted. It's genuinely worth checking your property's exact conservation area status with the London Borough of Lewisham and the Royal Borough of Greenwich before finalising any design, since the boundaries can be street-specific.

Listed buildings

A smaller number of buildings in and around Blackheath, particularly near The Paragon and Blackheath itself, carry statutory listed status, which requires Listed Building Consent for almost any alteration - inside or outside - regardless of whether the change would normally need planning permission. Altering a listed building without consent is a criminal offence, so this is one area where it always pays to check first.

Getting it right

A builder who works regularly on Blackheath's streets will usually have a good instinct for what the London Borough of Lewisham and the Royal Borough of Greenwich's planning department will and won't accept, even before you get to a formal pre-application check - it's one of the reasons local experience is worth as much as price when you're comparing quotes for anything beyond internal work.