What are the most common reasons planning applications get refused in Lewisham?

Spending £548 on a planning application only to get refused is painful — and it happens more often than most Lewisham homeowners expect. The tricky part isn't understanding the general rules. It's knowing which rules apply to your exact property, on your exact street, in your exact part of the borough.

Character and appearance: the catch-all refusal

The most cited reason for refusal across Lewisham — and across London generally — is that a proposal harms the character or appearance of the area. That sounds vague, because it is. What "character" means in Forest Hill is not what it means in Deptford. What's acceptable on a suburban street in Lee Manor may be flatly refused on a Victorian terrace in Telegraph Hill or Brockley.

Conservation areas in particular come with expectations that most homeowners underestimate. Lewisham has them in Blackheath, Telegraph Hill, Brockley, Lee Manor, and Forest Hill — and the detailed guidance varies between each one. Being inside a conservation area boundary doesn't tell you what you can or can't do. What matters is how your specific proposal sits within that specific area's character appraisal.

Most homeowners don't realise this until after they've submitted — or been refused.

Article 4 Directions: when permitted development doesn't apply

Here's where Lewisham gets genuinely complicated. Several of the borough's Victorian conservation areas have Article 4 Directions in place, specifically restricting changes to windows and doors. Work that would normally fall under permitted development — meaning no planning application required — suddenly needs full permission.

If your property sits within one of these areas, you might assume a like-for-like window replacement is straightforward. It might not be. The wrong material, profile, or style can trigger a refusal. And if you didn't know you needed permission in the first place, you could already be in breach.

The best way to know whether an Article 4 Direction affects your property is to check what constraints are actually attached to your specific address — because your neighbour's house and yours can be treated very differently.

Flood zones and riverside properties

The Ravensbourne and Quaggy rivers run through the borough, and properties near them sit in flood zones that restrict what can be built — particularly outbuildings and extensions that would otherwise be routine. Most homeowners in SE6, SE12, and SE13 don't know whether their garden falls within a flood risk area until they've already started planning.

Neighbour impact: overlooking, light, and bulk

Even where conservation and flood constraints don't apply, applications fail on impact grounds — loss of light to neighbouring windows, overlooking, or a proposal that feels too bulky relative to the host property. Officers apply these tests differently depending on density, plot size, and the established pattern of development in your immediate area. What passed on a detached plot in the south of the borough may be refused on a terraced street in the north.

What this means for your application

Refusals in Lewisham rarely come down to one thing. They come down to your specific combination of constraints — and whether your proposal fits the pattern of what's actually been approved nearby. Knowing you're in a conservation area is one thing. Knowing what that conservation area's approval history looks like for your project type is something else entirely.

With WhatCanIBuild, you can see what's been approved and refused near your street, and what that means for your odds — free, no signup needed.