How much does planning permission really cost in Lewisham?

Most homeowners in Lewisham start by googling the application fee and assume that's the cost. It isn't. The £548 is just the entry ticket — and depending on where your property sits, what it's attached to, and what's happened on your street, the total picture looks very different until you see what applies to your exact address — free, in about a minute.

The £548 is the floor, not the ceiling

The government-set fee for a householder application — covering things like extensions, loft conversions, and outbuildings — is £548 in Lewisham, as it is across England. Pay it and your application gets registered. That part is straightforward.

What isn't straightforward is everything else. Most homeowners also end up paying for:

• Architectural drawings — Lewisham won't accept a napkin sketch. You'll need scaled plans, and they need to be accurate.
• Pre-application advice — Lewisham Council offers a paid pre-app service. It's optional, but for anything in a conservation area or near a flood zone, skipping it can be expensive if your application fails.
• Planning consultant fees — if your property has complications (and many in Lewisham do), a consultant can be the difference between approval and refusal.

A refused application doesn't get a refund. A resubmission within 12 months is free, but the cost of revised drawings and further advice is not.

Lewisham's constraint mix is unusually varied

This is where it gets genuinely complicated. Lewisham spans everything from dense Victorian terraces in Brockley and New Cross to suburban streets in Lee and Grove Park. Conservation areas in Blackheath, Telegraph Hill, Brockley, Lee Manor, and Forest Hill each have their own character appraisals and sensitivities.

Article 4 Directions in several of those Victorian conservation areas remove permitted development rights for window and door alterations — meaning works that would be free and automatic elsewhere in London require a full application in Lewisham. Most homeowners don't realise their property is affected until they've already ordered the windows.

Then there's the flood risk question. Properties near the Ravensbourne and Quaggy rivers face restrictions that don't apply a street away. The permitted development classes for outbuildings don't work the same way for riverside plots — and whether that flood zone restriction actually affects your specific property isn't something you can answer by looking at a postcode map.

The cost you can't see: approval odds

The fee, the drawings, the consultant — those costs are visible. The hidden cost is time and money spent on a project with poor odds of approval.

Lewisham's planning committee and delegated officers have a track record. Certain project types in certain streets get approved consistently. Others don't. The difference is often in the detail — how your property's specific combination of constraints interacts with what officers have accepted or refused nearby.

That's the cost calculation most homeowners miss entirely. Before you spend anything, the best way to understand your real position is to see the approval record for your street and what it means for your odds — free, no signup needed.