How much does planning permission really cost in Bromley?

The headline fee sounds simple enough: £258 for a householder planning application in Bromley. But that number is just the starting point — and for many homeowners in BR1 to BR7, SE6, SE9, and SE20, the actual cost of getting permission is considerably harder to pin down. Tools like WhatCanIBuild exist precisely because the gap between "what's the fee" and "what will this actually cost me" is wider than most people expect.

The £258 is just the beginning

The application fee is fixed. Everything around it isn't.

If your application is submitted through the Planning Portal and attracts a fee over £100, there's also a service charge of £75.83 + VAT on top. That's before you've paid anyone to draw up plans, write a supporting statement, or handle the submission itself.

Most homeowners underestimate how much professional preparation adds up. Architects, planning consultants, structural engineers — depending on your project, you may need one, two, or all three. And if your application is refused and you need to resubmit or appeal, those costs don't stop.

Worth knowing: if your project relates to a listed building or a relevant demolition in a conservation area, no application fee is required — but that doesn't mean the process is cheaper overall.

Bromley isn't a uniform borough

This is where it gets complicated for Bromley specifically.

Bromley has significant Green Belt and Metropolitan Open Land. It has conservation areas. It has streets covered by Article 4 directions, which remove permitted development rights that homeowners on other streets take for granted. Some properties are listed buildings. Some sit in flood zones.

Each of these layers changes what you need, what you can do, and what it might cost to do it properly. A project that's straightforward on one street in Beckenham might require specialist reports and additional surveys three roads away.

Most homeowners don't realise that two identical extensions can have completely different planning outcomes — and completely different costs — depending on which side of an invisible boundary the property sits.

The cost of getting it wrong

Submitting the wrong application type, paying the wrong fee, or going ahead with work that actually needed permission — all of these have consequences that cost far more than the original application would have.

Local planning authorities won't refund your fee if you submitted a valid application and then withdraw it, or if the authority fails to determine it in time. Guessing at which category your project falls into isn't a saving — it's a risk.

And Bromley's decision time runs to around 8 weeks. If you've got the wrong application, you've lost 8 weeks and you're starting again.

What actually determines your costs

The honest answer is: your property determines your costs. Not the borough average, not your neighbour's experience, not what worked for someone in a Facebook group.

The best way to understand what applies to your specific address — what constraints are active, what similar projects nearby have cost in approvals and refusals, and what your actual approval odds look like — is to use WhatCanIBuild. It looks at your property's specific combination of constraints and shows you what's been approved and refused nearby, so you're not budgeting in the dark.

That's the kind of detail this article deliberately can't give you — because it depends entirely on where you live.

Enter your Bromley address and see what WhatCanIBuild surfaces about your property before you spend a penny.