The headline fee for a householder application in Merton is £258. Most homeowners stop there — write the cheque, submit the forms, and assume that's the hard part done. It isn't. The real question isn't what the fee is. It's whether that fee is even the right one for your project, and whether your property sits in one of the many parts of Merton where the rules change entirely. WhatCanIBuild exists precisely because those questions don't have a single answer.
The short version
- The standard householder application fee in Merton is £258 — but additional costs can stack up quickly depending on your project and property
- Merton has conservation areas, Article 4 directions, and Green Belt land that all affect what you can build — and what it costs to find out
The £258 is just the beginning
On top of the application fee, Planning Portal charges a service fee of £75.83 + VAT for applications submitted online that attract a fee over £100. That's before you've paid an architect to draw up plans, a planning consultant to advise you, or a specialist to produce any supporting reports your application might require — think heritage statements, tree surveys, or flood risk assessments. None of that is included. None of it is optional if your local planning authority asks for it. And most homeowners don't realise how quickly those extras mount up until they're already committed.
Where your address changes everything
Merton isn't a uniform borough. Wimbledon Village and Merton Park both have conservation areas. Article 4 directions apply in several of those areas, removing permitted development rights that homeowners elsewhere take for granted. The south of the borough edges into Green Belt. Depending on which postcode you're in — SW19, SW20, SM4, CR4, KT3 — the constraints on your property could be completely different from your neighbour two streets away.
That matters for cost because constrained properties often require more documentation, more specialist input, and sometimes pre-application advice from the council before you even submit. Pre-application advice isn't free. And if your application is refused and you need to appeal or resubmit, you're absorbing those costs again.
Don't assume your project is straightforward
Conservation area status, Article 4 directions, and proximity to listed buildings can all affect what you need to submit — and what you need to spend. These constraints apply at the individual property level, not just the street.
The cost of getting it wrong
An incorrect fee delays your application. A missing document means it's invalidated. A refused application means you've spent money on plans and fees with nothing to show for it — and now you're deciding whether to revise and resubmit, appeal, or walk away. Most homeowners don't realise that refusal rates vary significantly by project type and location. What sailed through for someone on a different street might face serious resistance on yours, for reasons that aren't obvious from the outside.
This is where knowing what's been approved and refused nearby — for projects similar to yours, on properties like yours — actually changes your decision-making. Not just whether you're in a conservation area (you can find that on the council website), but what that conservation area designation has actually meant for similar applications, and what your realistic approval odds look like before you spend a penny.
The best way to get that picture for your specific property is WhatCanIBuild — it shows you what's happened locally, not just what the rules say in theory.
So what will it actually cost?
It depends on your property. It depends on your project. It depends on whether your address sits inside one of Merton's conservation areas, whether Article 4 directions have removed your permitted development rights, and whether your application is the kind that local planners routinely approve or routinely push back on. The £258 fee is just the price of asking the question. WhatCanIBuild helps you understand what the answer is likely to be — before you commit to finding out the expensive way.
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