Most homeowners in Merton start their planning research by Googling the application fee. They find a number — £548 for a householder application — and assume that's roughly what they're in for. It usually isn't, and the gap between that number and your actual total depends almost entirely on your specific property, not the borough average. Until you see what applies to your exact address before you commit to anything — free, takes about a minute, you're budgeting blind.
The short version
- The householder planning application fee in Merton is £548
- That figure doesn't include pre-application advice, drawings, planning consultants, or structural reports
- Merton has conservation areas, Article 4 Directions, and listed buildings that can add significant cost and complexity depending on your property
The £548 is just the starting gun
The application fee is set nationally and doesn't vary by borough. What varies enormously is everything around it. Depending on your project, you may need professionally drawn plans, a heritage statement, an arboricultural report, or a design and access statement — none of which are included in the fee. Some homeowners in Merton spend more on getting their application ready to submit than on the fee itself. Others don't. The difference comes down to what your property is, where it sits, and what your project involves.
Merton Council also offers pre-application advice — a paid service that lets you test your proposal before submitting. Whether it's worth the cost depends on how confident you are about approval, which is a harder question than it sounds.
Merton's constraints change the calculation
Merton isn't a uniform borough. Wimbledon Village and Wimbledon Common have Article 4 Directions in place, which means permitted development rights that exist elsewhere in the country may not apply to your property. Cannizaro Park, Mitcham Cricket Green, and Merton Abbey Mills sit within conservation areas. Listed buildings cluster around Wimbledon Common. Near Wimbledon Common itself, Metropolitan Common Land byelaws add another layer that most homeowners don't even know to ask about.
None of this means your project will be refused. But each of these designations can change what you need to submit, how much preparation costs, and what the likely outcome is. A loft conversion on a standard Edwardian semi in SW19 is a very different proposition from the same project two streets away if those streets fall under different constraints. The best way to understand how your property's specific mix of designations affects your odds is to check what those overlapping constraints actually mean for your project type.
Don't assume your neighbours' experience applies to you
A similar extension approved next door doesn't guarantee yours will be too. Conservation area boundaries, Article 4 Directions, and listed building curtilages can differ street by street — even plot by plot.
What refusals cost you
This is the part of the budget most people ignore entirely. If your application is refused, you lose your fee — there's no refund. You can appeal, but appeals take time and often involve professional costs that dwarf the original application fee. The homeowners who avoid this outcome tend to be the ones who understood their approval odds before submitting, not after.
Merton's decision timeline runs to roughly 8 weeks for householder applications. That's 8 weeks of uncertainty if you've submitted without a clear read on your chances.
The real cost of planning permission in Merton isn't the £548. It's the combination of preparation costs, constraint-specific requirements, and the risk of refusal — all of which vary by address. WhatCanIBuild pulls together the approval record for your street and similar projects nearby so you can see what's been approved close to you and what your actual odds look like — free, no signup needed.
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