How much does planning permission really cost in Sutton?

The headline number for a householder planning application in Sutton is £258. Most homeowners stop there. That's usually a mistake.

What you actually pay — and whether your application succeeds — depends on a combination of factors that are specific to your property, not just your borough. WhatCanIBuild exists precisely because that combination is almost impossible to work out from general guidance alone.

The fee is just the beginning

Submitting through the Planning Portal attracts a service charge of £75.83 +VAT on top of your application fee — so you're already closer to £350 before anyone has looked at your plans. And if your application is refused, or you withdraw it, that money is gone.

Most homeowners don't realise that an incorrect fee will delay the processing of your application outright. Getting the fee wrong — because you've categorised your project incorrectly — is one of the most common reasons applications stall before they've even started.

What your address changes

Sutton isn't a uniform borough. There are Green Belt areas to the south. Parts of the borough sit within conservation areas. Some streets carry Article 4 directions. Some properties are listed. Some are in flood zones. Each of these can change what you need to apply for, how your application is assessed, and what your realistic chances of approval actually are.

The £258 fee applies to a standard householder application — but not every project fits that category. And not every property in SM1 is treated the same as one in SM5, SM6, or SM7. Even two houses on the same street can face completely different planning landscapes depending on their history and the constraints attached to their title.

The cost of getting it wrong

Here's what the fee calculator won't tell you: whether a project like yours has been approved or refused nearby, and why. Whether similar extensions on your street sailed through or got knocked back. Whether your specific combination of constraints — a rear extension, a side return, a converted loft — is something Sutton's planning team has historically waved through or consistently challenged.

That's not pessimism. It's the difference between an application that costs £350 and one that costs £350, a set of architect fees, a refusal, an appeal, and six months of your life.

The best way to understand what you're actually facing — not just the fee, but the approval odds, the nearby decisions, the property-specific constraints — is to check your address with WhatCanIBuild before you commit to anything.

Before you budget, check your property

Typical decision time in Sutton is 8 weeks. But that clock only starts once you've submitted a valid application with the correct fee and the right information. Most homeowners don't realise how many applications stumble before that clock even begins.

WhatCanIBuild shows you what's been approved and refused for properties like yours in Sutton — including the reasons behind those decisions — so you're not budgeting based on a number that only tells half the story.