Most homeowners searching for planning costs in Somerset land on one number: £548. That's the householder application fee. It's real, it's official, and it tells you almost nothing about what your project will actually cost — or whether it'll be approved at all.
Somerset's planning landscape is genuinely complicated. With 178 conservation areas, over 5,000 listed buildings, and multiple AONBs pressing against its boundaries, the variables that affect your project aren't obvious from a postcode. WhatCanIBuild was built for exactly this kind of complexity — telling you not just what constraints exist on your property, but what they've meant for similar projects nearby.
The short version
- The householder application fee in Somerset is £548
- That fee doesn't include pre-application advice, drawings, agent fees, or resubmission costs
- Somerset has 178 conservation areas and 5,000+ listed buildings — your property's history matters
- The real question isn't what the fee is. It's whether your application is likely to succeed.
The £548 is just the starting point
The application fee is set nationally. But the costs that follow — and the risks that multiply — are entirely local. Most homeowners don't realise that professional drawings alone can run into hundreds of pounds before you've submitted anything. Pre-application advice from Somerset Council isn't free either, and skipping it can mean submitting something that was never going to pass.
Then there's the Planning Portal service charge: £75.83 + VAT applies to all online applications with a fee over £100. Small, but it's another line most people don't see coming.
And if your application is refused? The fee isn't refunded. You resubmit, you pay again.
Somerset's geography quietly changes the rules
Somerset borders or partially overlaps Exmoor National Park and several AONBs — the Blackdown Hills, Cotswolds, Cranborne Chase, Mendip Hills, and Quantock Hills. Properties near those boundaries sit on Article 1(5) land, where permitted development rights are restricted in ways that don't show up on a simple postcode check.
That's before you factor in Somerset's 178 conservation areas. External alterations that would sail through in one street can require full planning permission two roads away. Most homeowners don't know which side of that line they're on until they've already made plans.
Don't assume permitted development covers you
Even if your project sounds simple — a rear extension, a loft conversion, a new window — your property's specific constraints can remove permitted development rights entirely. Somerset's heritage coverage is extensive enough that this catches people out constantly.
Listed buildings are a different cost conversation entirely
Over 5,000 listed buildings are recorded across Somerset. If yours is one of them — or if it's in the curtilage of one — you're not just dealing with planning permission. Listed building consent is a separate application, a separate process, and a separate set of costs. The application fee for listed building consent is zero, but the specialist advice, heritage statements, and specialist contractors that typically come with it are not.
The combination of a listed building in a conservation area near an AOB boundary isn't rare in Somerset. It's entirely possible your property sits at exactly that intersection, and the implications for your project are things no general article can tell you.
What actually determines your costs
The fee is fixed. Everything else — approval odds, likely objections, what similar projects on your street have experienced — varies property by property. WhatCanIBuild shows you what's been approved and refused near you, what constraints are stacked against your specific address, and what that combination actually means for your project's chances. That's the information that determines whether your £548 is money well spent or the first of several.
Typical decision time in Somerset is 8 weeks. That's 8 weeks after submission — before which you need drawings, potentially pre-application advice, and the confidence that what you're submitting has a realistic chance.
The best way to understand what your project is really up against is to check your specific address before you spend anything.
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