Somerset looks like peaceful countryside, but its planning rules are anything but simple. With national park boundaries, multiple AONBs, 178 conservation areas, and over 5,000 listed buildings all overlapping in complex ways, what's fine for your neighbour might need full planning permission for you. WhatCanIBuild cuts through that complexity by looking at what actually applies to your specific address.
The short version
- Somerset has 178 conservation areas and over 5,000 listed buildings — heritage restrictions are widespread
- Properties near Exmoor, Mendip Hills, Quantock Hills, and other AONBs face restricted permitted development rights
- Rules vary street by street, and sometimes property by property
- A £548 application fee is at stake if you get it wrong
Somerset isn't one place — it's dozens of planning environments
Most homeowners assume Somerset is broadly rural and therefore relaxed about planning. That assumption catches people out constantly. The county borders or partially overlaps Exmoor National Park and five separate AONBs — the Blackdown Hills, Cotswolds, Cranborne Chase, Mendip Hills, and Quantock Hills. Properties near those boundaries sit on what's known as Article 1(5) land, where permitted development rights are significantly restricted.
What does that mean for your extension, outbuilding, or new window? It depends entirely on where your property sits in relation to those boundaries — and most homeowners don't realise they're affected until after work has started.
Conservation areas are everywhere in Somerset
178 conservation areas is a lot. That's not a handful of historic town centres — that's coverage across a huge number of streets, villages, and rural settlements throughout the county. Inside a conservation area, things that would normally be permitted development — cladding, roof alterations, certain extensions, even some fences — may need full planning permission.
But here's what trips people up: being inside a conservation area doesn't tell you what you can and can't do. The specific constraints depend on what's in the conservation area appraisal, what Article 4 directions are in place, and how Somerset Council has applied restrictions in your particular location. Two houses on the same street can face different rules.
Listed Buildings
If your property is one of Somerset's 5,000+ listed buildings, or even adjacent to one, the rules change significantly. Listed building consent is a separate regime from planning permission entirely — and most homeowners don't know they need it until it's too late.
The projects people assume are fine — and aren't
Loft conversions, rear extensions, garden offices, driveways, solar panels — these are the projects Somerset homeowners most commonly assume fall under permitted development. Sometimes they do. But whether yours does depends on a combination of factors: your property's size and type, what's already been built, which designations apply to your address, and whether any Article 4 directions have removed permitted development rights in your area.
Most homeowners don't realise that permitted development rights can be removed from individual properties or entire streets through planning conditions attached to the original build. You'd have no way of knowing that without checking.
What the approval picture actually looks like near you
Knowing you're in a conservation area is one thing. Knowing what that means for a two-storey side extension on your specific street — what's been approved nearby, what's been refused, and what the sticking points were — is something else entirely. That's what WhatCanIBuild surfaces: real approval and refusal data for your project type in your area, so you're not guessing.
The best way to know what applies to your Somerset property isn't to work through general guidance — it's to check your actual address. WhatCanIBuild tells you what your specific combination of constraints means for your project, what's been approved and refused nearby, and whether you're likely to need permission before you spend a penny.
These rules vary by property
Conservation areas, Article 4 directions, and other constraints can change everything. Check what actually applies to your address.
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