Outbuilding planning checklist
A checklist for garden rooms, sheds, studios, gyms and outbuildings before assuming permitted development applies.
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Use This Before The Project Becomes Expensive
This resource is designed for early planning decisions. It helps you name the issue, record the obvious checks and avoid paying for drawings, applications or contractor commitments before the planning route is clear enough.
Good use
Print it, mark it up, save the source links and use it as a short agenda for a council, designer, consultant or builder conversation.
Not a decision
It is not a formal certificate, approval, legal opinion or replacement for checking the exact property, council and design.
Best next step
Use the permitted development calculator when the checklist shows the route is still unclear or locally sensitive.
Work Through These First
- Confirm the intended use and whether it is incidental to the house.
- Check position, height, boundary proximity and whether it sits forward of the principal elevation.
- Calculate garden coverage and check previous outbuildings.
- Check conservation area, listed building, Article 4 and planning condition issues.
Outbuilding planning checklist
Tick these off on paper or copy the text into your project notes. Keep any official links, screenshots and dates with the project record.
Use and layout checks
- Describe the intended use in plain English: storage, gym, office, studio, sleeping, annexe or business.
- Mark the building on a simple site plan with boundaries and the house.
- Record overall height, eaves height, roof type and nearest boundary distance.
Risk checks
- Check whether the building could look like separate accommodation.
- Check whether services, kitchen, bathroom or sleeping use change the route.
- Check whether local restrictions make even a modest structure more sensitive.
Things Worth Avoiding
- Calling a building a shed when the use is really living accommodation.
- Ignoring height near boundaries.
- Forgetting that forward siting and site coverage can matter.
- Assuming a garden office is always treated the same way as storage.
Questions To Put To The Council Or A Professional
- Is the use clearly incidental to the main house?
- Is the height comfortable for the boundary position?
- Would a certificate or application be safer because of use or local sensitivity?
Official Sources Worth Opening Next
Use these as starting points and then check the relevant council page for the property. Rules, validation requirements and local controls can change by authority and site.
Pair This Planning Checklist With The Technical Evidence Route
This download helps with the planning-side decision. BuildingRegsGuide covers the building-control conversation, inspection stages and certificate evidence to keep once the project moves toward work.
Outbuilding building regulations
When an outbuilding, office or workshop moves from simple/exempt to building-control relevant.
Open sister guideCompletion certificate evidence
What completion evidence is for and why it can matter later for sale, remortgage or proof.
Open sister guideClean Citation Text
Use this when sharing the resource with a neighbour, designer, builder or adviser.
General Guidance Only
This checklist is for early route checking only. Outbuilding cases can turn on use as much as dimensions.
Before relying on a borderline route, confirm the latest position with official sources, the local planning authority or a suitable professional.