What permitted development actually allows
Permitted development rights let homeowners put up certain outbuildings, including garden rooms, without a full planning application — provided the building stays within limits on height, how much of the garden it covers, and how close it sits to a boundary. The government sets these out in its guidance on permitted development rights for householders.
The limits are stricter for buildings within two metres of a boundary, and there's an overall cap on how much of the garden can be covered by outbuildings once you add up everything already there.
When the rules tighten
Permitted development rights are commonly restricted or removed entirely for listed buildings, for homes in a conservation area, and for land inside the New Forest National Park, where the New Forest National Park Authority is the planning authority rather than the district council. If your home falls into any of these categories, check before ordering a design.
They can also be restricted if a previous owner used up permitted development rights on an earlier extension or outbuilding, or if the property has a planning condition removing them — something a search of past applications on the council's website will usually show.
Which council covers your address
Planning in this part of Hampshire is split between several authorities: Test Valley Borough Council covers Romsey itself and most of the surrounding villages, Eastleigh Borough Council covers Eastleigh and most of Chandler's Ford, New Forest District Council covers Totton and the built-up area around it, and Southampton City Council is a separate unitary authority for the city itself.
Land within the New Forest National Park — including some villages to the west and south-west of Romsey — is a separate case again, decided by the New Forest National Park Authority rather than the district council. It's worth double-checking which authority applies to your specific address, since parish boundaries don't always match what people expect.
If you do need an application
Where a full application is needed, most councils publish pre-application advice services that let you check a proposal informally before submitting anything formal, which can save time if there's any doubt about whether a design fits the site.
Applications, guidance and forms for most councils are accessible through the national Planning Portal, alongside each council's own website.
Frequently asked questions
How do I check if my garden room needs planning permission?+
Start with your council's planning guidance pages, or use a pre-application advice service if one is available. The answer depends on your specific plot, not just the size of the building.
Does a garden room near my boundary need planning permission?+
Buildings within two metres of a boundary have a lower permitted height limit than those set further back, so proximity to a boundary is one of the first things to check.
Is planning different inside the New Forest National Park?+
Yes — the New Forest National Park Authority is the local planning authority for land within the Park, rather than the district council, and permitted development rights are often more restricted there.
Who do I contact if I'm not sure which council covers my house?+
Your council can usually be confirmed via your postcode on the relevant local authority's website, or by checking recent planning applications for your street.
Useful local links
- Test Valley Borough Council — Planning Permission and Pre-Application Advice — The local planning authority for Romsey and most of the surrounding villages covered by this site.
- New Forest District Council — Planning Guidance for Householders — Covers Totton, Testwood and Calmore for planning purposes.
- Southampton City Council — Planning Permission — The separate unitary authority covering the city of Southampton.
- New Forest National Park Authority — Planning — The local planning authority for land within the New Forest National Park, including Copythorne and Newbridge.
- Planning Portal — Outbuildings — National guidance on permitted development for garden buildings.