No local rulebook, so the national limits carry the weight
Plenty of councils publish a householder design guide with their own depth limits and angle tests. Rugby Borough Council doesn't. Its list of supplementary planning documents covers air quality, shopfronts, housing needs, Rugby Central and the South West Rugby masterplan and design code, but nothing written for people adding a room to a house. When an application goes in, the officer works from the Local Plan adopted in June 2019 and national policy.
That puts more weight on the national permitted development rules. Outside a conservation area, a single-storey rear addition can usually go 3m past the original back wall of a semi or terrace, or 4m on a detached house, at no more than 4m high. The neighbour consultation route stretches that to 6m or 8m, and the council has 42 days to object. Go to two storeys and the limits tighten to 3m deep, at least 7m from the back boundary. A side addition must be single storey and no wider than half the original house.
One local check before you rely on any of that. The council's Article 4 list holds five directions. The HMO one covers central wards and stops houses becoming small shared lets without permission. The others sit on land at Barnacle and Willoughby. None is described as removing householder extension rights. On the big new estates, though, read the original planning consent on the register, because conditions there can do what an Article 4 direction does.
Matching the build to the house
Our view of how each type suits Rugby, with a full guide behind every one.
Single-storey rear. The obvious first move for a Hillmorton Paddox house from between the wars or a Brownsover house from the 1970s. Stay inside 3m and 4m high and there's no application at all, only Building Regulations approval.
Kitchen. The usual reason for building at the back. Rooflights over the new part keep windows from facing next door's garden.
Side return. Suits a Victorian terrace in the older streets near the centre, where a narrow passage runs beside the back addition. It counts as a side extension, so in a conservation area it needs planning permission.
Open plan. Taking out the old back wall needs a steel beam an engineer has sized. Warwick Building Control, the service Rugby shares with Warwick District Council, signs it off.
Two-storey. Over the drive of a semi this nearly always means a full application. With no local guide setting gaps, look at what neighbours on your road were allowed before you brief a designer.
Wrap-around. The side leg takes it out of permitted development, so plan on an application.
Downstairs bedroom. A level-access bedroom and shower room behind a bungalow or semi lets a parent stay put. Keep it joined to the house so it is plainly part of the home.
Home office. With Euston under an hour away by train, lots of people here split the week. An attached study shares the house's heating and broadband, which a cabin at the end of the garden doesn't.
Planning. In any of the borough's 19 conservation areas you lose side extensions, two-storey rear additions and cladding as of right, and the 6m or 8m route is gone too. Search your road on the Agile planning register first.
Cost and value. No prices here. Clay plain tiles in Bilton, flood resilience by the Swift and footings near a protected tree all change a quote. Get three builders to see your house.
Swift, Avon and what lies under the footings
Two rivers set the flood question in town. The Environment Agency runs a flood warning area for the Swift covering Brownsover Road and Swift Park, and another for the Avon around Boughton Road, Fosterd Road and Newbold Road, with Grange Road, Main Street and Parkfield Road in Newbold. If you live near either, look up your house on the flood map. In Flood Zone 2 or 3 any extension application needs a flood risk assessment. For a householder job the Agency's standing advice says floor levels should sit at least 600mm above the estimated flood level, or the build should use flood-resistant materials and measures instead.
The ground is mixed. The British Geological Survey names the country between Coventry, Rugby and Leamington as the type area for the Wolston Formation, a spread of tills, sands, gravels and laminated clays. Around Newbold and the Parkfield Road quarry the Blue Lias comes up, bands of limestone and mudstone that once fed the cement works. Your building inspector decides the foundation depth once the trench is dug.
Trees can change that depth. The council asks you to check with it before any work to a tree, and its protected trees are listed in a public dataset. If a tree near the new footings is covered by an order or stands in a conservation area, ask before you dig.
Bilton, the school streets and the other protected areas
Seven of the borough's conservation areas are in or on the edge of town: Rugby Town Centre, Rugby School, Clifton Road with Hillmorton Road and Whitehall Road, Bilton, Bilton Road, Hillmorton Locks and Old Brownsover. Twelve more lie out in the villages, Dunchurch, Wolston and Brinklow among them.
The Bilton appraisal is the most useful read for anyone extending there. Red brick dominates, with whitewash on older houses, and the dark small clay plain tile is the commonest roof. It wants applications drawn at 1:50 with a Design and Access Statement. Match the brick and the tile on the new part. Concrete tiles are the thing the appraisal complains about.
Out in the borough's Green Belt, national policy allows an extension only if it isn't disproportionate to the original building, and earlier additions count. Rugby publishes no percentage, so the planning register for your village is the best guide to what gets through.
Where these facts come from
- Rugby Borough Council: supplementary planning documents
- Rugby Borough Council: Article 4 directions
- Rugby Borough Council: conservation areas
- Rugby Borough Council: Bilton character appraisal
- Rugby Borough Council: tree preservation orders
- Rugby Borough Council: Warwick Building Control
- Rugby planning applications search
- GOV.UK: householder permitted development technical guidance
- Environment Agency: flood risk standing advice
- Environment Agency: River Swift at Rugby flood warning area
- Environment Agency: River Avon at Rugby and Newbold flood warning area
- British Geological Survey: Wolston Glacigenic Formation
- GOV.UK: NPPF, protecting Green Belt land
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Questions people in Rugby ask
Does Rugby have a 45-degree rule like other councils?
Not in a published guide. Rugby Borough Council has no householder design document, so there's no local angle test or depth figure to design to. Officers judge the effect on neighbours case by case under the Local Plan, which is why approved schemes on your own road are worth looking up.
We back onto the Swift near Brownsover Road. What extra do we need?
Check the flood map for your address. If you're in Flood Zone 2 or 3, the application needs a flood risk assessment, and the Environment Agency's standing advice for small extensions sets out the floor levels and flood resistance it expects.
We're in the Bilton conservation area. Can we build out to the side?
Only with planning permission. Conservation areas lose the permitted development right for side extensions, and two-storey rear ones too. Expect the council to want brick and clay tile that match the house.
There's a big tree by our back fence. Does it matter?
It might, twice over. It may be protected, so check with the council before cutting roots or branches. And it can push the foundations deeper, which the building inspector will judge on site.