Ninety-seven conservation areas, and what that does to a dormer
Start with the map, not the tape measure. Canterbury City Council looks after 97 conservation areas across the district. In and around the city they take in the walled centre, Whitstable Road, Nunnery Fields, Old Dover Road with Oaten Hill and St Lawrence, and even the 1937 Kent and Canterbury Hospital.
Under the national rules, a house in a conservation area loses the permitted development right to enlarge its roof. So a rear dormer or a hip-to-gable that would go ahead without an application in most of England needs full planning permission here. It makes no difference that the back of the house can't be seen from the street.
Some houses carry an extra layer. The council's heritage guidance records an Article 4 direction from 1985 covering about 1,200 unlisted buildings in the city conservation area, plus further directions in Whitstable and Herne Bay. Search your address on the council's planning register at pa.canterbury.gov.uk and look at what the neighbours were allowed. It's the best guide you'll get to what the planners will accept on your street.
Steep old roofs under red Kent peg
The council's own description of the city's historic roofs is short and useful. Mostly small in scale and steeply pitched, under red Kent peg tiles, with slate in the 19th-century streets. A steep pitch is good news for headroom. Small in scale is the catch, because a narrow old roof may only take a modest room.
Kent pegs are smaller than plain tiles in other parts of the country, with a warm orange-red colour that new concrete tiles never match. The council lists swapping clay or slate for concrete as one of the commonest ways old streets get spoiled. Ask any builder you're quoting where they'll get matching tiles, and whether they'll save and reuse the ones that come off.
The Victorian suburb along New Dover Road shows what the planners like. Its design guidance says the dormers there are "generally small and understated", with hipped or gabled roofs tiled to blend in. Treat that as the house style for most of the city's older streets.
One oddity belongs to Canterbury more than anywhere. In 1981, 138 of the 859 known English examples of mathematical tiles were in the city, mostly around the Buttermarket and Burgate. They're clay tiles hung on battens to look like brick, often over a timber frame. On a house like that, the engineer needs to know what the wall really is before anyone designs a steel to sit on it.
Building control is shared, not the council's own
Canterbury doesn't run building control on its own. It belongs to the STG Building Control Partnership with Medway, Swale and Gravesham. Insist on a completion certificate at the end and keep it with the deeds. A buyer's solicitor will ask.
The city centre has one rule you won't meet elsewhere. It's an Area of Archaeological Importance, designated in 1984 and one of only five in England and Wales. A loft rarely touches the ground, but if the job needs a new drain trench or any other digging, the council wants six weeks' notice first, even where no planning permission is needed.
Which conversion suits which Canterbury house
A third of the district's homes are detached and nearly another third semi-detached, with terraces at about one in six. The district also has more bungalows than Kent as a whole. Each type below has a full guide.
Rooflights only. Often the first thing to look at inside a conservation area, because it leaves the roof shape alone. The steep pitches help. Keep them off the street side, and check first whether your house is one of those covered by an Article 4 direction.
Rear dormer. Outside the conservation areas, say on the interwar semis on the slopes north and south of the city or the London Road Estate's council-built houses, a rear dormer can usually go ahead without an application. Inside one, keep it small and below the ridge, with tiled cheeks.
Hip to gable. With semis and detached houses making up over 60% of the district, local firms build plenty. On New Dover Road and other streets of hipped Victorian villas, expect the planners to resist losing the hip.
Read our full guide: Hip-to-Gable Loft Conversions: What It Involves and Which Houses It Suits →
L-shaped dormer. Wincheap kept more of its old terraces than most of the city when post-war clearances took many elsewhere. Where one has a back addition, the second dormer over it is the natural spot for a shower room.
Mansard. Always a planning application, and on a listed house listed building consent as well. The council's 2007 heritage guidance counted 2,888 listed buildings in the district, so it comes up often. Bring in an architect early.
Extra bedroom. Most people want a bedroom. Building regulations then require a protected stair and linked smoke alarms, so make sure both are priced in from the first quote.
En-suite. Plan the soil pipe before the room layout. In the city centre, a new drain run outside can count as ground works and trigger the archaeology notice.
Home office. High-speed trains from Canterbury West reach St Pancras in under an hour, so plenty of people here work part of the week from home. Run a data cable up while the walls are open.
Read our full guide: Loft Home-Office Conversion: What Works Well Up There and What to Specify →
Planning. Find out first whether your house sits in a conservation area, carries an Article 4 direction or is listed. On the big new estates such as Mountfield Park or Howe Barracks, also read the original consent for conditions.
Cost. We won't print a Canterbury price. Peg tiles or a planning application can each move the figure a long way. Three quotes from people who've been up in your loft will tell you more.
Where these facts come from
- Conservation areas (Canterbury City Council)
- Heritage, Archaeology and Conservation guidance, 2007 (Canterbury City Council)
- New Dover Road design guidance (Canterbury City Council)
- Areas of archaeological importance (Canterbury City Council)
- Stodmarsh water quality (Canterbury City Council)
- Canterbury HMO Article 4 direction (Planning data)
- STG Building Control Partnership (Medway Council)
- Census 2021 housing and accommodation type (Kent County Council)
- Mathematical tiles (Canterbury Archaeological Trust)
- Permitted development for householders, technical guidance (GOV.UK)
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Questions people in Canterbury ask
I live in Wincheap. Does the student housing rule stop me converting my loft?
No. The Article 4 direction that came into force in February 2016 controls turning a family home into a shared house, across wards including Wincheap, Northgate and St Stephens. A loft room for your own family isn't a change of use. Letting the whole house to a group of sharers would be.
Can I turn the loft into a self-contained flat to let?
That's a new home, so it needs full planning permission. Around the city it also meets the Stodmarsh rule. Since Natural England's advice in July 2020, new housing draining to works such as Canterbury (Sturry) or Chartham has to show it won't add to nutrient pollution at the protected Stodmarsh lakes. Speak to the council before paying for drawings.
My house is near the Cathedral. Do I need to tell the archaeologists?
Only if the job involves digging. The city centre Area of Archaeological Importance covers ground works, and the council asks for six weeks' notice. Most lofts stay off the ground entirely. Check the drainage plan, though.
Who comes out to inspect the work?
Unless your builder uses a private inspector, it's the STG Building Control Partnership, which Canterbury shares with three other Kent councils. They inspect at stages and issue the completion certificate at the end.