01Areas we cover
Canonbury: drawings for Georgian squares and terraces
Canonbury's design guidelines refuse dormers on front slopes, infilled front basement areas and altered railings. We draw planning, listed building and Building Regulations sets that begin from those limits and show what is still available, after a free constraints check.
Fixed quote after a free constraints check
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02The record
Canonbury on the record
| Measure | Value | Period | Source |
|---|---|---|---|
| Local fact | Canonbury Conservation Area was designated on 18 February 1969 and last amended on 23 January 2001; East Canonbury was designated on 26 June 1989 and last extended on 25 February 2003. | No period | islington.gov.uk |
| Local planning consideration | The Canonbury guidelines say the council will not permit new or enlarged dormers or rooflights on the front or side slopes of exposed pitched roofs, nor roof extensions on parapet roofs that are visible from the street or other public areas. | No period | islington.gov.uk |
| Local planning consideration | In Canonbury, full-width rear extensions higher than one storey, or half-width rear extensions higher than two storeys, will not normally be permitted unless shown to cause no harm. | No period | islington.gov.uk |
| Local planning consideration | The council will not normally permit front basement areas to be filled in or covered over in the Canonbury Conservation Area. | No period | islington.gov.uk |
| Local fact | Islington Article 4 directions: material changes to windows facing a public highway | No period | islington.gov.uk |
| Local fact | Canonbury Article 4 direction (2002) | No period | islington.gov.uk |
| Conservation areas | 41 named conservation areas published by the council | No period | planning.data.gov.uk |
| Listed building entries | 1,050 list entries (Historic England, within the LPA boundary) | No period | planning.data.gov.uk |
| Listed building consents granted (PS2) | 91.2 % granted | 2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026) | assets.publishing.service.gov.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
- Islington
03The drawing
Constraints check: Islington
What we check first on any address in Islington. Counts are for the whole council area.
- A Conservation areas
- 41 named conservation areas published by the council
- B Listed building entries
- 1,050 list entries (Historic England, within the LPA boundary)
- C Heritage at Risk entries
- 33 Heritage at Risk Register entries within the LPA boundary (Historic England)
04The brief
Two conservation areas, one set of habits
Canonbury Conservation Area was designated on 18 February 1969 and last amended on 23 January 2001; East Canonbury was designated on 26 June 1989 and last extended on 25 February 2003. The council describes Canonbury Square as one of the earliest and finest squares in Islington, and the New River Walk as an important feature of the area.
Both areas carry design guidelines, and they repeat the same themes. Roofs, front basement areas and boundary railings recur in both, which makes the front elevation the most closely read sheet.
05The detail
Roofs: what the guidelines refuse
The Canonbury guidelines say the council will not permit new or enlarged dormers or rooflights on the front or side slopes of exposed pitched roofs, nor roof extensions on parapet roofs that are visible from the street or other public areas.
Traditional mansards, where permitted, must be mansarded at the rear too, not vertical brickwork, keeping the butterfly or original back profile. A mansard here is drawn as a full roof form, rear included, and our mansard roof drawings page shows how we draw it.
Front basement areas, railings and rear extensions
The council will not normally permit front basement areas to be filled in or covered over in the Canonbury Conservation Area. Alteration or removal of original front walls, railings and footings will not be permitted; new railings black, to an agreed pattern.
In Canonbury, full-width rear extensions higher than one storey, or half-width rear extensions higher than two storeys, will not normally be permitted unless shown to cause no harm. Our basement conversion drawings page covers work below the house.
Windows, Article 4 directions and listed terraces
Windows are the control that surprises Canonbury owners most. Islington's entry reads "Islington Article 4 directions: material changes to windows facing a public highway", and the Canonbury Article 4 direction (2002) sits beside it, so a sash swapped for double glazing can need an application even when the roof and basement are left alone.
Where a Canonbury house is listed, consent comes before any of this. Islington holds 1,050 entries across 41 conservation areas. Of 262 consent decisions in its latest year, 91.2% were granted. Those figures describe the whole borough. Start a listed terrace house with listed building consent drawings; for another hillside of period streets, read Highgate.
06The papers
What the drawings rest on
Planning drawings
07Correspondence
Questions
Can I add a dormer to a Canonbury house?
The guidelines rule out most of it. No new or enlarged front or side dormers or rooflights on pitched roofs; no roof extensions on parapet roofs visible from public areas. We check your roof type and visibility from the street before proposing a design.
Can I fill in my front basement area in Canonbury?
Usually not. Front basement areas will not normally be filled in or covered over; widening steps and bin or meter enclosures also resisted. Any change to the area needs a clear case drawn from the existing frontage.
My Canonbury terrace is listed. What changes?
Railings, front steps, the area wall and original sashes become matters of listed fabric, so each is drawn as found before anything is proposed. Where neighbouring houses are listed together, we also look at how a change reads along the terrace, not just at your own frontage.
What does a mansard cost in Canonbury, given the strict roof rules?
The price does not change with the refusal: it starts at £845 including VAT. What changes is the drawing. Where a mansard is permitted at all, the guidelines expect the rear to be mansarded as well, so the set shows the full roof form. The council's own fee is separate.
91.2%
granted
Listed building consents granted (PS2), Islington, 2025 Q2 to 2026 Q1 (1 Apr 2025 to 31 Mar 2026). Source: assets.publishing.service.gov.uk
08Further reading
Drawings in Canonbury
09Sources
Sources and dates
- islington.gov.uk, retrieved
- islington.gov.uk, retrieved
- islington.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- islington.gov.uk, retrieved
- planning.data.gov.uk, retrieved
Licences
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.
- © OpenStreetMap contributors, available under the Open Database Licence (ODbL).
Send us the address of your house.
We look up the conservation area, listing and Article 4 position, then reply with a fixed fee. A message before 3pm is answered the same working day.