Islington, London
Loft conversion drawings in Islington
In Islington a loft is most likely to be accepted at the back of the roof, out of sight from the street, and we draw that scheme from £695 including VAT. With 41 conservation areas and a borough where only 16.3 per cent of households live in a house, the first question is whether your roof can be extended as of right at all.
From £695 (VAT included)
- MCIAT chartered
- £2m PI insured
- LABC Partnered
- Fixed fees, VAT included
Request a fixed quote
How we work on loft conversion drawings
Nine steps from first call to approval.
Enquiry and constraints check
We check the property against conservation areas, listed status, Article 4 directions, tree preservation orders, flood zone and planning history. We choose the right route and send a fixed quote.
Measured survey
We survey the house on one datum: rooms, levels, boundaries, drains, trees and the neighbours' windows that the 45° and 25° tests depend on.
Design options
We model the house in Revit and show you options in 3D and plan, with the planning strategy and the precedents in your street.
Design frozen
You choose an option in writing. Nothing changes after this without your say.
Independent check
A second chartered technologist checks every sheet against the council's validation checklist and the policy. A senior review signs it off before anything is submitted.
Submission
We prepare the forms, certificates, fee and documents and submit through the Planning Portal.
Officer liaison
We answer the planning officer and make any amendments within five working days, at no charge until approval.
Building regulations
Technical drawings are coordinated with the structural engineer's calculations, the drainage and the planning conditions.
Approval and hand-over
Building control approval, then a next-steps pack covering the commencement notice, party wall timing and CIL.
Free redraws until approval. Every drawing set is checked independently, and the checker is never the person who drew it.
Request a fixed quote
What Islington's Urban Design Guide says about roofs
The council's Islington Urban Design Guide SPD is blunt about roofs on historic streets. In conservation areas, it says roof extensions on an unaltered roofline will not generally be acceptable, though a rear extension that cannot be seen from the public realm may be. On semi-detached villas the guide also says that a one-sided extension is normally resisted where it upsets the symmetry of the pair.
Those two sentences shape most of our Islington lofts. We draw sight lines from the opposite pavement and from the rear gardens behind, and we test whether the proposed box would show above the parapet or beyond a neighbouring chimney. When it does, we adjust the width or the height before the application goes in, because a refusal on appearance is hard to reverse.
Outside conservation land the national volume limit applies: 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume. For a terraced house the lower figure is the one that applies.
Local figures for Islington
| Measure | Value | Period | Source |
|---|---|---|---|
| Conservation areas | 41 named conservation areas published by the council | — | planning.data.gov.uk |
| Listed building entries | 1,050 list entries (Historic England, within the LPA boundary) | — | planning.data.gov.uk |
| Grade II listed entries | 1,002 list entries | — | planning.data.gov.uk |
| Households living in a house | 16.3 % of households living in a house or bungalow (detached, semi-detached or terraced) | Census 2021 | nomisweb.co.uk |
| Owner-occupied households | 26.7 % of households owner-occupied (owned outright or with mortgage/loan) | Census 2021 | nomisweb.co.uk |
| Householder decisions | 337 decisions | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications granted | 92.6 % | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| Householder applications decided in time | 98.8 % decided within 8 weeks or an agreed extended period | 1 July 2025 - 30 June 2026 | assets.publishing.service.gov.uk |
| GPDO 2015 Sch 2 Pt 1 Class B, para B.1(d) | 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume | — | legislation.gov.uk |
| Class B, para B.1(f) | Class B roof enlargements are not permitted development on article 2(3) land | — | legislation.gov.uk |
| Approved Document K 2013, para 1.13, Diagram 1.4 | Loft conversions where 2.0 m cannot be achieved: 1.9 m at the centre of the stair, 1.8 m at the side (half width) | — | gov.uk |
| Approved Document B Vol 1, para 2.21 | New storey above 4.5 m by loft conversion: protect the full escape route with fire-resisting doors (min E 20) and partitions (min REI 30) | — | gov.uk |
A blank value means the figure has not been published, not that there are none. Check your own address with the council.
Householder applications by street in Islington
| Street | Applications | Approved |
|---|---|---|
| Corbyn Street | 35 | 85% |
| Plimsoll Road | 28 | 93% |
| Aberdeen Park | 24 | 91% |
| Thorpedale Road | 21 | 90% |
| Highbury Hill | 20 | 94% |
| Hungerford Road | 20 | 88% |
| Sussex Way | 18 | 100% |
| Avenell Road | 15 | 85% |
| Hemingford Road | 15 | 79% |
| Huddleston Road | 15 | 100% |
| Romilly Road | 15 | 92% |
| Harberton Road | 14 | 100% |
| Offord Road | 14 | 86% |
| St George's Avenue | 14 | 100% |
| Thornhill Road | 14 | 79% |
Loft enlargement in section: the permitted development limits
A dormer on the rear slope, with the limits that decide whether it needs planning permission.
- A · Extra roof volume allowed
- 40 m³ (terrace house) / 50 m³ (any other house) additional roof volume
- B · Set-back from the eaves
- Original eaves maintained; enlargement set at least 0.2 m from the eaves measured up the roof slope, so far as practicable (not required for hip-to-gable or roofs joining a rear/side extension)
- C · Height limit
- No part higher than the highest part of the existing roof
Butterfly roofs, parapets and flat-fronted terraces
Some older terraces hide their roof behind a parapet, and some have a butterfly roof, two slopes falling to a central valley. A butterfly roof gives little usable height, so the usual answer is to rebuild the rear half as a flat-topped extension. That is a real alteration to the roof, and the Urban Design Guide test of visibility decides how it must look.
We measure the valley, the parapet height and the party walls on one datum, then show the rebuilt roof against the existing profile in the section. A neighbour reading your application can see at once that the front parapet stays untouched.
Conservation areas, listed streets and what they remove
Islington has 41 conservation areas and 1,050 listed entries, of which 1,002 are Grade II. In a conservation area the rule is: Class B roof enlargements are not permitted development on article 2(3) land. A listed house needs listed building consent for almost any roof change, which is handled outside this service and with a heritage statement.
We search the planning history of your street before drawing. A neighbour's approved dormer is evidence, though the council treats each roofline on its own merits, and a refused scheme next door tells us what to avoid.
Flats, freeholders and the borough's housing mix
Only 26.7 per cent of Islington households own their home, and the census shows 16.3 per cent living in a house or bungalow. In many cases the roof space belongs to a freeholder, or is shared among several flat owners in a converted terrace.
Flats have no permitted development for roof enlargements, so the route is a householder or full application plus the lease consent. We advise on the drawings; your solicitor handles the lease. If the whole building is owned by one party, a joint scheme sometimes serves the top-floor flat and the building together.
Stairs, headroom and the escape route
Terraces here are narrow, so the staircase is usually the hardest part of the design. The regulations allow a reduced head height on loft stairs: Loft conversions where 2.0 m cannot be achieved: 1.9 m at the centre of the stair, 1.8 m at the side (half width). We test the stair on the landing below, and we flag when it removes more from the floor beneath than the loft is worth.
A storey this high also needs a protected route out: New storey above 4.5 m by loft conversion: protect the full escape route with fire-resisting doors (min E 20) and partitions (min REI 30). Our building regulations drawings in Islington show the doors and the new roof build-up in one set.
How Islington decides householder applications
The council decided 337 householder applications in its latest published year, granted 92.6 per cent and decided 98.8 per cent within the statutory period or an agreed extension. The grant rate is high, and it covers every householder project, from a rooflight to a rear addition.
If you qualify for permitted development, a Lawful Development Certificate in Islington records it. If you do not, the planning drawings in Islington carry the application.
Fee, deliverables and related pages
Loft conversion drawings start at £695 including VAT, fixed before we begin. You receive plans, sections, elevations and the location and block plans, checked by a second chartered technologist.
For the whole borough see architectural drawings in Islington. To raise the rear at the same time, look at rear extension drawings in Islington. Neighbours to compare: Camden and Hackney.
What you receive
Related pages
Other services in Islington
Questions
Will Islington allow a loft extension in a conservation area?
It can, if the extension is at the rear and cannot be seen from the public realm. The council's Urban Design Guide says extensions on an unaltered roofline will not generally be acceptable. The borough has 41 conservation areas.
Why does a semi-detached villa loft get extra scrutiny?
The council normally resists a one-sided roof extension where it undermines the symmetry of the pair, so we often draw a scheme that respects the neighbour's roofline.
How much does a loft drawing set cost in Islington?
From £695 including VAT, fixed in advance. Application fees to the council are separate.
Do I need the freeholder's consent for a flat loft?
Usually yes. Only 26.7 per cent of Islington households are owner-occupied, and in a converted building the roof is normally the freeholder's. Planning permission is needed as well.
Sources and dates
- planning.data.gov.uk, retrieved
- planning.data.gov.uk, retrieved
- nomisweb.co.uk, retrieved
- nomisweb.co.uk, retrieved
- assets.publishing.service.gov.uk, retrieved
- legislation.gov.uk, retrieved
- gov.uk, retrieved
- gov.uk, retrieved
- islington.gov.uk, retrieved
- Contains public sector information licensed under the Open Government Licence v3.0.
- Contains OS data © Crown copyright and database right 2026.
- Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.
- Contains Historic England data © Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026.
Tell us about your property.
We check the constraints, then send a fixed fee. Messages before 3pm get a reply the same working day.