Two-storey rear extension in Islington

Which Islington postcodes does this two storey rear service cover?

Every Islington postcode district we draw in, the stock that dominates it and the authority that validates a two storey rear there. Islington fees below are the statutory England rates for 2026, not two storey rear estimates.

Which Islington neighbourhoods suit a two storey rear best?

Roof pitch, wall build-up and plot depth change every few Islington streets, and each one changes what a two storey rear can achieve at that address.

• Canonbury (N1) — Georgian and Victorian conservation area defines Canonbury, where georgian villas, victorian terraces set what a two storey rear can do. Georgian rear elevations here are usually the listed or locally listed face of the building across N1. Any Canonbury two storey rear is validated by Islington Council, with Canonbury Square the usual Canonbury reference point on the site plan.
• Highbury (N5) — a two storey rear in Highbury starts from victorian terraces, mansion blocks, and Highbury reads as Victorian terraces around Highbury Fields. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage in N5. Islington Council assesses Highbury two storey rears against its own Highbury character guidance, and the location plan we draw for Highbury references Highbury Fields.
• Clerkenwell (EC1) — two storey rear work in Clerkenwell means warehouse conversions, georgian fragments. Clerkenwell is converted industrial buildings, creative offices. Georgian rear elevations here are usually the listed or locally listed face of the building throughout EC1. Islington Council decides the Clerkenwell application, and Exmouth Market anchors the Clerkenwell location plan.
• Finsbury Park (N4) — two storey rear work in Finsbury Park means victorian terraces, post-war estates. Finsbury Park is Victorian terraces, mixed. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage throughout N4. Islington Council decides the Finsbury Park application, and Finsbury Park anchors the Finsbury Park location plan.
• Archway (N19) — Victorian terraces on the hill defines Archway, where victorian terraces, post-war flats set what a two storey rear can do. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage across N19. Any Archway two storey rear is validated by Islington Council, with Whittington Hospital the usual Archway reference point on the site plan.
• Tufnell Park (N7, N19) — Victorian villas and terraces defines Tufnell Park, where victorian villas and terraces set what a two storey rear can do. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage across N7. Any Tufnell Park two storey rear is validated by Islington Council, with Tufnell Park station the usual Tufnell Park reference point on the site plan.
• Holloway (N7) — Victorian terraces, post-war estates defines Holloway, where victorian terraces, post-war estates set what a two storey rear can do. The side-return infill is the classic move on these Victorian terraces — 3 m of permitted development depth plus the width of the original side passage across N7. Any Holloway two storey rear is validated by Islington Council, with Holloway Road the usual Holloway reference point on the site plan.

Does Islington planning policy restrict a two storey rear?

Islington conservation designations: there are 40 across Islington Council, Angel, Barnsbury, Canonbury among them. Designation costs a Islington owner the permitted-development route: a two storey rear then needs a £548 householder application over 8 weeks, in place of the £249 prior approval route that takes 6 weeks. Highbury is the Islington designation that most often changes a two storey rear design.

What Article 4 removes near Islington: Article 4 Direction covering the whole borough removes permitted development rights for HMO conversions (C3 to C4). Separate Article 4 for office-to-residential in key areas. Before pricing a two storey rear we check whether the N1 address is inside the mapped area, because Islington Council draws the Islington boundary street by street rather than across the whole of Islington.

The building fabric around Islington: Georgian and early Victorian terraces, Victorian bye-law housing, 1930s mansion blocks, converted industrial buildings in Clerkenwell and Farringdon. Densely terraced, gentrified; strong conservation area coverage; active planning department. A two storey rear in Islington is scoped against that stock first.

What happens if a Islington property sits on a boundary?

• Camden — adjoining Islington, with 40 conservation areas centred on NW1. A two storey rear on the far side of the Islington line is determined by Camden Council, so the Islington quote for two storey rears is checked against Camden guidance before it is issued.
• Hackney — cross the Islington boundary and Hackney Council takes the two storey rear instead, applying 29 conservation areas of its own around E2. We re-price two storey rears at the Islington edge because Hackney policy and Islington policy rarely align on two storey rear depth.
• Haringey — adjoining Islington, with 29 conservation areas centred on N4. A two storey rear on the far side of the Islington line is determined by Haringey Council, so the Islington quote for two storey rears is checked against Haringey guidance before it is issued.
• City of London — cross the Islington boundary and City of London Corporation takes the two storey rear instead, applying 27 conservation areas of its own around EC1. We re-price two storey rears at the Islington edge because City of London policy and Islington policy rarely align on two storey rear depth.

Sources for this Islington two storey rear page: borough policies maps and conservation-area registers (2025–26), Royal Mail postcode district boundaries, the Town and Country Planning (Fees for Applications) (England) Regulations, the Town and Country Planning (General Permitted Development) (England) Order 2015 as amended, and the Party Wall etc. Act 1996.