House Extension Drawings in Islington

Which Islington postcodes does this house extension service cover?

Each postcode district we work in here, the housing that fills it, and who validates an extension at a given address. Fees shown are 2026 statutory England rates, separate from anything we charge.

What changes about a house extension in each part of Islington?

Roof pitch, the construction of the walls and the depth of the plot all vary within a few streets of Islington, and each of them bears on what an extension can achieve.

• Newington Green (N16) — a house extension in Newington Green starts from georgian and victorian terraces, and Newington Green reads as Georgian fragments, Victorian terraces. Georgian rear elevations here are usually the listed or locally listed face of the building in N16. Islington Council assesses Newington Green house extensions against its own Newington Green character guidance, and the location plan we draw for Newington Green references Newington Green.
• Angel (N1, EC1V) — a house extension in Angel starts from georgian and early victorian terraces, and Angel reads as Georgian terraces, dense town centre. Georgian rear elevations here are usually the listed or locally listed face of the building in N1. Islington Council assesses Angel house extensions against its own Angel character guidance, and the location plan we draw for Angel references Angel station.
• Barnsbury (N1) — house extension work in Barnsbury means georgian and early victorian terraces. Barnsbury is Georgian conservation area. Georgian rear elevations here are usually the listed or locally listed face of the building throughout N1. Islington Council decides the Barnsbury application, and Barnsbury Square anchors the Barnsbury location plan.
• Canonbury (N1) — a house extension in Canonbury starts from georgian villas, victorian terraces, and Canonbury reads as Georgian and Victorian conservation area. Georgian rear elevations here are usually the listed or locally listed face of the building in N1. Islington Council assesses Canonbury house extensions against its own Canonbury character guidance, and the location plan we draw for Canonbury references Canonbury Square.
• Highbury (N5) — Victorian terraces around Highbury Fields defines Highbury, where victorian terraces, mansion blocks set what a house extension 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 N5. Any Highbury house extension is validated by Islington Council, with Highbury Fields the usual Highbury reference point on the site plan.
• Clerkenwell (EC1) — converted industrial buildings, creative offices defines Clerkenwell, where warehouse conversions, georgian fragments set what a house extension can do. Georgian rear elevations here are usually the listed or locally listed face of the building across EC1. Any Clerkenwell house extension is validated by Islington Council, with Exmouth Market the usual Clerkenwell reference point on the site plan.
• Finsbury Park (N4) — a house extension in Finsbury Park starts from victorian terraces, post-war estates, and Finsbury Park reads as 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 in N4. Islington Council assesses Finsbury Park house extensions against its own Finsbury Park character guidance, and the location plan we draw for Finsbury Park references Finsbury Park.

What local planning policy applies to a house extension in Islington?

Designation, and what it costs you in process: 40 conservation areas cover the borough, with Clerkenwell, Angel and Barnsbury the ones owners meet most. Inside one, permitted development falls away, so a £548 householder application over eight weeks replaces the £249 prior approval over six. Around Clerkenwell, how the work reads from the street is the first thing assessed.

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 house extension 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 house extension in Islington is scoped against that stock first, because it decides whether the scheme runs as permitted development, a £274 Lawful Development Certificate, or a full £548 application to Islington Council.

Who decides a house extension on the edge of Islington?

• Camden — the Camden boundary runs against Islington, so a house extension a street from Islington is decided by Camden Council instead. Camden runs 40 conservation areas across NW1 and its neighbours, which is why house extensions priced for Islington are re-checked against Camden policy whenever the Islington address sits on that edge.
• Hackney — the Hackney boundary runs against Islington, so a house extension a street from Islington is decided by Hackney Council instead. Hackney runs 29 conservation areas across E2 and its neighbours, which is why house extensions priced for Islington are re-checked against Hackney policy whenever the Islington address sits on that edge.
• Haringey — the Haringey boundary runs against Islington, so a house extension a street from Islington is decided by Haringey Council instead. Haringey runs 29 conservation areas across N4 and its neighbours, which is why house extensions priced for Islington are re-checked against Haringey policy whenever the Islington address sits on that edge.
• City of London — the City of London boundary runs against Islington, so a house extension a street from Islington is decided by City of London Corporation instead. City of London runs 27 conservation areas across EC1 and its neighbours, which is why house extensions priced for Islington are re-checked against City of London policy whenever the Islington address sits on that edge.

Sources for this Islington house extension 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.