Which postcode districts around Hackney do we cover for mansard roof extension work?
The Hackney postcode districts we draw in, what their stock is made of, and who determines an application. Fees below are 2026 England statutory rates. Flood mapping matters here in one place and not the rest: 14.5% of E9's 684 postcode units fall inside Flood Zone 3, and 3.3% of E5's, because the mapped extent follows the Lea and the marshes. E8, N16 and N4 have no units in Zone 2 or Zone 3 at all, so a Flood Risk Assessment is not in play there.
| Postcode | Area | Dominant stock | What it means for a mansard roof extension |
|---|
| N16 | Stoke Newington / Stamford Hill | Georgian and Victorian terraces | N16 is Stoke Newington and Stamford Hill, mostly Hackney, though the Newington Green corner falls to Islington. Establish the authority from the address itself, not from the district. |
| E5 | Clapton | Victorian terraces, mansion blocks | Clapton fills E5 and lies entirely within Hackney. Its eastern edge drops towards the Lea, which puts 22 of E5's 663 postcode units inside Flood Zone 3. |
| E8 | Hackney Central / Dalston / London Fields | Victorian terraces, post-war flats | E8 is Hackney Central, Dalston and London Fields, wholly within the borough. Conservation boundaries there are drawn around streets rather than around the postcode. |
| E9 | Homerton / Hackney Wick | Victorian terraces, post-war estates | Homerton and Hackney Wick make up E9, all of it Hackney, and the Lea runs along its flank. 99 of the district's 684 postcode units lie within Flood Zone 3, so on the Wick side a Flood Risk Assessment is a real prospect. |
| EC2A | Shoreditch | Warehouse conversions, modern infill | EC2A takes in the Shoreditch fringe, where Hackney meets the City of London Corporation. That boundary runs through the block, so it is worth checking rather than assuming. |
| N1 | Islington / Hoxton | Georgian and early Victorian terraces | N1 crosses the Hackney-Islington line through Hoxton and De Beauvoir, and the applicable policies map is settled street by street. |
| N4 | Finsbury Park / Stroud Green | Victorian terraces, post-war estates | N4 covers Finsbury Park and Stroud Green and is shared between Haringey, Islington and Hackney. Only the address itself settles which of the three determines. |
| E2 | Bethnal Green | Warehouse conversions, modern infill | E2 is Bethnal Green, divided between Tower Hamlets and Hackney. Both policies maps are read against the address before anything is drawn. |
How does a mansard roof extension differ street by street across Hackney?
Hackney's terraces are not uniform. Storey height, party wall construction and roof geometry all differ street by street, and each difference either limits a mansard or lets it grow.
- Stoke Newington (N16) — mansard roof extension work in Stoke Newington means victorian terraces, georgian fragments. Stoke Newington is Victorian terraces, village character. Mansards read as original on Georgian terraces throughout N16. Hackney Council decides the Stoke Newington application, and Clissold Park anchors the Stoke Newington location plan.
- Shoreditch (E1, E2, EC2A) — mansard roof extension work in Shoreditch means warehouse conversions, modern infill. Shoreditch is Victorian warehouse conversions, creative industries. Mansards on modern buildings are unusual and generally read as an alien addition throughout E1. Hackney Council decides the Shoreditch application, and Boxpark anchors the Shoreditch location plan.
- Hackney Central (E8) — mansard roof extension work in Hackney Central means victorian terraces, post-war estates, new-build. Hackney Central is regenerated centre, Victorian terraces around. A mansard on a Victorian terrace almost always needs full planning permission throughout E8. Hackney Council decides the Hackney Central application, and Hackney Empire anchors the Hackney Central location plan.
- London Fields (E8) — a mansard roof extension in London Fields starts from victorian terraces, and London Fields reads as Victorian terraces around the park. A mansard on a Victorian terrace almost always needs full planning permission in E8. Hackney Council assesses London Fields mansard roof extensions against its own London Fields character guidance, and the location plan we draw for London Fields references London Fields park.
- Clapton (E5) — a mansard roof extension in Clapton starts from victorian terraces, mansion blocks, and Clapton reads as Victorian terraces, Lea valley fringe. A mansard on a Victorian terrace almost always needs full planning permission in E5. Hackney Council assesses Clapton mansard roof extensions against its own Clapton character guidance, and the location plan we draw for Clapton references Lea Bridge.
- Homerton (E9) — Victorian terraces, post-war estates defines Homerton, where victorian terraces, post-war estates set what a mansard roof extension can do. A mansard on a Victorian terrace almost always needs full planning permission across E9. Any Homerton mansard roof extension is validated by Hackney Council, with Homerton Hospital the usual Homerton reference point on the site plan.
- Hackney Wick (E9) — a mansard roof extension in Hackney Wick starts from warehouse conversions, new-build, and Hackney Wick reads as industrial conversions, Olympic fringe. Mansards on modern buildings are unusual and generally read as an alien addition in E9. Hackney Council assesses Hackney Wick mansard roof extensions against its own Hackney Wick character guidance, and the location plan we draw for Hackney Wick references Hackney Wick Overground.
Does Hackney planning policy restrict a mansard roof extension?
Conservation areas covering Hackney: 29 on the council's list, and Stoke Newington, Dalston Lane and Hackney Central account for most of the ones we meet. Within a designation a mansard has no permitted development route open to it, so the work becomes a householder application. The householder application fee in England is £548, determined in eight weeks. The fee for a larger householder prior approval is £249 on a six-week clock, but that prior approval route is simply unavailable to you inside the boundary. De Beauvoir Town shows how it works in practice, with the frontage assessed ahead of everything else in the file.
Hackney and Article 4: Article 4 Direction covers HMO conversions borough-wide and office-to-residential in specific commercial zones. A mansard roof extension planned at a N16 address is checked against that direction first; Hackney Council publishes the Hackney extent, and the N16 line rarely follows the Hackney boundary you would expect.
The building fabric around Hackney: Victorian terraces dominate; large post-war estates around Hackney Wick; Georgian fragments in De Beauvoir and Stoke Newington; new-build around the Olympic Park. Young demographic; high design-quality bar in planning; mansards routinely approved in rear-of-terrace positions within conservation areas following the Hackney design guide. A mansard roof extension in Hackney 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 Hackney Council.
Which neighbouring authorities border Hackney?
- Haringey — the Haringey boundary runs against Hackney, so a mansard roof extension a street from Hackney is decided by Haringey Council instead. Haringey runs 29 conservation areas across N4 and its neighbours, which is why mansard roof extensions priced for Hackney are re-checked against Haringey policy whenever the Hackney address sits on that edge.
- Waltham Forest — the Waltham Forest boundary runs against Hackney, so a mansard roof extension a street from Hackney is decided by Waltham Forest Council instead. Waltham Forest runs 17 conservation areas across E4 and its neighbours, which is why mansard roof extensions priced for Hackney are re-checked against Waltham Forest policy whenever the Hackney address sits on that edge.
- Newham — adjoining Hackney, with 10 conservation areas centred on E6. A mansard roof extension on the far side of the Hackney line is determined by Newham Council, so the Hackney quote for mansard roof extensions is checked against Newham guidance before it is issued.
- Tower Hamlets — adjoining Hackney, with 58 conservation areas centred on E1. A mansard roof extension on the far side of the Hackney line is determined by Tower Hamlets Council, so the Hackney quote for mansard roof extensions is checked against Tower Hamlets guidance before it is issued.
Sources for this Hackney mansard roof 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.
