Guide · 28 October 2026

Building costs and house prices in Hackney

Hackney is a borough of flats with a ribbon of very expensive houses running through it. Victorian and Georgian terraces line the streets of De Beauvoir, Clapton, Stoke Newington, Dalston and around Victoria Park, but they sit between large council estates, mansion blocks, converted warehouses in Shoreditch and Hackney Wick, and a lot of new building. If you are wondering whether to extend or move, the first question is which of those you own, because the answer changes almost everything below.

The numbers make the point. In the Census 2021 accommodation-type table (TS044, via Nomis), 60.4% of Hackney’s 106,079 households lived in a purpose-built block of flats, against 40.3% across London. Another 15.5% lived in a flat carved out of a converted or shared house (London: 11.1%), and a few per cent more in other converted buildings or above shops. Only 13.9% lived in a terraced house, 3.6% in a semi and 1.4% in a detached house. Put together, fewer than one Hackney household in five lives in a house, compared with 46% across the capital.

What homes cost in Hackney in August 2026

The latest UK House Price Index, published by HM Land Registry and the ONS on 21 October 2026, covers August 2026, and those figures are provisional. Hackney’s average price was £619,408. That is 1.6% lower than a year before, although it rose 1.3% on July. The London average was £554,430 (down 2.2% on the year), so a typical Hackney home costs about £65,000 more than the capital’s average, and the borough ranks 11th of London’s 33 local authority areas on price. The highest point in the series so far was £650,521 in September 2025, so prices are now about 4.8% below that. First-time buyers paid £561,870 on average and buyers who had owned before paid £763,584.

The pattern is the opposite of a typical outer borough. A Hackney terrace averages about £340,000 more than the London terrace average, and only five boroughs have a dearer average terrace. Flats, which most residents live in, are the only type that fell over the year, and they still average about £109,000 above the London flat figure. Treat the semi and detached figures with extra care: so few of these houses exist in Hackney that only a handful change hands, and the HPI models these figures rather than taking a simple average of sales. Land Registry recorded 101 Hackney sales of all types for June 2026, the latest month with a count. These are borough-wide figures from the HPI full data file and the ONS local house prices page for Hackney. They will be revised, and they can’t tell you what a particular home is worth.

Move to a bigger home, or build?

For most Hackney owners the real step up is from a flat to a house, and on August’s averages that meant finding about £453,000 more to go from the average flat to the average terrace. Going from a terrace to a semi meant about £240,000 more, and from a semi to a detached house about £140,000 more, though those last two rest on very few sales. Stamp duty, legal fees, surveys and removals come on top of every one of these gaps, and at these prices stamp duty alone runs to tens of thousands of pounds.

Nobody publishes building costs for Hackney alone, so the figures here are national. Checkatrade’s house extension cost guide (updated June 2026, with estimates checked by RICS and CIOB members) gives these UK ranges, excluding VAT:

• £1,800–£3,000 per m² for a finished single-storey extension
• £30,000–£42,000 for a small (15m²) rear extension to a mid-terrace house
• £108,000–£180,000 for a two-storey extension of 60m²
• £50,000–£95,000 for a 30m² loft conversion
• £100,000–£160,000 for a 40m² basement

Checkatrade says its figures aren’t based on location and that London and South East builders usually charge more, so expect Hackney quotes above these ranges, before VAT. Even allowing for that, a side-return infill or a loft on a Victorian terrace normally costs a fraction of the £240,000 terrace-to-semi gap, which is why so many Hackney terraces have been extended rather than sold. For flat owners it’s a different sum. Flats don’t have permitted development rights, most work beyond the walls of a flat needs planning permission, and in a leasehold flat you will usually need the freeholder’s consent as well. For many, moving is the only realistic way to get much more room. Building work may or may not add its cost to the sale price, so judge it on whether it gives you the space you need.

Permitted development: the national starting point

For houses, the Planning Portal’s extension guidance sets out what you can build without a planning application. A single-storey rear extension can go 3 metres beyond the original rear wall of a terrace or semi (4 metres for a detached house), or 6 and 8 metres under the prior approval scheme, where the council checks with neighbours first. A single-storey side extension can be up to 4 metres high and half the width of the original house. The loft conversion guidance allows up to 40 cubic metres of extra roof space on a terrace and 50 cubic metres on other houses, with nothing built out from the front roof slope.

In Hackney those national rights are narrower than usual, for two reasons. Conservation areas cover many of the borough’s terraced streets, and in a conservation area permitted development doesn’t allow side extensions, rear extensions of more than one storey or loft enlargements such as dormers, so all of these need planning permission. Some streets also have Article 4 directions (see below) that remove more rights. If your project does qualify, ask the council for a Lawful Development Certificate, which proves to a future buyer that the work was lawful. Building regulations approval is needed either way.

How Hackney judges extensions and lofts

Applications are decided against the London Plan and Hackney’s Local Plan 2033 (LP33), adopted on 22 July 2020, mainly its policies on design and local character (LP1), amenity (LP2) and heritage (LP3 and LP4). The council has started work on a replacement plan, which it expects to start using in 2029. In the former Olympic legacy area around Hackney Wick, where planning powers came back to the council on 1 December 2024, the London Legacy Development Corporation’s Local Plan still applies for now.

The detail is in the new Residential Extensions and Alterations SPD, adopted in December 2025 and in use since January 2026, which replaces the 2009 guide. If you need permission, these are the points most likely to shape your plans:

• Rear extensions. Single-storey rear extensions should go no deeper than 3 metres on a terrace, 3.5 metres on a semi and 4 metres on a detached house, measured from the original rear wall, and every extension should leave at least half of the original garden. Full-width extensions are normally acceptable, but the roof should sit visibly below the first-floor window sills.
• Side returns and wrap-arounds. Many Hackney terraces have an original back addition, or outrigger. Outside conservation areas a wrap-around extension can be acceptable. Inside them, the council will generally accept only an infill alongside the outrigger, not one that wraps around or goes beyond it, unless that is already the pattern on the terrace.
• Side extensions to semis and detached houses should stay at least 1 metre from the boundary and be no wider than half the original house, so the gap between houses isn’t closed up.
• Dormers. Rear dormers are normally acceptable if they sit at least 0.5 metres below the ridge and in from the roof edges and 1 metre above the eaves, and are no more than half the height and half the width of the roof. Side dormers are rarely accepted, and roof terraces on outriggers or cut into butterfly roofs are generally not.
• Mansards. On an unaltered roofline in a conservation area, a roof extension is generally not acceptable. Outside conservation areas, a carefully designed mansard can be, and on a Victorian house with a butterfly (London) roof the council sees a mansard as the most suitable form, keeping the rear roof profile.

In Stamford Hill, an area action plan is going through its final stages, and a design guide for the area is still in draft. The Inspector’s report arrived on 27 July 2026, ending the examination, but the plan isn’t adopted yet. If you live there, ask the council how it will affect roof extensions on your street.

Conservation areas and Article 4 directions

Hackney designated its first conservation areas in 1969, at Clapton Square, Clapton Common, Clapton Pond and Clissold Park. Its conservation areas map now lists 35, including Albion Square, Broadway Market, De Beauvoir, Graham Road and Mapledene, Northwold and Cazenove, St Mark’s, Stoke Newington, Victoria Park and South Shoreditch. Each has an appraisal describing what the council wants to keep, which is worth reading before you brief a designer.

Several have Article 4 directions that take away permitted development rights on houses. In De Beauvoir, a direction confirmed in November 2008 means changes to windows, front doors, railings, roofs and chimneys, front walls, porches and even painting the outside need permission on the properties it covers. The council’s Article 4 page lists newer directions in Brownswood and Well Street (in force since 9 May 2025) and Beck Road (since 28 May 2025), covering works around the house, minor works and some renewable energy installations, plus one covering named streets in Shacklewell Green since 22 October 2019. The same page lists directions on changes of use, including shops and offices to homes in industrial areas and town centres, but these don’t affect ordinary house extensions. Check your address before you order windows or plan a roof.

Basements and flood risk

The Planning Portal says a new basement is likely to need planning permission. Hackney’s SPD limits them to a single storey with at least 2.15 metres of headroom, reaching into the rear garden no more than half the depth of the house and no more than half the depth of the garden. Any part beyond the house’s footprint should have at least a metre of soil on top. Front lightwells are only accepted on streets where they are already a feature, and should take up no more than half the front garden. The east of the borough runs down to the River Lea and Hackney Marshes, so check your address on the government flood map for planning and ask your designer about groundwater and surface water before planning any work below ground.

Party walls in a borough of terraces

Almost every Hackney house shares at least one wall, so lofts, rear infills and basements here usually come under the Party Wall etc. Act 1996. Cutting steel beams into the party wall, building on the boundary line or digging foundations close to next door all mean serving notice on the neighbours, and in a converted house the neighbours may include the flats above and below. GOV.UK’s party wall guidance explains the notices and timings. If a neighbour disagrees, a surveyor (or one for each side) draws up an award setting out how the work will be done, and the person doing the work normally pays for it. Talking to neighbours before the notice arrives usually helps.

How to avoid a rogue builder

Doorstep offers, pressure to decide on the spot, a big upfront payment in cash and a quote that is just one round number are all warning signs. A sound builder will put an itemised quote and a contract in writing, take payments in stages as the work is done, show you their insurance and past jobs, and say who will sign off the building regulations.

Look for registered firms through TrustMark, go through Citizens Advice’s checklist before building work, and report rogue traders to your local Trading Standards office.

Figures change: get quotes before you decide

House prices here are UK HPI figures for August 2026, published 21 October 2026. They are provisional and will be revised, and the September 2026 figures are due on 18 November 2026. Building costs are Checkatrade’s national ranges, last updated June 2026. They are not Hackney prices, and London work usually costs more. Household figures come from Census 2021, taken on 21 March 2021. Planning details are from Hackney Council’s pages and its December 2025 SPD as they stood when we checked them on 28 October 2026. Check the rules for your own address, and get at least three itemised quotes based on proper drawings before you choose between building and moving.

Sources: UK House Price Index England: August 2026 (GOV.UK); UK HPI data downloads, August 2026 (full file, Hackney E09000012); ONS local house prices: Hackney; Census 2021 TS044 accommodation type (Nomis); Checkatrade: house extension costs; Planning Portal: extensions; Planning Portal: loft conversions; Planning Portal: basements; Hackney Council: find out if you need planning permission; Hackney Council: Local Plan 2033 (LP33); Hackney Council: Residential Extensions and Alterations SPD (December 2025); Hackney Council: Stamford Hill Area Action Plan examination; Hackney Council: conservation areas map; Hackney Council: De Beauvoir conservation area; Hackney Council: Article 4 directions; GOV.UK flood map for planning; GOV.UK: Party Wall etc. Act guidance; TrustMark; Citizens Advice: before building work; GOV.UK: find local Trading Standards. Data checked 28 October 2026.