Guide · 1 November 2026

Building costs and house prices in Havering

Havering is London’s far eastern corner: Romford’s town centre, the semis and bungalows of Hornchurch, Upminster, Collier Row and Harold Wood, the Gidea Park garden suburb, newer homes around Rainham and Beam Park, and a great deal of farmland and country park. It is a borough of family houses, and more of its people own their home than in most of London, so the choice between moving up the ladder and adding space to the house you already have is a very common one here.

The Census 2021 accommodation-type table (TS044, via Nomis) counted 101,277 households in Havering. 41.2% lived in a semi-detached house, more than twice London’s 18.6%. Terraced houses held 24.3% and detached houses 11.1%, so about three in four households (76.6%) live in a whole house, against 46.0% across London. Only 19.8% lived in purpose-built flats and 1.7% in flats in a converted or shared house. The Census tenure table (TS054) found 69.5% of households owned their home, 34.5% outright and 35.0% with a mortgage or loan, against 45.2% in London as a whole.

What homes cost in Havering in August 2026

The UK House Price Index from HM Land Registry and the ONS, published on 21 October 2026, gives Havering an average price of £444,572 for August 2026. The figures are provisional. That is 1.1% higher than a year earlier, although prices slipped 0.6% from July. London’s average was £554,430, down 2.2% on the year, so a typical Havering home costs about £110,000 less than the London figure. Havering is 29th of the 33 London areas on price, the fifth-cheapest, but its annual change was the sixth-strongest in the capital. The borough’s highest monthly figure so far was £449,340 in June 2026, about 1% above August. First-time buyers paid £385,091 on average, and people who had owned before paid £536,473.

Houses of every kind edged up over the year while flats fell. Each type is well below London’s average for that type, and Havering’s flats are among the cheapest in the capital. Land Registry recorded 171 sales of all types in the borough in June 2026, the latest month with a count. The figures come from the HPI full file and the ONS local house prices page for Havering. The HPI models type averages rather than simply averaging the homes that sold, and the figures will be revised, so they describe the borough as a whole and can’t value a particular house.

Move to a bigger home, or build?

On August’s averages, going from a flat to a terraced house meant finding about £182,600 more. The step from a terrace to a semi was about £103,800, and from a semi to a detached house about £295,700. Stamp duty, legal fees, surveys and removals come on top of each of those.

No one publishes building costs for Havering alone, so the figures below 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 15m² rear extension to a mid-terrace house
• £108,000–£180,000 for a 60m² two-storey extension
• £50,000–£95,000 for a 30m² loft conversion
• £100,000–£160,000 for a 40m² basement
• £8,500–£20,000 for a 15m² garage conversion
• £350–£950 for architectural drawings

Checkatrade says its figures don’t reflect location and that London and the South East usually cost more, so expect local quotes above these ranges, and add VAT. In Havering the sums are tighter than in most of London, because house prices are lower while building costs are not much cheaper. The terrace-to-semi gap of about £103,800 is smaller than the price of a large two-storey extension, so for someone in a terrace who needs a lot more room, moving can be the cheaper way to get it. A loft or a modest single-storey rear extension still comes in well under that gap, and many semis here have a garage or side space that can be converted for less again. The semi-to-detached step is far larger, so building usually wins there. Flat owners have fewer options, because flats have no permitted development rights and leaseholders usually need the freeholder’s written consent too. Whichever way you lean, don’t assume the building cost comes back when you sell, especially where local prices are modest; judge the work on whether it gives you the space you need.

Permitted development: the national rules

For houses, the Planning Portal’s extension guidance sets out what can be built without an application. A single-storey rear extension can go out 3 metres from the original back wall of a terrace or semi, or 4 metres for a detached house. Under the prior approval scheme those limits rise to 6 and 8 metres, up to 4 metres high, once the council has notified the neighbours and agreed. 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 roof slope facing the road.

These rights are narrower in conservation areas, where side extensions, rear extensions of more than one storey and dormers need planning permission, and on land covered by Article 4 directions (see below). If your plans do fit, a Lawful Development Certificate from the council gives you proof to show a future buyer. Building regulations approval is needed either way.

How Havering judges extensions

Applications are decided against the London Plan and the Havering Local Plan 2016–2031, adopted in November 2021. Its policies on residential design and amenity (Policy 7) and urban design (Policy 26) apply to extensions, and the council’s planning policy pages show a review of the plan at the evidence-gathering stage. The detailed house rules are in the Residential Extensions and Alterations SPD from 2011, one of the supplementary planning documents the council still uses. It is older than the Local Plan, so read it alongside the plan. Its main points are:

• Single-storey rear extensions. As a general rule, up to 3 metres deep on a terrace and 4 metres on a semi or detached house. Anything deeper should stay within a 45-degree line drawn from the 3 or 4 metre point on the boundary, to protect the neighbours.
• Two-storey rear extensions. Set in at least 2 metres from the boundary with any attached house and no more than 3 metres deep, or up to 4 metres in exceptional cases where similar extensions already exist nearby. A pitched roof with a hipped end is preferred.
• Side extensions. A two-storey side extension to a semi should step back at least 1 metre from the front wall at first floor, so the pair stays balanced and doesn’t start to look like a terrace. Detached houses shouldn’t be extended right up to both side boundaries, and a side extension mustn’t break a 45-degree line from a neighbour’s side window.
• Lofts. Turning a hipped roof into a gable on one of a pair of semis won’t be accepted where the council controls it and hipped roofs are part of the street’s character, though much of this work can be done under permitted development. Dormers should face the back garden, sit well within the roof and stay well below the ridge; a front dormer, if allowed at all, should be no wider than 1.2 metres, and dormers in a hipped end are not normally acceptable.
• Front gardens. Where planning permission is needed for parking in a front garden, the SPD looks for a depth of at least 4.8 metres and about 40% kept as planting.

The Local Plan also matters if you’re thinking of building a new home in a large garden. Policy 10 sets tests for garden and backland development and does not support splitting plots in the Hall Lane and Emerson Park character areas unless the proposal clearly fits the area. More than half of the borough is Metropolitan Green Belt, where extending a house is much more tightly limited.

Conservation areas and Article 4

The council’s heritage pages list 11 conservation areas: Corbets Tey, Cranham, Gidea Park, Havering-atte-Bower, Langtons, North Ockendon, RAF Hornchurch, Rainham, Romford, St Andrews and St Leonards. The biggest for homeowners is Gidea Park, the early 20th-century garden suburb designated in 1970.

The council’s Article 4 pages describe several directions. In the Gidea Park Conservation Area, a direction made at the end of 2015 removes certain permitted development rights from houses, so changes that would be automatic elsewhere need an application. It was confirmed in June 2016, and the conservation area’s appraisal and management plan explains what the area values. Two directions on houses in multiple occupation, in force since July 2016, mean that turning a home into a small shared house needs planning permission: for any home in Brooklands, Romford Town, Heaton and Gooshays wards, and for flats, terraced houses and semis in the rest of the borough. Other directions cover individual sites, so check your address before you commission drawings.

Basements and flooding

The Planning Portal says a new basement is likely to need planning permission. The Havering Local Plan has no policy just for basements, so a scheme is judged on the general design and amenity policies and on flood risk, which matters here. The plan notes that Havering has a large share of London’s floodplains, and Policy 32 asks for a site-specific flood risk assessment where the council knows of drainage problems and in the Washlands Flood Storage Area, along with sustainable drainage where practical. Check your address on the government flood map for planning before you spend money on a design, especially for anything below ground.

Party walls

With so many semis and terraces, a large share of lofts and rear extensions in Havering touch the Party Wall etc. Act 1996. Cutting steel beams into the shared wall, building on or astride the boundary, raising a party wall for a loft or digging close to a neighbour’s foundations all mean serving notice before work starts. GOV.UK’s party wall guidance explains the notices and the time limits. If a neighbour doesn’t agree, one agreed surveyor, or one for each side, makes an award setting out how the work will be done, and the person building normally pays. Talking to the neighbours before any paperwork arrives usually saves time and money.

How to avoid a rogue builder

Be wary of anyone who turns up uninvited, presses you to agree on the spot, wants a large cash payment before starting or gives a single round figure with no breakdown. A sound firm gives you an itemised quote and a written contract, takes staged payments as the work progresses, shows its insurance and past jobs, and is clear about who handles building regulations sign-off.

Look for registered firms through TrustMark, work 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 on 21 October 2026. They are provisional and will be revised, and September’s figures are due on 18 November 2026. Building costs are Checkatrade’s national ranges, last updated in June 2026; they aren’t local prices, and London work usually costs more. Household and tenure figures come from Census 2021, taken on 21 March 2021. Planning details come from the Havering Local Plan 2016–2031 (adopted November 2021), the 2011 Residential Extensions and Alterations SPD and the council’s web pages as they stood when we checked them on 1 November 2026. Check the rules for your own address, and get at least three itemised quotes based on proper drawings before choosing between building and moving.

Sources: UK House Price Index England: August 2026 (GOV.UK); UK HPI data downloads, August 2026 (full file, Havering E09000016); ONS local house prices: Havering; Census 2021 TS044 accommodation type (Nomis); Census 2021 TS054 tenure (Nomis); Checkatrade: house extension costs; Planning Portal: extensions; Planning Portal: loft conversions; Planning Portal: basements; Havering Local Plan 2016–2031 (PDF); Havering Council: Local Plan review; Havering Council: Residential Extensions and Alterations SPD (2011); Havering Council: supplementary planning documents; Havering Council: heritage; Havering Council: conservation areas; Havering Council: Article 4 directions; Havering Council: HMO Article 4 directions; Havering Council: Gidea Park Article 4 direction; 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 1 November 2026.