TL;DR — Key Facts
- Build cost per sqm: £2,200 – £3,200 (outer London borough)
- Council planning fee: £548 (householder application, 2026)
- Typical projects: rear extension, side-return, two-storey, wraparound
- Conservation areas: 15 designated areas in Havering
- Permitted Development: Generally available outside conservation areas
What does Havering do with an extension application?
Decides it fast: 97.9% inside eight weeks and only 0.6% past thirteen. It approved 81.8% of 3,218 householder decisions. Its Datahub set records 9,406 extension applications at 55% approved, a figure held down by how sparsely the borough populates its outcome field.
| Measure | Havering | London |
|---|---|---|
| Decided inside eight weeks | 97.9% | — |
| Decided beyond thirteen weeks | 0.6% | — |
| Householder approval rate | 81.8% | 83.0% |
| Extension applications in the Datahub | 9,406 | 55% approved |
| Lawful development certificates issued | 1,637 | — |
| Householder planning application fee | £548 | statutory, England 2026 |
Sources: decision figures from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026 — the authoritative source; the Datahub row from the Planning London Datahub, retrieved 15 August 2026, whose ingestion depth differs by borough and whose Havering outcome field is sparsely populated, so read that percentage as a floor. The fee is from the Fees for Applications Regulations 2012 as amended. Build costs on this page are our own 2026 London range.
What does a Havering extension cost in 2026?
The figures here are build costs. For the drawing package itself — scope, fee, timeline — see house extensions in Havering.
Construction on its own costs £2,200 to £3,200 per square metre in Havering, an outer-London range rather than an inner-London one. Professional fees, planning fees and VAT sit outside it. So does the ground: Flood Zone 2 covers 13.1% of the borough and Zone 3 covers 9.88%, following the Ingrebourne and the Thames frontage, and where one applies the council can insist on a Flood Risk Assessment before a builder has priced a thing.
Havering plots are deep, so the temptation is to build further than the permitted limits allow, and the cost of doing that is not just construction - it is the prior-approval route and the risk attached to it. On the build itself, Hornchurch and Upminster semis price conventionally. Harold Hill's trussed-rafter roofs are where a nominally simple job can become a structural one.
Typical extension costs in Havering (build only)
Drawings, structural design and the council's statutory fee all land on top of the build cost. We price the drawings 30% under the usual London architect rate.
What moves the price of a Havering extension?
Havering is permissive about what you build and firm about how you build it: 128 enforcement notices and 25 breach-of-condition notices in three years (MHCLG planning statistics, retrieved 1 September 2026). Breach-of-condition notices follow a permission that was granted and then not complied with, so conditions attached to a Havering consent are worth reading properly. The interwar stock at Hornchurch and Upminster has the side access that keeps groundworks simple.
Conservation areas
Havering has 15 designated conservation areas, Romford Market, Upminster, Hornchurch and Rainham Village among them. Cross a boundary and Permitted Development rights contract, making the £548 full application the probable route. Expect the design to be judged on materials as much as on massing, which is where the build cost climbs: matching brick, timber windows and slate instead of the cheapest compliant alternative usually adds 10-20% to a conservation area job.
Property type
The housing stock in Havering is predominantly 1930s semi-detached dominates hornchurch and upminster; post-war in harold hill and romford; victorian in older romford centre. Victorian and Edwardian terraces typically suit side-return and rear extensions, while 1930s semi-detached properties are well suited to two-storey rear extensions. Detached houses offer the most flexibility but often have larger footprints, meaning higher absolute costs even if the per-sqm rate is similar.
Access and logistics
Hornchurch and Upminster semis generally allow plant to the rear, and the plots are deep enough that a rear extension rarely runs into the boundary. Victorian property around older Romford is tighter. Harold Hill's post-war housing has good vehicle access but frequently a roof and wall construction that changes how the new structure ties in.
Our drawing fees for Havering extensions
At Architectural Drawings London. A fixed fee, never an hourly rate. It buys everything Havering Council needs in order to validate a householder application, and everything an inspector needs for building regulations sign-off.
Drawing fees for extensions in Havering
Each package carries a measured survey of the existing house, floor plans and elevations in both as-existing and as-proposed form, and a site plan. Routes that call for a design and access statement get that written too. MCIAT chartered architectural technologists run the whole sequence, survey through to submission, and handle Havering Council for you.
Havering postcodes we cover: RM1, RM2, RM3, RM4, RM5, RM7, RM11, RM12, RM13, RM14 — Romford out through Hornchurch and Upminster to Rainham and the Havering villages.
Planning or permitted development in Havering?
Permitted Development covers a good deal of Havering extension work outright, with no application of any kind: a single-storey rear extension reaching 6 metres on a terraced or semi-detached house, 8 metres on a detached one, the deeper variants passing through the Prior Approval procedure. Whether a particular address still qualifies depends on what has already been built. Earlier extensions consume the allowance, and the baseline is the house as it originally stood, not as you bought it.
Fifteen conservation areas cover Havering, so the great majority of addresses are unaffected. Where designation applies, the side-extension prohibition is what an owner of a Hornchurch or Upminster semi actually loses, since those plots have the width that makes a side addition attractive. Rear depth is trimmed as well, and cladding changes need an application.
Two-storey extensions almost always need full planning permission, and in Havering that decision is taken by an officer rather than by councillors. Of the 4,739 applications the council determined over twelve quarters to March 2026, 4,702 were settled under delegated powers — 99.2%, against 97.0% for the 33 boroughs pooled. Fewer than forty cases in three years went before a committee. The practical consequence is blunt: lobbying achieves nothing here, and policy compliance achieves everything. Havering expects a two-storey addition to read as subordinate to the original house, to be set in from the side boundary, and to avoid material loss of light or privacy next door. Those are the tests a case officer applies, and the case officer is the person deciding.
Havering issued 1,637 certificates of lawful development in three years (MHCLG planning statistics, retrieved 1 September 2026). In a borough that serves this many breach-of-condition notices, the attraction of the certificate route is that it carries no conditions to breach - it records that the work was permitted, and there is nothing further to discharge afterwards.
Frequently asked questions
How much does a house extension cost in Havering?
Build cost in Havering falls between £2,200 and £3,200 per square metre, the outer-London range. Put 15 to 20 square metres on the back of the house and the construction alone comes out between £33,000 and £64,000. On the value side of the ledger, the median Havering sale in 2025 was £452,000 over 3,206 transactions, with three-quarters of sales below £556,000 (HM Land Registry Price Paid, September 2026).
Can I extend under Permitted Development in Havering?
Plenty of single-storey rear extensions in Havering never reach a planning application at all. Permitted Development reaches 6 metres past the original rear elevation on terraced and semi-detached houses and 8 metres on detached ones, with the deeper versions going through Prior Approval. The borough's 15 conservation areas narrow those rights considerably. Havering determined 674 larger-extension prior approvals in the three years ending March 2026: 91 refused, and 519 told that prior approval was not required at all. Where the route will matter to a future buyer, a Lawful Development Certificate at £274 settles it in advance.
How long does a house extension take in Havering?
Instruction to completion on a Havering extension runs five to eight months. Allow two or three weeks for the measured survey and the drawing set, eight weeks with Havering Council where an application is required, two to four weeks for building regulations, and eight to sixteen weeks on site according to size. The middle stage carries a caveat here. Havering agreed an extension of time on 1,987 of the 4,739 applications it decided over the twelve quarters closing in March 2026 — 41.9%, where the 33 boroughs pooled sit at 34.5%. The eight-week target is renegotiated more often in this borough than across London as a whole.
Do I need a Party Wall Agreement for an extension in Havering?
A Havering semi involves one neighbour; the older Romford terraces involve two. Excavating within three metres of an adjoining foundation at a lower depth is the usual trigger, notifiable a month ahead, and building on the line of junction needs two months. Discharging the planning conditions is a separate obligation and, in this borough, one the council follows up on.
What experience do you have with extensions in Havering?
We prepare extension drawings for properties across all Havering postcodes (RM1, RM2, RM3, RM4, RM5, RM7, RM11, RM12, RM13, RM14). Our MCIAT chartered architectural technologists understand Havering Council's policies, design guides, and local precedents. We have a council-ready drawing review across all 33 London boroughs.
