Measured Building Surveys · HA3 Harrow Weald
Harrow applies standard suburban householder control across most of HA3, with conservation and green-belt interest toward Harrow Weald Common and Grimsdyke in the north.
A Harrow case officer, or a committee: Harrow delegated only 87.3% of its decisions, the lowest rate in London against 97.0% across the capital. So roughly one HA3 application in eight goes before councillors, which adds weeks to the timetable.
| Measure | Harrow | London |
|---|---|---|
| Decisions made under delegated powers | 87.3% | 97.0% |
| Householder approval rate | 77.8% | 83.0% |
| Householder decisions made | 2,856 | 77,680 |
| Decided inside eight weeks | 91.0% | — |
| Conservation areas | 27 covering 402 ha | 1,141 across London |
| Measured survey, floor plans from | £245 | our fixed fee |
Sources: decision figures from MHCLG District Planning Application Statistics (PS1 and PS2), twelve quarters to March 2026; conservation areas from planning.data.gov.uk, retrieved 1 September 2026; the survey fee is our own published fixed fee. Harrow’s return carries a suspected reporting spike on its listed-building works certificates, so no figure from that field is quoted here.
Harrow Weald HA3 — local contextIf the property sits outside this district, our borough-level page for measured building surveys in Harrow covers every ward on the same fee basis.
A measured building survey captures your Harrow Weald property exactly — every wall, opening, level and boundary — as the accurate base for design and planning drawings. On HA3's older terraced and villa stock around Kenton, Wealdstone, Harrow Weald, Belmont (Harrow), walls are rarely square, so a laser-measured survey prevents costly errors before Harrow Council ever sees the application.
Point-cloud scanning with a BLK360 alongside Leica Disto measurement, issued in AutoCAD and Revit by a chartered MCIAT practice working across this district and the rest of Harrow.
Across Kenton, Wealdstone, Harrow Weald, Belmont (Harrow) in HA3, the dominant property is inter-war semis and terraces around kenton, wealdstone and harrow weald, with larger houses toward the green belt. That stock shapes what measured building survey looks like here: the right approach for a period terrace differs from a mansion-block flat or a new-build, and Harrow Council judges each on design quality and neighbour impact. We survey the specific Harrow Weald property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the HA3 streetscape.
Housing stock here: inter-war semis and terraces through Kenton, Wealdstone and Harrow Weald, with larger detached houses out towards the green belt fringe. Solid and early cavity walls, shallow bay projections, and original plans that rarely match what has actually been built since.
Within the district: Kenton, Wealdstone, Harrow Weald, Belmont (Harrow).
Streets we know in HA3: the Kenton estate roads, the streets around Wealdstone and the larger plots toward Harrow Weald Common. Each road has its own building line, boundary treatment and precedent that Harrow Council weighs when assessing a measured building survey scheme.
Conservation areas: Harrow Weald, around the Common and the Grimsdyke fringe. Inside the boundary most external alteration has to go in as a full application backed by a heritage statement, and an accurate record of existing condition is what that statement rests on.
Getting around: Kenton, Harrow & Wealdstone and Headstone Lane give Bakerloo line, Overground and Southern services, which is much of the reason this is commuter family housing rather than anything else.
Regeneration: Harrow Weald sits on the edge of the Wealdstone and Harrow town-centre regeneration area, which shapes the design expectations officers bring to householder schemes nearby.
Property values: unusually, the average sale in HA3 last year came in below the midpoint — a mean of £540,615 against a median of £550,500, on Land Registry price-paid records. That pattern suggests a market without many very high-value sales pulling the average upwards.
Borough character: outer north-west London suburbia, overwhelmingly inter-war — 41.6% of Harrow's 96,860 homes were built in the 1930s, as counted in the VOA stock tables for 31 March 2025. Harrow on the Hill is the strict heritage exception; most of the rest of the borough is comparatively permissive.
A chartered technologist runs the site visit, using a BLK360 laser scanner alongside a Leica Disto. A typical 3-bed semi in Harrow Weald or Kenton takes around 90 minutes, and you need not be there for the whole of it.
Issued as AutoCAD or Revit files at 1:50 or 1:100 and accurate to plus or minus 3mm point to point, annotating rooms, openings, fittings and visible services rather than leaving any of them to be inferred.
All four elevations and cross-sections through the building, drawn from measured data. Nothing else can start without them — not the planning submission, not the party wall award, not the structural design.
A BLK360 pass captures the building as a full 3D point cloud, which earns its cost back on the older stock near the Common, on anything listed, and on the 1930s bay-fronted semis where no two rooms turn out to be quite square.
One model, four outputs — DWG, RVT, PDF and IFC — so the architect, the engineer and the builder each open the survey natively and nobody has to redraw it.
A written accuracy report to RICS conventions travels with the set: accurate to plus or minus 3mm point to point, and inside 5mm absolute over the whole building. An insurer, a council, or the party wall surveyor acting between neighbours, will each accept it on that basis without asking for the work to be done twice.
Single planning or building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
Because this is a settled family market — inter-war semis and terraces through Kenton, Wealdstone and Harrow Weald, on plots that suit rear and side extensions and hip-to-gable lofts. Outside the northern conservation and green belt fringe most of that work still runs under permitted development rights, which we certify with a Lawful Development Certificate. The fee for a lawful development certificate is £274.
North towards Harrow Weald Common and Grimsdyke, plots can sit in or against the Metropolitan Green Belt, where enlarging a footprint is very hard to justify. Whether a plot is washed over gets checked before design begins. South of that line, in the built-up area covering 75.1% of the borough's land, ordinary householder and permitted development rules apply.
On the inter-war semis, usually. The standard scheme is a hip-to-gable with a rear dormer sized to stay inside the volume allowance, then put beyond doubt with a lawful development certificate. On site we measure the head height from ceiling joists to the underside of the ridge and check whether the plot picks up a northern conservation or green belt constraint. The same survey then feeds the Building Control drawings.
Property in this district changed hands at a median of £550,500 across 352 recorded sales in 2025, on the Land Registry's price paid returns. That is what the survey is protecting. A measured drawing set is a few hundred pounds sitting underneath an extension or loft decision on an asset at that value, and it is the cheapest part of the whole job to get right. Contains HM Land Registry data (c) Crown copyright and database right 2026
Harrow Council charges its own statutory application fee (currently £548 for a householder planning application, £610 for a full application). We quote the drawings as one fixed price and the free site survey covers every HA3 address.
Across Kenton, Wealdstone, Harrow Weald and Belmont, allow three or four weeks between being instructed and lodging the application: survey first, then drawings and your revisions over the following fortnight, then validation and the 8-week statutory determination by Harrow Council. Worth knowing that Harrow delegates fewer decisions to officers than most London boroughs, 3,611 of 4,137 against 97.0% pooled across the capital, so a slightly larger share reaches committee. We carry the application through officer queries either way.
Harrow Weald (HA3) sits primarily in Harrow, so applications are decided by Harrow Council. Conservation areas within HA3 include Harrow Weald (Grimsdyke / Common fringe), where full planning and a Heritage Statement are required. We confirm the planning route for your exact address before quoting.
Almost always. Structural work following on from a survey — forming openings, installing steel, building a loft floor, underpinning — requires Building Regulations approval — Part A structure, Part B escape, Part L insulation — lodged either with Harrow Council Building Control or with a private approved inspector. Given how much of this district is semi-detached or terraced, party wall notices generally have to reach the neighbours before any steel does. We coordinate both within the Complete package.
In value terms, yes. The bigger risk is an unapproved or non-compliant scheme — which is why council-ready drawings and a clean Building Control sign-off matter on HA3 homes.
If your site sits close to the edge of the borough, it is worth checking the authority next door. Browse everything we do in HA1, HA2, HA5 and HA7.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
This district is not entirely Harrow: roughly three quarters of its recorded property sales fall inside the borough, with the remainder in Brent around Kenton. Each row below covers an area we survey, the build type that prevails there, and whose planning department a later application would reach. Any fee shown is the nationally set 2026 application charge.
| Postcode | Area | Dominant stock | What it means for a measured building survey |
|---|---|---|---|
| HA3 | Harrow Weald / Kenton / Wealdstone | 1930s semi-detached | This one has no determining body at all. What governs it is the accuracy the later drawings need. HA3 runs through Harrow Weald, Kenton and Wealdstone in long rows of 1930s semis, where a bay front and a side return rarely match the neighbour's as closely as they look. |
| HA3 | Harrow Weald | 1930s semi-detached | Harrow Weald lies within this district and inside the London Borough of Harrow, so Harrow Council handles any application arising from the survey. |
| HA3 | Kenton | 1930s semi-detached | Kenton uses HA3 addresses but sits against the Brent boundary, so it is worth establishing which of the two councils would receive an application before the drawings are finalised. |
| HA3 | Wealdstone | 1930s semi-detached, post-war flats | Wealdstone is wholly inside both the district and the borough, on the edge of the town-centre regeneration area that shapes local design expectations. |
| HA1 | Harrow / Harrow on the Hill | Georgian and Victorian houses, listed buildings | Adjoining district to HA3. Surveying needs no consent here either — Harrow has no say in it, and the survey is the same record whichever side of the line the property sits. |
| HA2 | North Harrow / South Harrow | 1930s semi-detached | Adjoining district to HA3. Surveying needs no consent here either — Harrow has no say in it, and the survey is the same record whichever side of the line the property sits. |
| HA7 | Stanmore | 1930s semi-detached, Edwardian villas | Adjoining district to HA3. Surveying needs no consent here either — Harrow has no say in it, and the survey is the same record whichever side of the line the property sits. |
On inter-war semis the roof pitch, the wall build-up and the depth of the rear plot are what decide a scheme, and all three change from one road to the next. They are measurements, not assumptions, which is the entire argument for surveying before designing.
How designation changes a HA3 (Harrow Weald / Kenton / Wealdstone) measured building survey: Harrow Council maintains 29 conservation areas, including Pinner Village, Stanmore, Harrow Weald. Inside any of them a HA3 (Harrow Weald / Kenton / Wealdstone) measured building survey cannot rely on permitted development, and the route becomes a £548 householder application determined in 8 weeks rather than a £249 prior approval in 6 weeks. Pinner Village sets the tone for HA3 (Harrow Weald / Kenton / Wealdstone) casework.
Article 4 and your HA3 (Harrow Weald / Kenton / Wealdstone) measured building survey: Harrow Council has made no borough-wide direction, so permitted development for a measured building survey in HA3 (Harrow Weald / Kenton / Wealdstone) generally survives outside HA3 (Harrow Weald / Kenton / Wealdstone) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a HA3 owner records that a measured building survey was lawful.
HA3 (Harrow Weald / Kenton / Wealdstone) housing stock: 1930s semi-detached dominates; Edwardian villas in Harrow on the Hill and Pinner; Metropolitan Green Belt in Stanmore and Harrow Weald; post-war flats around Harrow Central. Outer north-west London suburban; Harrow on the Hill has exceptionally strict heritage controls; rest of borough permissive. Read that before choosing a measured building survey route in HA3 (Harrow Weald / Kenton / Wealdstone) — construction, not postcode, sets what is achievable. Harrow Council charges £548 for a householder application and has 8 weeks to determine it.
Sources for this HA3 measured building survey 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.
Free fixed quote in 60 seconds. MCIAT chartered.
Get my free quote →Or contact us about your project firstBefore you commit, 30% below London architects and seeing why work with us. You can find your service to find the right fit, or create a free account to track your project. When you are ready, get a quote in minutes — most homeowners have a fee in minutes — or contact us for a chat and a chartered technologist will be in touch.
