Measured Building Surveys · HA1 Harrow
Harrow protects the Harrow on the Hill conservation area, dominated by Harrow School and the historic hilltop village, alongside standard suburban householder control across the rest of HA1.
One district of Harrow is covered here. For the whole borough, with fees and timings in full, read measured building surveys in Harrow.
A measured building survey captures your Harrow property exactly — every wall, opening, level and boundary — as the accurate base for design and planning drawings. On HA1's older terraced and villa stock around Harrow, Harrow on the Hill, West Harrow, Greenhill, walls are rarely square, so a laser-measured survey prevents costly errors before Harrow Council ever sees the application.
Capture with a Leica Disto and a BLK360 scanner, delivered in AutoCAD or Revit, produced by MCIAT chartered technologists.
Across Harrow, Harrow on the Hill, West Harrow, Greenhill in HA1, the dominant property is victorian and edwardian houses around harrow on the hill, with inter-war semis toward west harrow and town-centre flats. 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 property, confirm the planning route — Permitted Development, a Lawful Development Certificate, or full planning — and draw a council-ready set tailored to the HA1 streetscape.
Housing stock in HA1: Victorian and Edwardian houses around Harrow on the Hill, interwar semis running out towards West Harrow, and flats through the town centre. Borough-wide the 1930s account for 41.6% of 96,860 homes, and pre-1900 stock for only 2.6%, on VOA council tax figures dated 31 March 2025.
Within the district: Harrow, Harrow on the Hill, West Harrow, Greenhill.
Streets we know in HA1: the streets around Harrow on the Hill and Harrow School, the West Harrow estate roads and the terraces near Harrow-on-the-Hill station. 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 on the Hill, plus the West Harrow and Roxborough fringe. External alteration inside either normally means a planning application with a heritage appraisal attached.
Getting around HA1: Harrow-on-the-Hill carries the Metropolitan line and Chiltern Railways; Harrow and Wealdstone adds the Bakerloo and the West Coast line.
Regeneration: Harrow town centre carries the borough's growth and intensification policy, which raises design expectations on the streets immediately around it.
Property values: £428,000 was the median HA1 sale in 2025, over 327 transactions. Contains HM Land Registry data (c) Crown copyright and database right 2026.
Borough character: suburban outer north-west London, with heritage control on Harrow on the Hill that is stricter than anywhere else in the borough. Elsewhere is looser, though not as loose as the description implies: Harrow granted 2,222 of 2,856 householder applications, 77.8%, where the 33 boroughs pooled granted 83.0%. Roughly one application in five is turned down. Source: MHCLG live planning statistics
One of our chartered technologists surveys the Harrow property with a Leica Disto, adding BLK360 scans where the geometry earns them. A two or three bedroom terrace takes about an hour and a half.
Drawn in AutoCAD, or modelled in Revit where that suits the job, at 1:50 or 1:100 and accurate to plus or minus 3mm point to point. Rooms, openings, fittings, exposed services: all annotated.
All four elevations, and the sections cut through them. Elevations are what Harrow determines an application on; sections are what an engineer and a party wall surveyor actually work from.
The BLK360 records the building as a 3D point cloud, which matters most on Harrow's older houses, on listed fabric, and anywhere the shape of the building will not resolve into a simple rectangle.
Delivered as DWG for CAD, RVT for Revit, PDF for reading and IFC for anyone working in another package. Nothing needs converting downstream.
An accuracy statement accompanies every set, written to what RICS expects: accurate to plus or minus 3mm point to point, with absolute error held inside 5mm. When a validation officer, an insurer or the neighbour's party wall surveyor takes the drawing at face value, that statement is why.
Single planning or building-regs submission.
Planning + building regs + structural.
Listed, conservation or complex sites.
Yes, though the hilltop village is inside the Harrow on the Hill conservation area, where Harrow School dominates the setting and rear extensions, side extensions and roof alterations all require a planning application with heritage justification. We design in period and take it to the council on that basis. Down towards West Harrow and Greenhill, the permitted development route is frequently still available.
Very. The conservation area exists to protect the School buildings, the historic street pattern and a hilltop skyline visible from a long way off, so what an officer assesses is the effect on that setting and on those long views rather than the extension in isolation. We prepare the heritage appraisal and design inside those limits, which is what makes consent a realistic proposition rather than a hope.
Generally yes on the interwar semis around West Harrow and Greenhill: a hip-to-gable, a dormer at the back, the pair of them held within the volume allowance and recorded afterwards on a Lawful Development Certificate. Inside the Harrow on the Hill conservation area, any alteration to the roof needs a planning application. Which of the two governs is a question about your road, and we answer it before drawing.
HA1 runs from interwar semis through to the Victorian and Edwardian houses on and around the Hill. Consented work adds usable family space across that range. Within the hilltop conservation area the standard of drawing required before anything is approved is markedly higher, which is the practical reason to have it done properly.
Put the drawing fee beside a district median of £428,000 and it is not the number that decides the project. Harrow's statutory charge is levied separately and is fixed nationally. The householder application fee in England is £548. A full application costs £610. Our figure is agreed before we start and the survey visit is free anywhere in HA1.
Three to four weeks is the normal run on an HA1 job, from the day you instruct us to the day it is lodged, and that holds in Harrow proper, on the Hill, in West Harrow and in Greenhill alike. Survey in the first week, drawings and revisions across the next two. Validation follows and then eight statutory weeks on a householder application. Every question the case officer raises in that period is answered by us, not by you.
Almost all of HA1 is Harrow — 98.2% of last year's sales — with a small tail into Brent at the southern edge, so Harrow Council determines all but a handful of applications here. There is no Article 4 Direction covering the borough as a whole that removes householder permitted development from a family house, although a condition on an older consent can achieve the same result at one address. Harrow on the Hill, and the West Harrow and Roxborough fringe, are the HA1 conservation areas; inside them the route is a planning application supported by heritage evidence. We confirm every one of those points against your address before we quote.
Nearly always. Building Regulations approval is triggered by any of the following: forming an opening, installing a beam, laying a loft floor, or working at foundation level. Structural adequacy is tested under Part A, escape in a fire under Part B, and insulation under Part L. You may lodge that with the council's own building control department, or instead appoint an approved inspector privately. Given how much of HA1 is terraced and semi-detached, a party wall notice is normally served and answered before any steelwork arrives on site. Our Complete package takes on both.
Yes, on value. 327 HA1 properties sold in 2025 and the middle price was £428,000, on Land Registry price-paid returns. Whether one particular loft or extension returns more than it cost is a question about your house rather than about the district, and no published dataset settles it. The exposure worth avoiding runs the other way: a scheme built without consent, or one Building Control refuses to certify, is what breaks an HA1 sale. Source: HM Land Registry Price Paid Data
Working across a borough boundary, or unsure which council will decide your application? Every service we offer is listed for HA2, HA3, HA5 and HA7.
Pick a slot that suits you. No obligation and no sales pressure, just straight answers on your planning route.
What follows is the part of HA1 we survey, the housing that predominates there, and the council that validates an application drawn from our work. Charges listed there are statutory England rates for 2026: council money, unrelated to what we charge for a survey.
| Postcode | Area | Dominant stock | What it means for a measured building survey |
|---|---|---|---|
| HA1 | Harrow / Harrow on the Hill | Georgian and Victorian houses, listed buildings | The district takes in Harrow itself and Harrow on the Hill, all of it determined by Harrow Council, working to the designations shown on its own policies map, of which the hilltop conservation area is the most consequential. |
| HA1 | Harrow on the Hill | Georgian and Victorian houses, listed buildings | Harrow on the Hill sits inside HA1. A measured survey needs no permission from anyone; it is the dimensioned record of what is already there, and the base any later HA1 application is drawn on. |
| HA2 | North Harrow / South Harrow | 1930s semi-detached | Adjoining district to HA1. 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. |
| HA3 | Harrow Weald / Kenton / Wealdstone | 1930s semi-detached | Adjoining district to HA1. 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 HA1. 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. |
HA1 changes quickly. Neighbouring roads can differ in roof pitch, in wall build-up and in the length of the garden behind the house, and each of them decides what the survey will let you propose.
Conservation areas covering HA1 (Harrow / Harrow on the Hill): Harrow Council runs 29, and Pinner Village, Stanmore, Harrow Weald are the ones HA1 (Harrow / Harrow on the Hill) owners meet most. A measured building survey inside a HA1 (Harrow / Harrow on the Hill) conservation area loses permitted development, so the HA1 (Harrow / Harrow on the Hill) submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Harrow Weald a measured building survey is judged on the street elevation first.
Article 4 and your HA1 (Harrow / Harrow on the Hill) measured building survey: Harrow Council has made no borough-wide direction, so permitted development for a measured building survey in HA1 (Harrow / Harrow on the Hill) generally survives outside HA1 (Harrow / Harrow on the Hill) conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a HA1 owner records that a measured building survey was lawful.
HA1 (Harrow / Harrow on the Hill) 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 HA1 (Harrow / Harrow on the Hill) — 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 HA1 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.
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