A construction-ready package for a Harrow property, drawn to satisfy the Approved Documents that govern a domestic build — structure, means of escape, thermal performance and accessible approach — then submitted to the council's own building control team or to your approved inspector, structural calculations already coordinated.
The same Approved Documents as anywhere in England, checked by Harrow’s own team or a registered building control approver. A full plans application must be decided in five weeks, extendable to two months by agreement, with the completion certificate due within eight weeks of completion.
| Requirement | Standard or period | Source |
|---|---|---|
| External wall, new thermal element | 0.18 W/m²K | Approved Document L, Volume 1 |
| Roof, new thermal element | 0.15 W/m²K | Approved Document L, Volume 1 |
| Windows and doors | 1.4 W/m²K | Approved Document L, Volume 1 |
| Kitchen extract with a cooker hood | 30 l/s | Approved Document F |
| Full plans decision | 5 weeks, or 2 months by agreement | Building Regulations 2010, reg 14 |
| Building regulations package | from £840 | our fixed fee |
Sources: Approved Document L, Volume 1 (2021 edition, incorporating the 2023 amendments) and Approved Document F, Volume 1 (2021 edition); the Building Regulations 2010 (as amended), regulation 14. Read at 1 September 2026. The package fee is our own published fixed fee. Building control is entirely separate from planning: Harrow delegates only 87.3% of its planning decisions to officers, the lowest rate in London, but that affects the planning timetable and not this one.
Building regulations drawings in Harrow, a borough of 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, are the full measured-survey-to-submission drawing set London Borough of Harrow needs in order to determine an application: existing and proposed plans, elevations and sections at 1:100 and 1:50, a location and site plan, and the supporting statements the case officer asks for.
Prepared and reviewed by the chartered technologist team at Architectural Drawings London — MCIAT chartered, £2m PI insured.Last reviewed 2026-08-03.


A construction-ready drawing package compliant with every Approved Document — Part A structure, Part B fire, Part L thermal, Part M accessibility — submitted to LABC or your approved inspector with structural calculations coordinated.
Housing stock in Harrow: 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.
Character: Outer north-west London suburban; Harrow on the Hill has exceptionally strict heritage controls; rest of borough permissive.
Plans, sections and elevations at 1:50, annotated to the point where a contractor can price them and an inspector can check them without ringing us. Materials, junction details and specification are named on the sheets themselves.
U-values calculated for the wall, roof, floor and glazing build-ups, an SAP or SBEM run where the work triggers one, and a written compliance statement an inspector can sign against.
Chartered engineer sign-off on beams, pad foundations, lintels, roof structure.
Escape routes, compartmentation, smoke alarms, fire-rated construction detail.
Soil and vent pipe routes, MVHR coordination, EV charging (Part S).
Full Plans go to Harrow Council Building Control or to an approved inspector, and we run the inspection sequence from first site visit through to the completion certificate. Nothing in that process ever reaches a committee: building control is a technical assessment against the Approved Documents, settled by an officer or an inspector on what the drawings show.

Single planning or regs submission.
Planning + building regs + structural.
Listed, conservation, complex sites.
Move the controls for an indicative figure. It anchors your budget — it is not a quote. Every project is priced after a free survey.
Build costs are separate and quoted by your contractor. See our published fees.
Which Harrow districts we draw in, what each is mostly built from, and who signs a building regulations package off there. Where a pound figure appears it is the 2026 statutory England planning charge; drawing fees and construction costs are nowhere in this table.
| Postcode | Area | Dominant stock | What it means for a building regulations package |
|---|---|---|---|
| HA1 | Harrow / Harrow on the Hill | Georgian and Victorian houses, listed buildings | Harrow and Harrow on the Hill fall entirely inside HA1, so an application from that district is validated by the borough itself. |
| HA2 | North Harrow / South Harrow | 1930s semi-detached | North Harrow and South Harrow sit in HA2, wholly within the borough, so Harrow's own Local Plan and its building control team both apply. |
| HA3 | Harrow Weald / Kenton / Wealdstone | 1930s semi-detached | HA3 takes in Harrow Weald, Kenton and Wealdstone, all inside the borough. One authority and one set of policies, whichever of the three a property sits in. |
| HA7 | Stanmore | 1930s semi-detached, Edwardian villas | Stanmore occupies HA7 and is determined by Harrow under its own Local Plan, with the interwar and post-war housing there setting most of the detailing questions. |
| HA5 | Pinner / Eastcote | Tudor fragments, Edwardian villas, 1930s semi-detached | HA5 is divided between Hillingdon and Harrow across Pinner and Eastcote. The planning half turns on which side the plot falls; the building regulations half does not, since an approved inspector can act either side of that line. |
Pitch, wall build-up and plot depth change from one Harrow road to the next, and each of them changes what a building regulations package has to demonstrate at that address.
Conservation areas covering Harrow: Harrow Council runs 29, and Harrow Weald, Harrow on the Hill, Pinner Village are the ones Harrow owners meet most. A building regulations package inside a Harrow conservation area loses permitted development, so the Harrow submission is a householder application at £548 decided in 8 weeks — not a £249 prior approval decided in 6 weeks. In Harrow on the Hill a building regulations package is judged on the street elevation first.
Article 4 and your Harrow building regulations package: Harrow Council has made no borough-wide direction, so permitted development for a building regulations package in Harrow generally survives outside Harrow conservation areas and listed curtilages. A Lawful Development Certificate at £274 is how a HA1 owner records that a building regulations package was lawful.
Harrow 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 building regulations package route in Harrow — 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 Harrow building regulations package 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.
What Harrow owners ask us about building regulations drawings, with the answers we would give them on the phone.
Start a free quote →Both routes are open to you here: the council's in-house service, or a private approved inspector. Whichever you choose, the certificate issued at the end is equally valid in law. The differences are turnaround and how each prefers the drawings presented, so we ask which one your builder already works with before submitting.
Scope sets the building regulations fee. An extension or a loft on a standard Harrow semi is the baseline; an HMO, a flat conversion or a basement conversion carries more detailing and more coordination, so it is priced above that. Structural calculations follow the intervention — a single beam over a knocked-through wall is a fraction of a full loft or an underpinning scheme. See our fees.
Yes. A habitable loft needs Building Regulations approval anywhere in England, covering escape in fire, the strength of the new floor, insulation and the staircase. That is a separate question from whether you also need planning permission: a loft can be permitted development and still fail building control, and on a first submission it often does.
Part L fixes the minimum on insulation, glazing, air permeability and heating efficiency, and a new extension in Harrow has to meet the 2025 uplift on the way to the Future Homes Standard. That bites hardest on the borough's interwar housing: 41.6% of Harrow's homes date from 1930 to 1939 (VOA CTSOP4.1 at 31 March 2025), built with solid or early cavity walls whose junctions need thinking about rather than copying. Full calculations and a compliance statement sit inside every Complete package.
Harrow Council Building Control usually returns a Full Plans decision in 5 to 8 weeks; approved inspectors commonly turn one round in 2 to 4. Site inspections then run through the build, typically 6 to 10 visits depending on scope. None of that is touched by the committee route that can hold up the planning half of the same project.
Approval is needed for a loft conversion, an extension, structural alteration, a re-roof, a new opening in a load-bearing wall, and effectively any work inside a flat. Like-for-like replacement and a small porch are among the exemptions. We confirm which of those applies at the free site visit, because getting it wrong tends to surface years later, at conveyancing.
The completion certificate is the document that proves the work complies. Harrow Council Building Control or your approved inspector issues it once the final inspection passes, and a conveyancer or a lender will ask to see it when the house is sold or remortgaged. We manage the inspection sequence and chase the sign-off through to issue.
Work that changes how a house holds heat — an extension, a loft, new glazing — feeds into an updated EPC, or into the SAP or SBEM calculation that demonstrates Part L compliance. Those calculations sit inside the Complete and Bespoke packages rather than being charged as an extra.

If your property sits on a boundary, here are the neighbouring options.
One chartered team handles the survey, the planning route and the building regulations set for a Harrow project. Keeping those together matters more here than in most of London, because Harrow puts an unusually large slice of its planning work in front of elected members: across 2023-24 to 2025-26 it delegated 3,611 of 4,137 decisions to officers, leaving 12.7% for committee where the 33 boroughs pooled leave 3.0% (MHCLG planning statistics, retrieved 1 September 2026).
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