The full drawing set for a Harrow application — location and block plans, existing and proposed floor plans, elevations and sections, drawn to Harrow Council's validation checklist so the pack is accepted first time, delivered in days and revised free until your decision, with a free approval-odds check first.
Harrow Council granted 83% of the householder planning decisions it made in its latest published year — 4 points below the 87% England-wide householder average. Hip-to-gable conversions dominate because so much of the stock is hipped 1930s semis — roof bulk and the pair's balance are the tests, which is where a policy-literate drawing pack earns its keep. Its dominant Edwardian (1901–1910) and interwar (1918–1939) housing stock sets the design brief on most streets.
The permitted-development ceilings are fixed: 40m³ of new roof volume for a terraced loft and 50m³ for a semi or detached house under Class B, plus a 3m single-storey rear extension on a terrace or 4m on a detached house under Class A. Harrow carries at least one Article 4 direction, and conservation areas including Harrow on the Hill, Pinner High Street and Pinner Village remove those rights outright, so we confirm your exact address before a line is drawn. A validated householder application in Harrow is determined against an 8-week statutory target.
Harrow on the Hill (historic hilltop conservation area), Pinner (the medieval High Street and Metroland semis), Stanmore (detached and semi-detached interwar houses), Wealdstone (Edwardian terraces near the town centre), Rayners Lane (classic Metroland semi-detached estates) and Kenton (1930s hipped-roof semis) — these are the Harrow pockets our drawings cover most. Heritage designations here include Harrow on the Hill, Pinner High Street, Pinner Village, Roxeth and Harrow Weald. Harrow Council weighs each proposal against Harrow Local Plan and the Residential Design Guide SPD, where the borough resists loss of the gaps between semis that define Metroland streets. On roofs the borough is hipped roofs on the 1930s semis and steeper gabled roofs in Pinner village, over interwar Metroland semi-detached houses, Edwardian terraces around the stations and detached homes on the hill.
Whatever you are building, Harrow Council decides it from the same core set. A location plan at 1:1250 fixes the site on the map with the red-line boundary; a block plan at 1:500 shows the property in its plot; then existing and proposed floor plans and elevations at 1:100 or 1:50 show the house as it is and as it will be. Larger schemes add a section and, where policy requires, a design and access statement. Miss one and the application is returned invalid before an officer has looked at it.
The drawings are also the argument. Harrow Council assesses each proposal against Harrow Local Plan and the Residential Design Guide SPD, and the elevations are where the case is won or lost — ridge and eaves heights, window positions, materials and how the change reads from the street. On Harrow's stock, which runs to interwar Metroland semi-detached houses, Edwardian terraces around the stations and detached homes on the hill, the same scheme is drawn differently to answer the concerns officers raise here. Hip-to-gable conversions dominate because so much of the stock is hipped 1930s semis — roof bulk and the pair's balance are the tests, so the pack is built to pre-empt exactly that.
Where the property sits in a conservation area — Harrow on the Hill, Pinner High Street, Pinner Village, Roxeth and Harrow Weald among Harrow's — validation is stricter still, often demanding heritage detail and sometimes additional plans. Harrow on the Hill and the Pinner conservation areas carry tight controls, and several streets have Article 4 directions removing permitted-development rights. We confirm the designation before drawing so the pack meets the higher bar first time.
Harrow Council validates against a published checklist before it assesses anything. A typical householder application needs each of these, correctly scaled and labelled:
We draw the complete set — location and block plans, existing and proposed plans, elevations and any section — to Harrow Council's checklist, then lodge it on the Planning Portal, manage validation and answer case-officer queries so the application is decided on its merits, not bounced on a technicality.
Below is Harrow Council's real householder decision record, drawn from official planning statistics and refreshed as new data lands. Harrow grants a fair share of householder applications, with hip-to-gable roof bulk on Metroland semis and the spacing between paired houses the recurring considerations. A complete, correctly scaled pack that answers those concerns on the elevations is validated faster and refused less often than one that leaves them for the officer to raise.
Source: MHCLG planning application statistics (householder decisions, rolling year). Compare every borough on our London approval-rate league table.
Tell us about your project and get a fixed, no-obligation quote back within one working day. If you don't need planning permission at all, we'll tell you that too — for free.
Two different things sink an application, and they happen at two different stages. First is validation: a missing block plan, an unscaled elevation, no red line, no north point — Harrow Council returns the whole submission and the clock never starts. Getting the pack right at this stage is purely mechanical, and it is where a lot of self-submitted Harrow applications lose weeks. We draw to the checklist so this never happens.
Second is the planning judgement itself, once the pack is valid. The borough resists loss of the gaps between semis that define Metroland streets. Across Harrow on the Hill, Pinner and Stanmore the recurring refusals are about scale, overlooking and how the proposal sits against its neighbours — all of which are settled on the drawings. We draw the scheme to answer them before submission rather than after a refusal.
The application pack is the same discipline whatever the project. A few of the Harrow neighbourhoods and property types we prepare drawings for most often:
Planning drawings for Harrow on the Hill's historic hilltop conservation area — scaled, validation-ready and drawn to Harrow Council's guidance.
Planning drawings for Pinner's the medieval High Street and Metroland semis — scaled, validation-ready and drawn to Harrow Council's guidance.
Planning drawings for Stanmore's detached and semi-detached interwar houses — scaled, validation-ready and drawn to Harrow Council's guidance.
Planning drawings for Wealdstone's Edwardian terraces near the town centre — scaled, validation-ready and drawn to Harrow Council's guidance.
Planning drawings for Rayners Lane's classic Metroland semi-detached estates — scaled, validation-ready and drawn to Harrow Council's guidance.
Planning drawings for Kenton's 1930s hipped-roof semis — scaled, validation-ready and drawn to Harrow Council's guidance.
The route decides what Harrow Council needs and how long it takes. This is how the common Harrow routes compare.
| Route | When it applies | Core drawings | Typical decision |
|---|---|---|---|
| Householder application | Extensions and alterations to a single house | Location, block, existing & proposed plans and elevations | About 8 weeks |
| Full application | Flats, new units, changes of use | As householder plus site plan and often a section | 8–13 weeks |
| Lawful development certificate | Confirming a scheme is permitted development | Existing & proposed plans and elevations to prove PD limits | About 8 weeks |
| Prior approval | Larger single-storey rear extensions | Plans and elevations plus neighbour notification | About 6 weeks |
In a conservation area such as Harrow on the Hill and Pinner High Street, householder permitted-development rights are often restricted, so a full application and heritage detail may be required.
A fixed process built around how Harrow Council validates and decides — most drawing sets are submission-ready within seven days of survey.
Send us your Harrow postcode and what you want to build. We confirm your conservation and Article 4 status, tell you which application route applies, and score your odds against live Harrow Council decisions.
We measure the property and plot so the existing plans and elevations are accurate to the millimetre — the base every proposed drawing and every officer judgement is built on.
Chartered designers produce the full validation pack — location and block plans, existing and proposed plans, elevations, any section and a design and access statement — drawn to Harrow Council's checklist.
We lodge the application on the Planning Portal, manage validation and case-officer queries, and revise the drawings free until Harrow Council issues its decision.
Harrow Council validates a householder application against a set list: a location plan at 1:1250 with a red-line boundary, a block plan at 1:500, and existing and proposed floor plans and elevations at 1:100 or 1:50, each with a scale bar and north point. Larger schemes and most conservation-area work also need a design and access statement. If any of these is missing or unscaled the application is returned invalid before it is assessed.
Almost always because the drawing pack is incomplete or wrongly scaled — a missing block plan, an elevation with no scale, no red line on the location plan, no north point. Harrow Council checks the pack against its validation list before an officer ever assesses the scheme, so these purely technical gaps cost weeks. Drawing to the checklist from the outset is the simplest way to avoid a return.
Yes. We prepare the full drawing set, lodge it on the Planning Portal on your behalf, pay the Harrow Council fee where you prefer us to, and then manage validation and case-officer questions through to the decision. You get the reference number and updates without dealing with the portal or the council yourself.
A householder application is a statutory eight weeks from validation, and a full application eight to thirteen weeks depending on scale. The date that matters is validation, not submission — an invalid pack never starts the clock. Because we draw to Harrow Council's checklist the application validates quickly, so the statutory period begins without the delay a returned pack causes.
You do not strictly need a planning application, but scaled existing and proposed drawings are still worth having: a lawful development certificate from Harrow Council proves the scheme is permitted development, which lenders and buyers increasingly ask for, and your builder needs the drawings to price and build. In a conservation area such as Harrow on the Hill and Pinner High Street, permitted-development rights are often removed, so a full application may be needed after all — we confirm which before you commit.
We price each Harrow job individually — the scope of the survey and the size of the drawing set vary from a simple rear extension to a whole-house scheme — and send a fixed, no-obligation quote within one working day. It covers the full validation pack with free revisions until Harrow Council decides. The Harrow Council application fee is separate and paid to the council. Call 020 7864 7245 to start.
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Same fixed quotes, same fast drawings — wherever your project is.