Updated 26 July 2026 · 76 new leads in the last 30 days
Construction Leads in Harrow
Pick up construction leads in Harrow as soon as they hit the planning register. See exactly which homeowners across the borough are gearing up to build, and get in front of them before a shortlist forms.
- Drawn straight from Harrow Council planning decisions
- Reach homeowners before they start comparing builders
- Direct contact only - no shared enquiry lists
Data sourced from Harrow Council planning records and kept up to date.
76
New Leads (30 Days)
£164,145
Average Project Value
34
High Value Projects
Over £100k
Extensions
Most Common Project
Construction Trends in Harrow
Many households in Harrow are looking to fit more people into the same footprint, which shows up clearly in the planning register - loft conversions and rear extensions to add extra bedrooms are constant across Kenton, Wealdstone, and Rayners Lane. Pinner and Harrow-on-the-Hill sit in conservation areas, so applications there tend to be more detailed, covering roof alterations and extensions designed to match the existing character. Stanmore's larger detached plots bring through bigger jobs, including double-storey side extensions and full-scale renovations.
Project Type Breakdown
Here is what the recent planning submissions in Harrow look like broken down by project type, so you can see where the work is actually landing.
In Harrow, Extensions account for the majority of planning applications (69 of 96 in the last 30 days), with Garage Conversions also showing consistent demand alongside Porches.
Project Value Insights
Sorting Harrow applications by likely project value makes it quicker to prioritise the jobs worth your time rather than working through every listing.
- £25k – £50kGarage conversions, small loft rooms, and driveway or outbuilding work
- £50k – £100kStandard loft conversions and single-storey rear extensions
- £100k – £250kDouble-storey extensions, wraparounds, and full internal renovations
- £250k+Large detached-home renovations and major structural rebuilds
The bigger budgets tend to sit around Stanmore, Harrow Weald, and Harrow-on-the-Hill, where larger plots and higher household incomes support more ambitious projects.
Recent Planning Applications in Harrow
Extensions
| Project Type | Area | Est. Value | Description | Status |
|---|---|---|---|---|
| Extension | London | £250k–£1m | Outline application for a three storey extension to an existing block of flats. | Pending |
| Single Storey Rear Extension | Greater London | £50k–£100k | Single storey rear extension, 4.50m deep with a maximum height of 3.00m. | Pending |
| Double Storey Extension | Greater London | £100k–£250k | Two storey rear extension at lower ground floor and ground floor level. | Pending |
| Double Storey Extension | Greater London | £100k–£250k | Multiple extensions including two storey rear and front porch. | Pending |
| Wrap-Around Extension | Greater London | £50k–£100k | Alterations to front porch and single storey side to rear extension. | Pending |
Extension
London
Outline application for a three storey extension to an existing block of flats.
Single Storey Rear Extension
Greater London
Single storey rear extension, 4.50m deep with a maximum height of 3.00m.
Double Storey Extension
Greater London
Two storey rear extension at lower ground floor and ground floor level.
Double Storey Extension
Greater London
Multiple extensions including two storey rear and front porch.
Wrap-Around Extension
Greater London
Alterations to front porch and single storey side to rear extension.
Loft Conversions
| Project Type | Area | Est. Value | Description | Status |
|---|---|---|---|---|
| Loft Conversion | Greater London | £50k–£100k | Proposed alterations and extension to roof including dormer and rooflights. | Pending |
Loft Conversion
Greater London
Proposed alterations and extension to roof including dormer and rooflights.
Other Projects
| Project Type | Area | Est. Value | Description | Status |
|---|---|---|---|---|
| Dropped Kerb | Greater London | £25k–£50k | Proposal for vehicle access. | Pending |
| Garage Conversion | Greater London | £25k–£50k | Conversion of garage to habitable room with external alterations. | Pending |
| Dropped Kerb | Greater London | £250k–£1m | Demolition and redevelopment for a detached two-storey dwelling with habitable roof space. | Pending |
| Porch | Greater London | £25k–£50k | Proposed alterations to roof including end gable and rear dormer, plus front porch. | Pending |
| Garden Room | Greater London | £25k–£50k | Certificate of Lawful Proposed Development for a single storey detached outbuilding for storage. | Pending |
Dropped Kerb
Greater London
Proposal for vehicle access.
Garage Conversion
Greater London
Conversion of garage to habitable room with external alterations.
Dropped Kerb
Greater London
Demolition and redevelopment for a detached two-storey dwelling with habitable roof space.
Porch
Greater London
Proposed alterations to roof including end gable and rear dormer, plus front porch.
Garden Room
Greater London
Certificate of Lawful Proposed Development for a single storey detached outbuilding for storage.
Data sourced from Harrow Council planning records and kept up to date.
Featured Projects
A rundown of construction opportunities currently working their way through the Harrow planning system.
Outline application (Scale only) for three storey extension to existing block of flats
£250k–£1mLondon
Outline application for a three storey extension to an existing block of flats.
Single storey rear extension: 4.50 metres deep, 3.00 metres maximum height and 2.80 metres high to the eaves
£50k–£100kGreater London
Single storey rear extension, 4.50m deep with a maximum height of 3.00m.
Two storey rear extension at lower ground floor and ground floor level
£100k–£250kGreater London
Two storey rear extension at lower ground floor and ground floor level.
Single storey front extension incorporating porch; single and two storey side to rear extension; single storey rear extension; rooflight in front roof slope; external alterations
£100k–£250kGreater London
Multiple extensions including two storey rear and front porch.
Recently submitted Harrow applications worth a follow-up call.
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Get Access NowPlanning Application Outcomes in Harrow
0%
Approved
100%
Pending
0%
Rejected
In Harrow, 0% of planning applications are approved, 100% are still pending, and 0% are rejected. Contacting homeowners early gives you the best chance of winning work.
Reaching out while applications are still active helps you get ahead of the pack.
Based on planning application outcomes over the last 3 months.
Planning Approval Times in Harrow
In Harrow, most planning applications are decided within 9 weeks. Smaller projects like extensions tend to be approved more quickly, while larger developments can take longer.
Domestic vs Commercial Projects in Harrow
In Harrow, the vast majority (96%) of planning applications are domestic projects such as extensions and loft conversions. Commercial developments make up a smaller portion but can offer higher-value opportunities for larger contractors.
Demand for Building Work in Harrow
A lot of Harrow families are multi-generational, and adding a bedroom or an annexe is often cheaper and less disruptive than two households buying separately in a borough where property prices have climbed steadily. That keeps demand for building work fairly resilient even when the wider housing market slows down, since the driver is space rather than simply wanting a nicer kitchen.
How to Win Jobs in Harrow
Contact Homeowners Early
A fresh planning application is the clearest early signal that a homeowner is ready to build - contacting them at that point beats waiting to be invited to quote.
Focus on Approved Applications
Prioritise leads that have already received planning approval. These homeowners are ready to hire and start work.
Target Higher-Value Projects
Filter for projects over £50k. Fewer builders compete for larger jobs, giving you better margins and longer contracts.
How BuildAlert Works
A quick guide to turning Harrow planning data into actual building work.
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Nearby Areas
Harrow borders several boroughs with a similar mix of suburban housing, so builders based here usually pick up work across the wider area rather than staying inside one postcode.
Frequently Asked Questions
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