Updated 8 October 2026 · 156 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.
156
New Leads (30 Days)
£117,949
Average Project Value
47
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 are the most common project type, appearing in 130 of the 156 leads tracked in the last 30 days, with Porches also showing consistent demand alongside Garden Rooms. Projects can fall into more than one category, so these figures don't need to add up to the total.
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 |
|---|---|---|---|---|
| Single Storey Rear Extension | Greater London | £50k–£100k | Proposal for a single storey rear extension. | Pending |
| Extension | Greater London | £250k–£1m | Change of use from dwelling to a six room, six person HMO. | Pending |
| Rear Extension | Greater London | £50k–£100k | First floor rear extension with Juliette balcony and external alterations. | Pending |
| Single Storey Rear Extension | Greater London | £50k–£100k | Single storey rear extension following demolition of existing rear extension. | Pending |
| Single Storey Front Extension | Greater London | £250k–£1m | Single storey front extension, garage conversion, and rear extensions. | Pending |
Single Storey Rear Extension
Greater London
Proposal for a single storey rear extension.
Extension
Greater London
Change of use from dwelling to a six room, six person HMO.
Rear Extension
Greater London
First floor rear extension with Juliette balcony and external alterations.
Single Storey Rear Extension
Greater London
Single storey rear extension following demolition of existing rear extension.
Single Storey Front Extension
Greater London
Single storey front extension, garage conversion, and rear extensions.
Loft Conversions
| Project Type | Area | Est. Value | Description | Status |
|---|---|---|---|---|
| Loft Conversion | Greater London | £100k–£250k | Single- and two-storey side extension with rear dormer; roof altered to form rear dormer and rooflights to front slope; external alterations. | Pending |
| Loft Conversion | Greater London | £50k–£100k | Alterations and extension to roof to form end gable, rear dormer, two front rooflights, new window in end gable and external alterations. | Pending |
| Loft Conversion | Greater London | £50k–£100k | Roof alterations with L-shaped wrap-around side-to-rear dormer to create habitable roof space for first-floor flat, including two front rooflights and external alterations. | Pending |
| Loft Conversion | Greater London | £250k–£1m | Convert single dwelling into four flats (2 studios, 1 x 1-bed, 1 x 2-bed) with single-storey rear extensions, two-storey side extension and roof alterations including rear dormers and front rooflights. | Pending |
| Loft Conversion | Greater London | £100k–£250k | Single- and two-storey rear extensions with rear dormer, rooflights in side slopes and external alterations. | Pending |
Loft Conversion
Greater London
Single- and two-storey side extension with rear dormer; roof altered to form rear dormer and rooflights to front slope; external alterations.
Loft Conversion
Greater London
Alterations and extension to roof to form end gable, rear dormer, two front rooflights, new window in end gable and external alterations.
Loft Conversion
Greater London
Roof alterations with L-shaped wrap-around side-to-rear dormer to create habitable roof space for first-floor flat, including two front rooflights and external alterations.
Loft Conversion
Greater London
Convert single dwelling into four flats (2 studios, 1 x 1-bed, 1 x 2-bed) with single-storey rear extensions, two-storey side extension and roof alterations including rear dormers and front rooflights.
Loft Conversion
Greater London
Single- and two-storey rear extensions with rear dormer, rooflights in side slopes and external alterations.
Other Projects
| Project Type | Area | Est. Value | Description | Status |
|---|---|---|---|---|
| Garden Room | Greater London | £25k–£50k | Certificate of Lawful Proposed Development for a single storey detached outbuilding for storage. | Pending |
| Garage Conversion | Greater London | £50k–£100k | Conversion of garage to habitable room with raised roof height. | Pending |
| Porch | Greater London | £25k–£50k | Application for a front porch. | Pending |
| Garden Room | Greater London | £25k–£50k | Retrospective application for a single storey outbuilding in the rear garden. | Pending |
| Garden Room | Greater London | £25k–£50k | Erection of a single-storey detached rear outbuilding with attached veranda for use as a gym. | Pending |
Garden Room
Greater London
Certificate of Lawful Proposed Development for a single storey detached outbuilding for storage.
Garage Conversion
Greater London
Conversion of garage to habitable room with raised roof height.
Porch
Greater London
Application for a front porch.
Garden Room
Greater London
Retrospective application for a single storey outbuilding in the rear garden.
Garden Room
Greater London
Erection of a single-storey detached rear outbuilding with attached veranda for use as a gym.
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.
Single storey rear extension
£50k–£100kGreater London
Proposal for a single storey rear extension.
Single and two storey side to rear extension; single storey rear extension; change of use: dwelling (C3) to a six room, six person HMO (C4)
£250k–£1mGreater London
Change of use from dwelling to a six room, six person HMO.
First floor rear extension; Juliette balcony; external alterations
£50k–£100kGreater London
First floor rear extension with Juliette balcony and external alterations.
Single storey rear extension (Demolition of rear extension)
£50k–£100kGreater London
Single storey rear extension following demolition of existing rear extension.
Recently submitted Harrow applications worth a follow-up call.
See All 156 Construction Leads in Harrow
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Get Access NowPlanning Application Status in Harrow
0%
Approved
100%
Pending
0%
Refused
In Harrow, 0% of planning applications are approved, 100% are still pending, and 0% are refused. Pending applications can give builders an opportunity to make contact while projects are still at an early stage.
Reaching out while applications are still active helps you get ahead of the pack.
Based on planning applications submitted over the last 30 days.
Planning Approval Times in Harrow
Among applications tracked by BuildAlert in Harrow, the median time from submission to decision is 8–10 weeks. Smaller projects like extensions tend to be approved more quickly, while larger developments can take longer.
Based on approved applications with recorded decision dates over the last 3 months.
Domestic vs Commercial Projects in Harrow
In Harrow, the vast majority (93%) 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
Approved applications can be particularly valuable because the project has cleared a major planning hurdle and may be moving closer to construction.
Target Higher-Value Projects
Filter by estimated project value to focus your outreach on jobs that match the size and type of work your business takes on.
How BuildAlert Works
A quick guide to turning Harrow planning data into actual building work.
Track Planning Applications
We monitor Harrow Council and surrounding authorities daily for new residential projects.
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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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