Two-storey rear extension planning approval rate in Harrow
74% of 1,110 decided two-storey rear extension applications in Harrow were approved.
Checked against 20.6 million UK planning applications on file across 420 planning authorities. Approval rates from 2,343,419 decisions we classified across 181 councils in England.
A similar project nearby can help you understand the council's decisions. Its outcome does not establish what will be acceptable at your address.
74%
Approval rate, all years, from 1,110 decided
1,110
decided two-storey rear extension applications in Harrow: 821 approved, 289 refused
67%
Recent rate, decided since 2022, from 707 decided
How to read these rates
These are historical outcomes for the applications in our archive, not the chance of approval for your property. Compare the same project type and read the decided count alongside each percentage.
About the planning data
Rate = approved divided by approved plus refused, using the decisions in our classified archive. Rates are withheld as unknown where fewer than 8 records of that project type were decided. Withdrawn applications are excluded.
Recent means records dated 2022 or later. Records without a year are excluded from the recent rate but remain in the all-years figure. Historical coverage varies by council, and duplicate application references may remain in the archive.
Approval rates from 2,343,419 decisions we classified across 181 councils in England. The wider 20.6 million application catalogue is accessible through PlanIT; it is not the dataset used to calculate these percentages.
Read the full methodology and coverage notes.
Project types and outcomes are classified from council records. Check the original application and decision notice before relying on an individual example. A page rebuild does not mean every council record has just been refreshed.
Example two-storey rear extension decisions in Harrow
These examples deliberately include approved and refused applications where available. They are not a representative sample or a list of the latest decisions. Look up each reference on the council's planning search to read the plans and decision notice.
| Reference | Year | Decision | Application |
|---|---|---|---|
| PL/0441/25 | 2025 | Approved | Conversion of garage to habitable room, Replacement of garage door with windows in front elevation, Two storey side to rear extension, Single storey rear ext... |
| PL/0621/25 | 2025 | Approved | Single and two storey rear extension; alterations to roof; alterations and extension to raise roof height of garage; part conversion of garage to habitable r... |
| PL/0629/25 | 2025 | Refused | First floor rear extension |
| PL/0708/25 | 2025 | Approved | Porch canopy to front, Single and two storey side extension, Single storey rear extension, Roof lights in side and rear roof slopes, Alterations to roof of r... |
| PL/0767/25 | 2025 | Refused | First floor rear extension, External alterations |
| P/1814/23 | 2024 | Refused | Remodelling of existing house: two storey side to rear extension with front balcony and rear roof terrace; single storey rear extension with roof terrace; al... Melodies |
About the planning data
Checked against 20.6 million UK planning applications on file across 420 planning authorities. Approval rates from 2,343,419 decisions we classified across 181 councils in England.
Other project types in Harrow
- Single-storey rear extension 74%, 1,909 decided
- Wraparound extension 87%, 119 decided
- Side extension 72%, 499 decided
- Loft conversion and dormer 74%, 223 decided
- Rooflight 80%, 775 decided
- Outbuilding and garden room 72%, 289 decided
- Porch 82%, 130 decided
- Garage conversion 83%, 121 decided
- Basement 83%, 244 decided
- Window and door 79%, 225 decided