Single-storey rear extension planning approval rate in Harrow
74% of 1,909 decided single-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 1,909 decided
1,909
decided single-storey rear extension applications in Harrow: 1,421 approved, 488 refused
69%
Recent rate, decided since 2022, from 1,391 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 Withdrawn applications are excluded. The eight-record threshold is a display rule, not a guarantee that a sample is statistically reliable.
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.
Coverage for this project type
Dated records in this archive span 1998 to 2025. 1 of 1,909 decided records have no year recorded. Coverage may have gaps within the date range.
1,391 decided records are dated 2022 or later. This is an archive count, not a measure of all current council activity.
These project categories can include different application routes and proposals combining several kinds of work. Read the proposal and decision type before comparing it with your project.
Check planning requirements in Harrow, or read about permitted development in Harrow. An approval rate does not decide which route your property qualifies for.
Example single-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.
Search Harrow's planning register using the references below. Descriptions may be shortened; read the complete proposal and decision notice.
| Reference | Year | Decision | Application |
|---|---|---|---|
| PL/0165/25 | 2025 | Refused | Single storey rear extension, Alterations to roof to form covered hall at rear, External alterations (Demolition of summer house) |
| PL/0440/25 | 2025 | Approved | Detached single storey outbuilding at rear for use as Gym/Office |
| PL/0507/25 | 2025 | Approved | Single storey rear extension (Demolition of rear extension) |
| PL/0538/25 | 2025 | Approved | Detached single storey outbuilding at rear for use as swimming pool with solar panels on roof, Detached single storey outbuilding at rear for use as storage,... |
| PL/0569/25 | 2025 | Refused | Certificate of lawful development (proposed): Front porch; single storey outbuilding in rear garden |
| PL/0648/25 | 2025 | Refused | Single storey rear extension, Landscaping and steps to rear, External alterations |
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
- Two-storey rear extension 74%, 1,110 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