Side extension planning approval rate in Harrow
72% of 499 decided side 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.
72%
Approval rate, all years, from 499 decided
499
decided side extension applications in Harrow: 357 approved, 142 refused
66%
Recent rate, decided since 2022, from 341 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 Withdrawn applications are excluded.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 2000 to 2025. 0 of 499 decided records have no year recorded. Coverage may have gaps within the date range.
341 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 side 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/0130/25 | 2025 | Approved | Front porch, Single story side extension, Alterations to roof of side extension to raise height, Single storey rear extension (revised description) |
| PL/0303/25 | 2025 | Refused | Erection of a single storey side extension, conversion of garage into habitable space and erection of a single storey rear extension |
| PL/0449/25 | 2025 | Refused | Single storey front to side extension; single storey side to rear extension at No.72; single storey side to rear extension at No. 74; conversion of two singl... |
| PL/0536/25 | 2025 | Approved | First floor side extension, Alterations to roof to create hipped roof and reduced rear dormer, Replacement roof light in front roof slope, External alterations |
| PL/0640/25 | 2025 | Refused | Conversion of garage into habitable room and replacement of garage door with window; single storey infill extension to link converted garage to main dwelling... |
| PL/0752/25 | 2025 | Approved | Relocation of entrance to front elevation, Conversion of garage to habitable room, Replace garage door with window in front elevation, Single Storey side ext... |
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
- Two-storey rear extension 74%, 1,110 decided
- Wraparound extension 87%, 119 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