Loft conversion and dormer planning approval rate in Hertsmere
79% of 281 decided loft conversion and dormer applications in Hertsmere 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.
79%
Approval rate, all years, from 281 decided
281
decided loft conversion and dormer applications in Hertsmere: 223 approved, 58 refused
80%
Recent rate, decided since 2022, from 109 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 Withdrawn applications are excluded.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 loft conversion and dormer decisions in Hertsmere
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 |
|---|---|---|---|
| 25/1577/LBC | 2026 | Approved | Refurbishment works to include replacement of rear roof felt and main and rear roof tiles with original clay peg tiles, replacement timber casement window an... 15 London Road Shenley Radlett Hertfordshire WD7 9EW |
| 25/1804/HSE | 2026 | Approved | Enlargement of rear dormer windows into a single dormer with split design. 9 Kitswell Way Radlett Hertfordshire WD7 7HN |
| 26/0020/HSE | 2026 | Approved | Construction of a roof extension with a rear roof terrace, located within the footprint of the previously approved roof extension (ref. 17/2193/HSE), includi... 44 Manor Road Potters Bar Hertfordshire EN6 1DQ |
| 23/1762/FUL | 2025 | Refused | Construction of 4 x 3-bed residential dwellings with habitable loft accommodation to include associated parking, amenity, landscaping and cycle store. (Revis... Land Adjacent To 1 And 3 Thelusson Court Woodfield Road Radlett Hertfordshire WD7 8JF |
| 25/0340/MA | 2025 | Refused | Application for a non-material amendment to allow for increase in rear dormer size following the grant of planning permission ref 24/1144/HSE. 113 Melbourne Road Bushey Hertfordshire WD23 3ND |
| 25/1146/CLE | 2025 | Refused | Changes to approved roof extension to include dormer. Certificate of Lawful Development (Existing). 44 Manor Road Potters Bar Hertfordshire EN6 1DQ |
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 Hertsmere
- Single-storey rear extension 81%, 1,787 decided
- Two-storey rear extension 85%, 972 decided
- Wraparound extension 92%, 436 decided
- Side extension 84%, 702 decided
- Rooflight 90%, 918 decided
- Outbuilding and garden room 78%, 274 decided
- Porch 90%, 195 decided
- Garage conversion 96%, 294 decided
- Basement 84%, 136 decided
- Window and door 90%, 223 decided