Loft conversion and dormer planning approval rate in Portsmouth
36% of 201 decided loft conversion and dormer applications in Portsmouth 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.
36%
Approval rate, all years, from 201 decided
201
decided loft conversion and dormer applications in Portsmouth: 72 approved, 129 refused
41%
Recent rate, decided since 2022, from 82 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 Withdrawn applications are excluded.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 Portsmouth
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 |
|---|---|---|---|
| 24/00372/FUL | 2026 | Refused | Conversion to form 2 flats; external alterations to the raising the roof height of the building, construction of a dormer to rear roofslope and demolition/re... 114 Waverley Road Southsea PO5 2PS |
| 25/01418/CPL | 2026 | Approved | Application for Certificate of Lawful Development for the proposed alterations to roof to include hip to gable buildup and construction of dormer windows to... 44 First Avenue Portsmouth PO6 1JN |
| 24/01024/LBC | 2025 | Approved | Alterations to include enlargement of existing rear dormer, finished in slates to match existing & new felt roof and railings to existing front boundary wall 1 Clifton Terrace Southsea PO5 3NL |
| 24/01303/HOU | 2025 | Refused | Construction of front dormer 20 Shelley Avenue Portsmouth PO6 4PN |
| 24/01496/NMA | 2025 | Refused | Application for non material amendment to planning permission 21/00484/HOU to add dormer to west roofslope 22 Central Road Portsmouth PO6 1QF |
| 25/00489/LBC | 2025 | Approved | External alterations including extension at third floor level and construction of additional floor level with new mansard roof to create a penthouse apartmen... 29B South Parade Southsea PO4 0SH |
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 Portsmouth
- Single-storey rear extension 55%, 420 decided
- Two-storey rear extension 20%, 91 decided
- Wraparound extension 19%, 31 decided
- Side extension 34%, 79 decided
- Rooflight 78%, 81 decided
- Outbuilding and garden room 59%, 34 decided
- Porch 75%, 32 decided
- Garage conversion 56%, 9 decided
- Basement 64%, 44 decided
- Window and door 77%, 232 decided