Side extension planning approval rate in Cornwall
98% of 57 decided side extension applications in Cornwall 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.
98%
Approval rate, all years, from 57 decided
57
decided side extension applications in Cornwall: 56 approved, 1 refused
95%
Recent rate, decided since 2022, from 22 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 Withdrawn applications are excluded.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 side extension decisions in Cornwall
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 |
|---|---|---|---|
| PA24/08799 | 2025 | Approved | Proposed single storey side extension Berry Cottage Deviock Torpoint Cornwall PL11 3HB |
| PA25/01951 | 2025 | Approved | Proposed Single storey side extension to 1 Bownder Vean. They require the property to have more space for their children and to have space for the applicant... 1 Bownder Vean St Austell Cornwall PL25 3DB |
| PA25/01980 | 2025 | Approved | Replacement of a single storey rear extension with new single storey rear extension and construction of single storey side extension Moonwind Atlantic Close Treknow Tintagel Cornwall PL34 0EL |
| PA25/01990 | 2025 | Approved | A single storey side extension to the existing modern detached dwelling. 1 Adeston Road Padstow Cornwall PL28 8GD |
| PA25/03358 | 2025 | Approved | Proposed demolition of the existing conservatory, single-storey side extension and outbuilding, to enable the construction of a one and a half storey side ex... Trevorrick Cottage St Merryn Padstow Cornwall PL28 8PP |
| PA23/08697 | 2024 | Refused | Certificate of lawfulness for the proposed development of a proposed side extension to be used as additional living space. Old Meadow Dobbin Lane Trevone Padstow Cornwall PL28 8QP |
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 Cornwall
- Single-storey rear extension 97%, 146 decided
- Two-storey rear extension 98%, 45 decided
- Wraparound extension 100%, 9 decided
- Loft conversion and dormer 97%, 97 decided
- Rooflight 98%, 52 decided
- Outbuilding and garden room 95%, 125 decided
- Porch 100%, 63 decided
- Garage conversion 94%, 47 decided
- Basement 100%, 11 decided
- Window and door 96%, 187 decided