Single-storey rear extension planning approval rate in Cornwall
97% of 146 decided single-storey rear 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.
97%
Approval rate, all years, from 146 decided
146
decided single-storey rear extension applications in Cornwall: 142 approved, 4 refused
96%
Recent rate, decided since 2022, from 54 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 Withdrawn applications are excluded.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 2015 to 2026. 0 of 146 decided records have no year recorded. Coverage may have gaps within the date range.
54 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 Cornwall, or read about permitted development in Cornwall. An approval rate does not decide which route your property qualifies for.
Example single-storey rear 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.
Visit Cornwall's official website to find its planning register and search the references below. Descriptions may be shortened.
| Reference | Year | Decision | Application |
|---|---|---|---|
| PA25/07958 | 2026 | Approved | Single storey extension to rear of bungalow 18 Penhalls Way Playing Place Truro Cornwall TR3 6EX |
| PA25/07964 | 2026 | Approved | Alterations to the front facade including the replacement of the existing porch, installation of juliet balconies at first and second floor levels, projectin... The Edgecumbe Hotel 19 Summerleaze Crescent Bude Cornwall EX23 8HJ |
| PA24/08738 | 2025 | Approved | Full-width rear extension to existing two-bedroom bungalow, extending the kitchen by 2.3m and the living area by 8m with internal rearrangements. 1 Southdown Close Sticker St Austell Cornwall PL26 7EP |
| PA24/07415 | 2024 | Refused | Single Storey Rear Extension Trevelo Farm Three Burrows Blackwater Truro Cornwall TR4 8HX |
| PA23/02970 | 2023 | Refused | Rear extension, loft conversion including raising of ridge height and insertion of rooflights and gable end windows, conversion of garage into annexed accomm... Steeple Lodge Steeple Lane St Ives Cornwall TR26 2AY |
| PA19/09527 | 2020 | Refused | Application, part retrospective, to replace existing rotten pitched roof over rear extension with flat amenity area; create platform at first floor level wit... 41 Cliff Street Mevagissey St Austell Cornwall PL26 6QJ |
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
- Two-storey rear extension 98%, 45 decided
- Wraparound extension 100%, 9 decided
- Side extension 98%, 57 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