Planning application
137 Petersfield Avenue Staines-upon-Thames TW18 1DH
Works: Extension Loft or dormer
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Certificate of Lawfulness for the proposed loft conversion facilitated by a hip to gable extension and rear dormer. Erection of outbuilding in rear garden.
As published by the council, reference 26/00426/CPD
Application record
- Reference
- 26/00426/CPD
- Type
- Cert. of Lawful Proposed Use and Dev
- Status
- Decided
- Decision
- Grant Cert Lawful Prop Use/Dev
- Received
- 27 Apr 2026
- Validated
- 29 Apr 2026
- Decided
- 9 Jun 2026
- Ward
- Staines South
- Parish
- Staines South And Ashford West ED
- Decision by
- Delegated Decision
- Postcode
- TW18 1DH
Timeline
Dates from the published record
-
27 Apr 2026
Received by Spelthorne
-
29 Apr 2026
Validated
Checked as complete and ready for consideration.
-
9 Jun 2026
Decision issued: Grant Cert Lawful Prop Use/Dev
-
11 Aug 2026
Added to PlanIndex
Who's behind it
Company information only, from the register and Companies House
Agent on file, an architecture practice registered in London
40 applications on PlanIndex · across 10 councils · 71% granted
Trade members see who it is, their full track record, and every application they have filed.
See who's behind itDocuments
Plans, drawings, consultee responses and the officer's report
9 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
Trade members open them from here.
Open the documentsWhat a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
About lawful development applications
How this application type works
A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.
Nearby applications
Within 500 metres
-
137 Petersfield Avenue Staines-upon-Thames TW18 1DH
Erection of a single storey rear extension with terrace. Single storey front porch extension. External insulation and re-rendering house, and changes to fenestration. Following removal of existing garage.
Granted Householder Extension Windows or glazing 8 docsSmall domestic -
Junction Opposite Edinburgh Drive And Kingston Road Staines-upon-Thames TW18 1PA
86% historically approved · decision due ~29 Jul
Prior Approval notification for the upgrade of the existing telecommunications site. Removal of the existing 8m telegraph pole and antennas, and installation of a 20m monopole supporting 6 no new antennas with wraparound cabinet at base with the removal of 2 no existing cabinets and replacement with 1 no new cabinet and ancillary development
Decided 30 docs -
102 Petersfield Road Staines-upon-Thames TW18 1DL
86% historically approved · decision due ~31 Oct
Discharge of condition 6 (Materials) and 10 (Renewable Energy) relating to planning permission 24/00657/FUL
Awaiting decision Conditions 2 docs -
102 Petersfield Road Staines-upon-Thames TW18 1DL
Discharge of condition 6 (Materials) and 10 (Renewable Energy) relating to planning permission 24/00657/FUL
Decided Conditions 5 docs -
202 Kingston Road Staines-upon-Thames TW18 1PE
Variation to Condition 3 (Approved Plans) relating to planning permission 25/00626/HOU for the erection of an outbuilding with solar panels in the rear garden. Rescaling and repositioning of structure, changes to fenestration, and greater overhang of eaves.
Granted Amendments Windows or glazing 6 docs -
153 Kingston Road Staines-upon-Thames TW18 1PB
86% historically approved · decision due ~17 Aug
Certificate of Lawfulness for proposed loft conversion with a hip to gable roof alteration and a rear dormer
Awaiting decision Loft or dormer 10 docs
Other lawful development applications
In Spelthorne
-
26/00452/CLD Granted
177A Feltham Road Ashford TW15 1BB
Certificate of Lawfulness for existing use of the ground floor flat as a small HMO (Use Class C4)
-
26/00200/CLD Granted
73 Nursery Gardens Staines-upon-Thames TW18 1EL
Certificate of Lawfulness to establish the lawful use of the property is as a House in Multiple Occupation (Use Class C4) for up to six occupants. As shown on site location plan and block plan no EX-1003 and Pre-Existing Floor Plans (Page 01 of 02) and Existing Floor Plans (Page 02 of 02) received 27.02.2026.
-
26/00383/CPD Refused
13 Meadow Road Ashford TW15 1PL
Certificate of lawfulness for proposed change of use from a 6 Person HMO (Class C4) to a 7 Person HMO (Sui-Generis)
-
26/00437/CLD Refused
4 Sunmead Road Sunbury-on-Thames TW16 6PE
Certificate of Existing Lawfulness for the conversion of a C3 dwellinghouse to a C4 small 6-person HMO.
-
26/00575/CLD Refused
96 Groveley Road Sunbury-on-Thames TW16 7LB
Certificate of Lawfulness for an existing development and use for a ground floor rear extension, roof alterations including a rear roof dormer and a hip to gable conversion with insertion of rooflights, and use as a small HMO (use class C4)