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Planning agent

Design Extension

A design practice registered in Purley. 133 planning applications on PlanIndex across 24 councils . On the register from 2018 to 2026.

91 granted and 30 refused of 121 decided applications in our index. A record of decisions already made, not a forecast of the next one.

Where they work

  1. Sutton30

    90% approved here, against 87% for the council

  2. Croydon15

    60% approved here, against 87% for the council

  3. Lewisham13

    44% approved here, against 87% for the council

  4. Westminster13

    73% approved here, against 89% for the council

  5. Lambeth10

    75% approved here, against 83% for the council

  6. Southwark6

    100% approved here, against 95% for the council

  7. Brent6

    83% approved here, against 78% for the council

  8. Greenwich6

    40% approved here, against 85% for the council

  9. Ealing5

    80% approved here, against 86% for the council

  10. Old Oak and Park Royal Development Corporation5

    80% approved here, against 87% for the council

  11. Epsom and Ewell4
  12. Bromley3

And 12 other councils.

What they file

  1. Householder42%
  2. Full applications31%
  3. Heritage and listed buildings8%
  4. Lawful development7%
  5. Outline6%

Company record

From Companies House. Company information only; we never show personal contact details.

Registered name
DESIGN EXTENSION LTD
Company number
16557274
Status
Active
Incorporated
2 July 2025
Registered in
Purley

Track record

The 10 most recent applications naming this firm

  • 26/01030/FUL Awaiting decision

    167A Chessington Road West Ewell Surrey KT19 9XE

    First floor rear extension and roof extension to accommodate a habitable space incorporating a rear dormer and front roof light .

    Full applications
  • DC/26/144743 Awaiting decision

    SECOND FLOOR FLAT, 37B DEVONSHIRE ROAD, LONDON, SE23 3EN

    Replacement of existing window units with timber framed units at the Second Floor Flat, 37B Devonshire Road SE23.

    Submitted 14 Jul 2026 Full applications
  • DM2026/00660 Granted

    148 St Dunstans Hill Cheam SM1 2TU

    Erection of a single storey rear extension.

    Decided 21 Jul 2026 Householder
  • PA/26/00871/NC Granted

    102 Old Ford Road, London, E2 9PW

    Replacement of three sash window units (W1, W2, W3); sash boxes retained; 14mm slimline double glazing, integral gazing bar and dark grey paint finish

    Decided 14 Aug 2026 Heritage and listed buildings
  • PA/26/00870/NC Granted

    102 Old Ford Road, London, E2 9PW

    Replacement of three sash window units (W1, W2, W3); sash boxes retained; 14mm slimline double glazing, integral gazing bar and dark grey paint finish

    Decided 14 Aug 2026 Full applications
  • DM2026/00634 Granted

    12 Claydon Drive Beddington CR0 4QX

    Erection of a part one, part two storey rear extension.

    Decided 16 Jul 2026 Householder
  • 262047FUL Granted

    138 Dormers Wells Lane Southall UB1 3JB

    Conversion of a single dwellinghouse into two self-contained dwellings; first floor rear extension; and provision of associated amenity space, refuse and cycle storage

    Decided 9 Jul 2026
  • 262047FUL Granted

    138 Dormers Wells Lane Southall UB1 3JB

    Conversion of a single dwellinghouse into two self-contained dwellings; first floor rear extension; and provision of associated amenity space, refuse and cycle storage

    Decided 9 Jul 2026 Full applications
  • 26/1171 Granted

    37 Mortimer Road, London, NW10 5QR

    Certificate of lawfulness for proposed single storey outbuilding in rear garden of dwellinghouse.

    Decided 29 Jun 2026 Lawful development
  • 26/1170 Granted

    37 Mortimer Road, London, NW10 5QR

    Proposed demolition of existing rear dormer, erection of single storey side to rear wraparound extension, rear dormer extension to main roof and rear outrigger and replacement of 1x first floor rear window to the dwellinghouse.

    Decided 8 Jul 2026 Householder

123 more applications on record

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From council registers and Companies House. Counts describe the records we hold, not a firm's complete history. Request a correction or removal.