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Planning agent

Design Extension

A design practice registered in Purley. 121 planning applications on PlanIndex across 23 councils . On the register from 2019 to 2026.

80 granted and 26 refused of 106 decided applications in our index. A record of decisions already made, not a forecast of the next one.

Where they work

  1. Sutton27
  2. Westminster13
  3. Lewisham12
  4. Croydon10
  5. Lambeth9
  6. Greenwich6
  7. Southwark5
  8. Brent5
  9. Ealing5
  10. Old Oak and Park Royal Development Corporation5
  11. Newham3
  12. Bromley3

And 11 other councils.

What they file

  1. Householder41%
  2. Full applications31%
  3. Heritage and listed buildings8%
  4. Lawful development8%
  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

  • 26/01845/HH Awaiting decision

    8 Torrens Road Stratford London E15 4NA

    Erection of single storey ground floor rear extension.

    Householder
  • 26/01846/CLP Awaiting decision

    8 Torrens Road Stratford London E15 4NA

    Application for a lawful development certificate (proposed) for the erection of a loft conversion and a rear dormer with a juliet balcony and installation of 3x front rooflights.

    Lawful development
  • P/20819/003 Status unknown

    48, Park Lane, Slough, SL3 7PF

    Construction of a side dormer window

    Submitted 19 Aug 2026 Full applications
  • 26/02254/FUL Awaiting decision

    18 Ashmill Court 13 Beulah Grove Croydon CR0 2QU

    Construction of a dormer extension in the rear roof slope and installation of two roof lights within the front roof slope.

    Submitted 10 Aug 2026 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

111 more applications on record

Trade members see everything this firm has filed, filter it by council and outcome, and get an email the day it files again.

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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.