20 Crystal Avenue Heath Cardiff CF23 5QL

1. 6 Feb 2023

   Received by Cardiff

2. 10 Feb 2023

   Validated

   Checked as complete and ready for consideration.

3. 3 Apr 2023

   Decision issued: Permission Granted

4. 4 Sep 2026

   Added to PlanIndex

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 five 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.

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.

More on lawful development applications in our guide

• 39 Crystal Avenue Heath Cardiff CF23 5QL

  25/02979/CLPUD Submitted 19 Dec 2025 54m away

  Single storey rear and side extension.

  Granted Lawful development Extension 5 docs
  Small domestic

• 10 Heath Halt Road Cyncoed Cardiff CF23 5QF

  26/00396/HSE Submitted 25 Feb 2026 87m away

  Demolition of garage/outbuilding and construction of a habitable non self-contained annex.

  Granted Householder Demolition 6 docs
  Small domestic

• 116 Heath Park Avenue Heath Cardiff CF14 3RJ

  26/01677/HSE Submitted 6 Aug 2026 135m away

  92% historically approved · decision due ~1 Oct

  Construction of an orangery to the rear elevation.

  Awaiting decision Householder Extension 5 docs
  Domestic

• 115 Heath Park Avenue Heath Cardiff CF14 3RG

  24/01791/HSE Submitted 1 Aug 2024 153m away

  Hip to gable roof extension and rear dormer loft conversion.

  Granted Householder Extension Loft or dormer 6 docs
  Domestic

• 38 Lake Road North Cyncoed Cardiff CF23 5QN

  22/02779/HSE Submitted 21 Nov 2022 174m away

  Rear dormer roof extension involving a hip to gable roof extension and single storey rear extension

  Granted Householder Extension Loft or dormer 12 docs
  Small domestic

• 56 Heath Halt Road Cyncoed Cardiff CF23 5QF

  23/00371/HSE Submitted 16 Feb 2023 178m away

  Rear apex dormer roof extension and associated works

  Granted Householder Extension Loft or dormer 11 docs
  Domestic

• 26/01705/CLPUD Granted

  390 Cyncoed Road Cyncoed Cardiff CF23 6SA

  Use of 390 Cyncoed Road as residential accommodation for up to six adults with mental health conditions, living together as a single household, with care and support provided by non-resident staff

  11 Aug 2026 Lawful development
• 26/01807/CLPUD Awaiting decision

  33 Blossom Drive Lisvane Cardiff CF14 0BE

  Proposed single storey rear extension and conversion of integral garage

  25 Aug 2026 Lawful development
• 26/01476/CLPUD Granted

  71 Llandennis Avenue Cyncoed Cardiff CF23 6JF

  Single storey extension to side and rear.

  16 Jul 2026 Lawful development
• 26/01662/CLEUD Granted

  2 Llantwit Street Cathays Cardiff CF24 4AJ

  Use of the property as four self-contained flats.

  5 Aug 2026 Lawful development
• 26/01775/CLEUD Awaiting decision

  62 Cottrell Road Roath Cardiff CF24 3EZ

  Use of the property as 2 residential care flats (Class C2).

  20 Aug 2026 Lawful development