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Planning application

20/1711/CLPD

Pimlico House Hyde Lane Nash Mills HP3 8SA

Granted Three Rivers Certificate of Lawfulness - Proposed Use

Proposal

Certificate of Lawfulness Proposed Development: Construction of outbuilding with solar panels to roof

As published by the council, reference 20/1711/CLPD

Timeline

Dates from the published record

  1. 19 Aug 2020

    Received by Three Rivers

  2. 24 Aug 2020

    Validated

    Checked as complete and ready for consideration.

  3. 19 Oct 2020

    Decision issued: approved

  4. 26 Jul 2026

    Added to PlanIndex

What 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.

More on lawful development applications in our guide

Nearby applications

Within 500 metres

  • 22/0375/FUL Granted

    Pimlico House Hyde Lane Nash Mills Hertfordshire HP3 8SA

    Part single, part two storey side extensions, single storey rear extension and connection of outbuilding to main dwelling, loft conversion including extension to roof, increase in ridge height and installation of front and rear dormers and construction of raised terraces (amendments to planning permission 20/0589/FUL)

    3 Mar 2022 9m away Full applications
  • 26/0460/CLED Awaiting decision

    Annexe Hart Hall Hyde Lane Nash Mills Hemel Hempstead Hertfordshire HP3 8SA

    Certificate of Lawfulness Existing Use: Use of annexe as an independent dwelling

    19 Mar 2026 375m away Lawful development

In Three Rivers

  • 26/0842/CLPD Granted

    Dykewood Chorleywood Road Rickmansworth Hertfordshire WD3 4ES

    Certificate of Lawfulness Proposed Development: Installation of solar panels.

    26 May 2026 Lawful development
  • 26/0952/CLPD Granted

    54 Station Road Kings Langley Hertfordshire WD4 8LB

    Certificate of Lawfulness Proposed Development: Loft conversion including hip to gable roof extension; rear dormer, velux windows and construction of outbuilding to rear.

    11 Jun 2026 Lawful development
  • 26/1165/CLPD Awaiting decision

    30 Gable Close Abbots Langley Hertfordshire WD5 0LD

    Certificate of Lawfulness Proposed Development: Loft conversion including rear dormer window and front rooflights

    20 Jul 2026 Lawful development
  • 26/0724/CLED Granted

    70 The Mead Carpenders Park Watford Hertfordshire WD19 5BU

    Certificate of Lawfulness Existing Use: Use of annexe as a separate dwelling

    5 May 2026 Lawful development
  • 25/1151/CLED Refused

    Unit 6 Century Court Tolpits Lane Watford Hertfordshire

    Certificate of Lawfulness Existing Use: Use of property as single dwellinghouse (Use Class C3)

    4 Jul 2025 Lawful development