Hotel Port Dinorwic, PLAS DINORWIC Ffordd Siabod, Y Felinheli, Gwynedd, LL56 4XA

1. 18 Aug 2025

   Received by Gwynedd

2. 6 Aug 2026

   Added to PlanIndex

The council refused this application for the reasons set out on the decision notice, which the council portal holds in full. Only the applicant can appeal a refusal; the time limit runs from the decision date and is shorter for householder schemes.

Refusal does not prevent a fresh attempt. Applicants often address the reasons for refusal and resubmit, so a refused scheme is not necessarily the end of proposals for the site.

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

• Rear Of Porth Y Llechen, Y Felinheli, LL56 4JG

  C25/0627/20/CC Submitted 8 Sep 2025 130m away

  Decision due ~3 Nov

  Gwaith i goed sy'n destun Gorchymyn Diogelu Coed. Work to trees protected by a Tree Preservation Order.

  Status unknown Trees

• Land To The Front Of Yr Heulyn, Hen Gei Llechi, Felinheli, LL56 4JN

  C26/0195/20/LL Submitted 27 Mar 2026 132m away

  Decision due ~22 May

  Codi deildy arfaethedig i greu ardal eistedd dan do dros yr ardal eistedd / adloniant bresennol Proposed erection of pergola to create covered sitting area over existing seating / entertainment area

  Status unknown Full applications

• 29 Hen Gei Llechi, Y Felinheli, Gwynedd, LL56 4PB

  C26/0100/20/DT Submitted 12 Feb 2026 410m away

  Gosod Pwmp Gwres Vaillant ar wal ochr yr annedd. Installation of a Vaillant Heat Pump on the side wall of the dwelling.

  Decided Householder
  Domestic

• C26/0348/41/TC Decided

  Ynys Gain Bach, YNYS GAIN, Llanystumdwy, Criccieth, Gwynedd, LL52 0SA

  Cais am Dystysgrif Datblygiad Cyfreithlon ar gyfer defnydd llety gwyliau tymor byr (C6) / Application for a Certificate of Lawful Development for use as short-term lets (C6)

  9 Jun 2026 Lawful development
• C26/0295/20/TC Status unknown

  CROESOR Tan Y Maes, Y Felinheli, Gwynedd, LL56 4UQ

  Lleoli catref symudol at defnydd ategol i'r prif dy annedd. Siting of a mobile home for ancillary use to the main dwellinghouse.

  12 May 2026 Lawful development
• C26/0250/09/TC Status unknown

  OLD BAKERY COTTAGE High Street, Tywyn, Gwynedd, LL36 9AE

  Cais am Dystysgrif Datblygiad Cyfreithlon ar gyfer Defnydd presennol cyn Fecws yn dy annedd (Dosbarth Defnydd C3) Application for a Lawful Development Certificate for the existing use of a former Bakery as a dwelling house (C3 Use Class)

  20 Apr 2026 Lawful development
• C26/0229/17/TC Status unknown

  FFERM FRON DIRION GANOL, Cilgwyn, Caernarfon, Gwynedd, LL54 7SE

  Tystysgrif Datblygiad Cyfreithlon ar gyfer gosod tyrbin gwynt arunig o fewn cwrtil tŷ annedd. Lawful Development Certificate for the proposed installation of a stand alone wind turbine within the curtilage of a dwellinghouse.

  9 Apr 2026 Lawful development
• C26/0211/25/TC Status unknown

  Nyth Bach, Tyddyn Hir, Caerhun, Bangor, Gwynedd, LL57 4DU

  Cais am Dystysgrif Datblygiad Cyfreithlon ar gyfer defnydd anecs Nyth Bach, Caerhun, Bangor, LL57 4DU fel uned preswyl ar wahân (C3) am gyfnod parhaus a di-dor o 10 mlynedd, yn groes I gofynion amod 2 o ganiatâd Cynllunio C10A/0112/25/LL Application for a Lawful Development Certificate for the use of the annex known as Nyth Bach, Caerhun, Bangor, LL57 4DU as a separate residential unit (C3) for a continuous and uninterrupted period of 10 years, contrary to the requirements of condition 2 of planning permission C10A/0112/25/LL

  1 Apr 2026 Lawful development