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

1. 9 Jun 2026

   Received by Gwynedd

2. 6 Aug 2026

   Added to PlanIndex

Gwynedd has decided this application; the outcome above is the register's own wording and the decision notice on the council portal carries the detail. More in our guide to what happens after a planning decision.

A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.

• CEFN CASTELL, Llanystumdwy, Criccieth, Gwynedd, LL52 0SA

  C25/0610/35/LL Submitted 27 Aug 2025 50 yards away

  Decision due ~22 Oct

  Gwaith sefydlogi clogwyn yn dilyn tirlithriad oherwydd dŵr o ddraen tir ac erydiad naturiol. Y gwaith i gynnwys rhagfur o greigiau a hoelio i’r pridd. Cliff stabilisation works following landslip due to water from land drain and natural erosion. Works to involve use of rock revetment and soil nailing.

  Status unknown Full applications

• Cefn Castell, Llanystumdwy, Criccieth, Gwynedd, LL52 0SA

  C25/0610/41/LL Submitted 27 Aug 2025 50 yards away

  Decision due ~22 Oct

  Gwaith sefydlogi clogwyn yn dilyn tirlithriad oherwydd dŵr o ddraen tir ac erydiad naturiol. Y gwaith i gynnwys rhagfur o greigiau a hoelio i’r pridd. Cliff stabilisation works following landslip due to water from land drain and natural erosion. Works to involve use of rock revetment and soil nailing.

  Status unknown Full applications

• Fferm Bron Eifion, Llanystumdwy, Gwynedd, LL52 0SA

  C25/0868/41/LL Submitted 27 Nov 2025 50 yards away

  Codi adeilad amaethyddol dros storfa silwair/buarth fferm presennol. Erection of an agricultural building over an existing silage store/farmyard

  Granted Full applications

• 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.

  Received 12 May, published by the council 6 Aug 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)

  Received 20 Apr, published by the council 6 Aug 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.

  Received 9 Apr, published by the council 6 Aug 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

  Received 1 Apr, published by the council 6 Aug 2026 Lawful development
• C26/0196/03/TC Status unknown

  7 Heol Glynllifon, Blaenau Ffestiniog, Gwynedd, LL41 3AF

  Tystysgrif Cyfreithlon Defnydd arfaethedig ar gyfer dymchwel estyniad cefn ac amnewid gyda estyniad un llawr. Certificate of Lawful Use for the proposed removal of rear extension to be replaced with single storey extension.

  Received 27 Mar, published by the council 6 Aug 2026 Lawful development