Holyhead Waste Water Treatment Works

1. 22 May 2025

   Received by Isle of Anglesey

2. 8 Jul 2025

   Validated

   Checked as complete and ready for consideration.

3. 8 Dec 2025

   Decision issued: Caniatáu / Permit

4. 16 Sep 2026

   Added to PlanIndex

Isle of Anglesey granted permission on 8 December 2025, subject to any conditions on the decision notice. Work must normally begin within five years or the permission lapses. More in our guide to what happens after a planning decision.

A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.

• Gwaith Trin Carfosaeth/Sewage Treatment Works, Caergybi/Holyhead

  SCR/2021/42 Submitted 10 Jun 2021 50 yards away

  Barn sgrinio ar gyfer codi un twrbin wynt 90kw gyda uchder hwb hyd at uchafswm o 23m, diamedr rotor hyd at uchafswm o 26m a uchder blaen unionsyth hyd at uchafswm o 36m ynghyd a datblygiadau cysylltiedig ar dir yn / Screening opinion for the erection of one 90kw wind turbine with a maximum hub height of up to 23m, rotor diameter of up to 26m and a maximum upright vertical tip height of up to 36m together with associated development on land at

  Decided Outline 2 docs

• Former Heliport Site, Stad Diwydiannol Penrhos / Penrhos Industrial Estate, Penrhos, Caergybi / Holyhead

  FPL/2022/43 Submitted 15 Feb 2022 100 yards away

  Cais llawn ar gyfer codi 6 uned busnes ynghyd a tirlunio a datblygiadau cysylltiedig yn / Full application for the erection of 6 business units together with landscaping and associated development at

  Granted Full applications 22 docs

• Stad Diwydiannol Penrhos Industrial Estate, Caergybi/Holyhead

  D56/2021/6 Submitted 30 Aug 2021 150 yards away

  Caisllawn ar gyfer codi twr latis 22.5m ar dir yn /Full application for the erection of a 22.5m lattice tower on land at

  Granted Full applications 17 docs

• Former Heliport Site, Stad Diwydiannol Penrhos Industrial Estate, Penrhos, Caergybi/Holyhead

  FPL/2021/178 Submitted 16 Jul 2021 150 yards away

  Cais llawn ar gyfer codi 7 uned busnes ynghyd a tirlunio a datblygiadau cysylltiedig yn / Full application for the erection of 7 business units together with landscaping and associated development at

  Granted Full applications 25 docs

• Morrison Supermarkets Ltd, Penrhos, Caergybi / Holyhead.

  FPL/2026/27 Submitted 10 Feb 2026 200 yards away

  Cais llawn i ddymchwel y canopi presennol a'r strwythur cysylltiedig a chodi canopi newydd yn / Full application for the demolition af the existing glazed entrance canopy and associated structure and erection of a replacement canopy at

  Granted Full applications Demolition Windows or glazing 8 docs

• Morrisons, Ystad Ddiwydiannol Penrhos Industrial Estate, Caergybi / Holyhead.

  FPL/2026/54 Submitted 16 Mar 2026 200 yards away

  Cais llawn ar gyfer creu parth gwefru cerbydau trydan, ynghyd â gwaith cysylltiedig yn / Full application for the creation of an EV charging zone, together with associated works at

  Decided Full applications 18 docs

• FPL/2025/311 Granted

  Tai Lewis Rogers, Ffordd Penmynydd, Penmynydd

  Cais llawn ar gyfer trosi'r 5 eiddo preswyl presennol yn 3, yn ogystal ag addasu ac ehangu, creu mynedfa newydd, gosod pecyn trin carthion a phaneli solar ar y ddaear yn / Full application for the conversion of the 5 existing residential properties into 3, together with alterations and extensions, creation of a new access, installation of a treatment plant and ground mounted solar panels at

  Received 12 Dec, published by the council 6 Aug 2026 Full applications
• FPL/2026/33 Granted

  M-SParc, Gaerwen

  Cais llawn ar gyfer gosod paneli solar PV ar y ddaear, ynghyd ag offer cysylltiedig ar dir yn / Full application for the installation of ground mounted PV solar panels, together with associated equipment on land at

  Received 13 Feb, published by the council 6 Aug 2026 Full applications
• FPL/2025/320 Granted

  Ffrwd Onnen, Llangristiolus, Bodorgan

  Cais llawn ar gyfer creu menage a codi stabl yn / Full application for the creation of a menage and the erection of a stable at

  Received 22 Dec, published by the council 6 Aug 2026 Full applications
• FPL/2026/85 Granted

  31 & 32 Tyddyn To, Porthaethwy / Menai Bridge

  Cais llawn ar gyfer newid defnydd dau uned fanwerthu ar y llawr gwaelod (Dosbarth Defnydd A1) i ddau uned breswyl fforddiadwy (Dosbarth Defnydd C3) ynghyd ag addasiadau allanol yn / Full application for the change of use of two ground floor retail units (Use Class A1) into two affordable residential units (Use Class C3) together with external alterations at

  Received 17 Apr, published by the council 6 Aug 2026 Full applications
• FPL/2026/69 Granted

  Parc Gwledig Morglawdd, Caergybi / Breakwater Country Park, Holyhead

  Cais llawn ar gyfer lleoli arsyllfa seryrol ac adeilad addysgol yn ogystal â datblygiad cysylltiedig yn / Full application for the siting of an astronomical observatory and education building together with associated development at

  Received 31 Mar, published by the council 6 Aug 2026 Full applications