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

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

  FPL/2020/264 Submitted 21 Dec 2020 150 yards away

  Cais llawn ar gyfer codi 8 uned busnes (Dosbarth B1, B2 a B8) adeiladu ardaloedd tirlunio medal a chaled ynghyd â gwaith cysylltiedig ar dir yn / Full application for the erection of 8 business units (Class B1, B2 and B8), construction of soft and hard landscaping together with associated works on land at

  Withdrawn Full applications 19 docs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

• Morrisons,Caergybi/ Holyhead

  FPL/2020/152 Submitted 25 Aug 2020 200 yards away

  Cais llawn i am canopi newydd a'r gyfer parcio car yn y iard wasanaeth yn/ Full application for a new vehicle parking canopy within existing service yard at

  Granted Full applications 7 docs

• FPL/2025/297 Withdrawn

  Bryn Gwyn, Brynrefail, Dulas

  Cais llawn ar gyfer dymchwel yr annedd a garej bresennol, codi annedd a garej newydd yn ei le a gwaith cysylltiedig yn / Full application for the demolition of the existing dwelling and garage, the erection of a replacement dwelling and garage and associated works at

  Received 28 Nov, published by the council 6 Aug 2026 Full applications
• FPL/2025/295 Granted

  58 Stryd y Glorian / Machine Street, Amlwch.

  Cais llawn ar gyfer codi garej newydd ar dir ger / Full application for the erection of a new garage on land adjacent to

  Received 28 Nov, published by the council 6 Aug 2026 Full applications
• FPL/2026/45 Granted

  Rallt, Nebo.

  Cais llawn i godi bloc stabl ar dir ger / Full application for the erection of a stable block on land near

  Received 3 Mar, published by the council 6 Aug 2026 Full applications
• 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