--- title: "Siège Halden Ionics : validation RIBA étape 3, conception rév. C" description: "Examinez la conception coordonnée rév. C du siège de Halden Ionics : laboratoire en bois massif de 3 164 m², coût de 11,84 M£ et points à valider avant le 17 septembre." canonical: "https://pr-110.preview.formlio.com/fr/documents/oxford-validation-detape-de-conception" locale: "fr" type: "document" lastModified: "2026-11-08" alternates: en: "https://pr-110.preview.formlio.com/documents/oxford-design-stage-sign-off.md" --- # Siège Halden Ionics : validation RIBA étape 3, conception rév. C ## Stage 3 sign-off ### RIBA Stage 3 sign-off *Halden Ionics headquarters* - You approve: Spatial coordination, rev C - Sign by: Friday 17 September 2027 - It unlocks: Stage 4, from 27 September - Approver: Dr Anneke Rowsell, COO *Mass timber research building at dusk* *Threadgold Mwangi Architects mark* ## What you are approving *The decision* The coordinated design at revision C: a 3,164 m² mass timber headquarters and battery materials lab, at a construction cost of £11.84m. **If you sign by 17 September**, Stage 4 starts on 27 September, the planning application goes in on 1 October and the structural frame order can be placed in April 2028. **If you don't**, Stage 4 waits. Each week of delay moves the frame order by a week, and past 29 October we lose the contractor's early engagement slot and the 2028 site start with it. ## The design at rev C ### The design at revision C Views from the federated model as of 3 September. Open the live link in the project space to walk it before you sign. *Mass timber laboratory floor with service spines* *Timber stair in a four storey atrium* *Glulam column and steel connector detail* *Glazed facade modules with timber fins* *Roof with solar panels and plant enclosure* ## What changed ### What changed since rev B Measured against the review of 2 July. The second clean room caused the area and cost increases. The carbon fall comes from replacing the concrete core. ### GIA, up 64 m² **3,164 m²** ### Cost, up £186k **£11.84m** ### kgCO2e/m², down 38 **498** ### Open hard clashes **0** ## The one thing After this signature, moving a column costs a redesign of three packages. Moving a bench costs an afternoon. We've written down which is which. ## Fixed and movable ### What is fixed, and what can still move Stated per system. Changes to fixed items after signature go through the change procedure in our appointment, with a cost and date attached before any work starts. ### Fixed after signature Structural grid at 7.5 m by 9 m. Floor to floor at 4.2 m on lab levels and 3.6 m on office levels. Core and riser positions. Facade module at 1.5 m. Clean room location and its 450 mm raised floor. ### Movable until 14 January 2028 Lab bench layouts, fume cupboard positions within the service spines, equipment loads up to 5 kN/m², and room data sheets. After the freeze on 14 January these become change items. ### Movable until tender Finishes, loose furniture, signage, reception joinery and the planting scheme. None of these touches the coordinated model. ### Risks you carry with this approval Planning. We rate the application as supportable after two pre-application meetings, and no architect can promise consent. The determination period for a major application is 13 weeks. Stage 4 proceeds at risk during that period, and its fee is payable if consent is refused. ### Not part of this approval Consultant appointments stay with you: structural engineer, M&E consultant, quantity surveyor and principal designer under CDM 2015. Planning and building control fees are also yours. Our fee stays as appointed under the RIBA Standard Professional Services Contract. ## When you sign ### The two weeks after you sign Four actions in the two weeks after your signature. Nothing else needs you until the room data freeze. ### 1. Rev C locked, same day Joel Prenderby marks the model as the coordinated baseline and issues it to all consultants. ### 2. Consultants instructed, 20 September Structural engineer and M&E consultant receive their Stage 4 instructions, against the signed baseline. ### 3. Stage 4 kickoff, 27 September A weekly coordination meeting starts, with the clash report published every Friday in your project space. ### 4. Planning application, 1 October Design and Access Statement, drawings and the energy statement go in through the Planning Portal. ## Stage 4 programme ### Stage 4 and tender Twenty-seven weeks from signature to contractor's return. The 13-week planning determination runs in parallel and is the one date we can't control. | Task | Start | End | Duration | Label | | --- | --- | --- | --- | --- | | Planning submission | 2027-10-01 | 2027-10-02 | 5 days | Planning | | Determination, 13 weeks | 2027-10-04 | 2028-01-03 | 5 days | Planning | | Structural coordination | 2027-09-27 | 2027-11-19 | 5 days | Stage 4 | | Facade package | 2027-10-11 | 2027-12-17 | 5 days | Stage 4 | | M&E and clean room package | 2027-10-04 | 2028-01-21 | 5 days | Stage 4 | | Room data sheet freeze | 2028-01-14 | 2028-01-15 | 5 days | Stage 4 | | Tender package issued | 2028-01-31 | 2028-02-01 | 5 days | Tender | | Two-stage JCT tender | 2028-02-01 | 2028-03-24 | 5 days | Tender | ## Sign-off ### Signature by Friday 17 September If anything in revision C is wrong, tell Joel before you sign. A correction this week costs hours. The same correction in December costs a package reissue. ### Prepared by **Wanjiru Mwangi** Director, Threadgold Mwangi Architects 12 Osney Mead Yard Oxford OX2 0ES wanjiru@threadgoldmwangi.co.uk ### For approval by **Dr Anneke Rowsell** Chief Operating Officer, Halden Ionics Project architect: Joel Prenderby joel@threadgoldmwangi.co.uk ### Sign off RIBA Stage 3 By signing, you approve the Stage 3 design at revision C: 3,164 m² GIA and a construction cost of £11.84m excluding VAT. You also instruct Stage 4 from Monday 27 September 2027 and the planning submission on 1 October 2027.