Building safety remediation needs package discipline

When a housebuilder’s building safety provision keeps climbing, the commercial problem is not the headline number. It is portfolio control: buildings identified late, scopes rewritten after new information, and contractor-role claims running alongside developer-led works. Treat building safety remediation with the same discipline you apply to a live new-build package, or the provision will keep moving after you thought the register was closed.

Vistry’s interim results for the six months to 30 June 2026, reported on 24 September, make that point hard to ignore. Construction News reported the group’s building safety provision at £352.8m, up from £303.6m at 31 December 2025. That movement included an additional £73.7m provision, £30m used in the period and a £5.5m discount unwind. The increase reflected a small number of buildings newly added to the developer portfolio, revised remediation estimates after new information, and further claims where Vistry had acted as contractor. All buildings in the provision had been assessed, and remediation had been completed on 15 buildings in the period.

The same day, Construction Enquirer set out the wider reset: operating regions cut from 25 to 12, annual output steered toward around 12,000 homes, a £661m statutory first-half loss including a £475m goodwill impairment and a further £73m building safety charge, and a shift toward roughly 60% partner-funded delivery with a retreat from South East open-market risk. Those are strategy and capital decisions. For commercial, design and build teams running remediation programmes, the useful lesson sits in the provision movement itself.

Why provisions keep moving after the first register

Most developer and main contractor portfolios did not start with a clean, closed list of affected buildings. Registers grew as surveys completed, as design information arrived, and as liability lines between developer role and contractor role were tested. That is normal. What is not normal is treating remediation as a special category of work that sits outside ordinary commercial control.

Late identification of buildings is a discovery problem with commercial consequences. Every newly added asset needs a scope baseline, a design package, a specialist supply chain, and a valuation route. If those arrive after the central provision has already been set, the next reporting period will look like a surprise even when the technical work is competent.

Revised estimates after new information are usually design and survey led. Fire strategy updates, intrusive investigations, and product substitutions change quantities, durations and prelims. If those changes are not captured as numbered instructions against a controlled drawing set, the commercial team is left reconciling invoices to a scope that no longer exists on paper.

Contractor-role claims running beside developer-led works create a second commercial lane. Different contracts, different employers, different evidence standards. Without clear separation of records, valuations and risk registers, one programme starts to subsidise the other in the accounts even when site teams believe they are keeping them apart.

Run remediation like a live package

The operational answer is dull, and it works. Give remediation the same package controls you would insist on for a multi-trade new-build block.

Start with a building register that is owned, dated and versioned. Each building needs a status (assessment, design, tender, on site, complete), a responsible commercial lead, and a link to the live drawing issue. Assessment complete does not mean commercially closed. It means you can price and programme with a defined baseline.

Hold the design information as tightly as you would on a live IRS. Remediation packages fail commercially when cladding details, firestopping layouts and product approvals circulate as email attachments while the valuation is still being certified against an old issue. Bulk upload and IRS tracking with late and on-time flags is not a nice-to-have for fire remediation; it is how you stop revised estimates arriving as uncontrolled scope creep.

Force technical submittals through a formal approval path. Samples, system certificates and installer method statements need a trail that client, funder and building safety dutyholders can see. QR-linked photo submittals and sample packs on SubTrada are one way to keep that trail attached to the building and the instruction, rather than buried in a site WhatsApp thread.

Select specialists the same way you would for any high-risk package. Live insurance expiry, staged PQQ and evidence of competence matter more on remediation than on a routine internal fit-out. A directory with deep profiles, insurance status and a four-tier PQQ process is how commercial managers keep the approved list current when programmes stretch over years.

Number every variation and instruction. Verbal site decisions on firestopping extents or temporary works do not survive a later claim review. Approve the change, issue an instruction number, then let valuation follow the instruction. That sequence is basic JCT and NEC hygiene; remediation programmes often skip it because the work feels reactive.

Certify valuations against a schedule that mirrors the building register. Client and fund visibility of progress is not a reporting luxury when partner-funded delivery is rising and open-market exposure is falling. If your board or JV partner can see which buildings are assessed, instructed, complete and certified, the next provision movement is explained before it becomes a story.

Worked example: one building, two roles

Take a mid-rise block where your group was developer on the original scheme and later faces a contractor-role claim on an adjacent block built under a different form of contract.

On the developer block you hold the building safety remediation package as a live works package. Drawing issue R12 is the baseline. An intrusive survey revises the cavity barrier extents. Design issues R13. Commercial raises instruction 047 against the specialist cladding contractor. Valuation period 6 certifies measured work to R13 plus instruction 047 only. Client portal shows building status moved from “design” to “on site” with the instruction attached.

On the contractor-role block you open a separate cost code, separate instruction series and separate evidence folder. Correspondence that mixes both buildings is rejected at commercial review. When a provision line moves because of “additional claims where we acted as contractor”, you can point to a closed file rather than a shared inbox.

That is portfolio control in practice. It is slower day to day than letting site teams “just get on with it”. It is faster when the auditors, the funder or the next interim results ask why the number moved.

Checklist for commercial managers on remediation portfolios

• Confirm every building in the provision has an owned register entry, status date and named commercial lead.

• Lock a drawing/IRS baseline before inviting specialist prices; re-baseline only by numbered instruction.

• Route technical submittals and samples through a formal approval trail visible to client and dutyholders.

• Keep developer-led works and contractor-role claims on separate codes, instruction series and valuation schedules.

• Certify valuations only against the current issue and approved instructions; refuse orphan invoices.

• Give client and fund partners a progress view that matches the building register, not a narrative slide deck.

• Revisit insurance and PQQ currency for specialists on a fixed cycle for the full programme life, not only at tender.

FAQ

Why do building safety provisions rise even after buildings are assessed?

Assessment closes the survey question; it does not freeze cost. New buildings can still enter the developer portfolio, scopes change when further information arrives, and contractor-role claims can sit outside the original developer register. Vistry’s own explanation of the £73.7m addition covered those three drivers.

Should remediation sit outside normal valuation certification?

No. Special treatment creates orphan costs. Use the same certification rules you would on a live package: current drawings, numbered instructions, measured work and clear retention treatment under the form of contract in play.

How should design teams handle revised fire remediation scopes?

Issue a new drawing revision, update the IRS, and only then allow commercial to instruct. Pricing against verbal extents is how revised estimates become untraceable provision movements.

What changes when partner-funded delivery becomes the majority of output?

Client and fund visibility of remediation progress becomes part of the commercial offer, not an internal report. Partner-funded structures tolerate less narrative and more auditable status on buildings, instructions and certified value.

What to do on Monday

Pull your remediation register and ask one question of each live building: can we show the current drawing issue, the last numbered instruction, the specialist’s insurance and PQQ status, and the last certified valuation line without opening someone’s email? If the answer is no, the provision risk is operational, not just technical. Fix the package controls first. The market will keep producing large remediation balances; the commercial teams who treat those balances like live packages will stop being surprised by them.