Grant funding and its treatment in a viability appraisal
Grant improves the residual, which makes it harder to argue for less affordable housing. Understanding additionality and drafting for a grant that does not arrive is the practical work.
Grant funding in a viability appraisal raises the residual land value, because it increases what a registered provider can pay for the affordable homes. That makes it harder, not easier, to argue for a reduction in the affordable housing the plan requires. Applicants sometimes arrive expecting grant to be a card that helps them. In a planning appraisal it usually is not, and understanding why saves an argument at the wrong moment.
Planning Practice Guidance treats grant as part of the picture: where grant funding is available it should be taken into account in assessing viability. The interesting questions are what "available" means, and what the funder expects in return.
Why grant is treated cautiously
Two reasons pull in different directions and both are legitimate.
From the authority's side, grant is real money that raises the transfer value of the affordable units and therefore the scheme's residual. An appraisal that omits available grant understates viability and overstates the case for a reduced obligation.
From the funder's side, grant is meant to be additional. Public subsidy that simply replaces a contribution the developer would otherwise have made through the planning system delivers nothing extra, so funding programmes carry additionality expectations. Grant is generally directed at homes beyond the policy requirement, or at a deeper tenure than policy would secure, rather than at the policy-compliant baseline.
Put those together and the working position is this. Grant should be in the appraisal where it is available for the units in question. And grant should not be the mechanism that gets the scheme to policy compliance, because the funder is unlikely to support that and the authority will say the obligation should have been met without it.
Grant secured against grant assumed
The distinction decides how a reviewer treats the figure.
| Status | Evidence | Treatment in the appraisal |
|---|---|---|
| Secured | Executed grant agreement or a firm allocation to the scheme | Include at the confirmed rate |
| Bid submitted, undetermined | Bid documents and funder correspondence | Disclose, model as a sensitivity |
| Assumed from programme rates | No application made | Disclose the assumption and its basis |
| Available through a partner's allocation | Registered provider's confirmation in writing | Include where the provider confirms it applies to these units |
Secured grant goes in at the confirmed amount. Assumed grant should be disclosed and tested as a sensitivity rather than embedded silently in the affordable transfer value, because a reviewer who discovers it by working backwards from the transfer value will stop trusting the rest of the appraisal.
The most common source of confusion is the fourth row. A registered provider's offer for the affordable units may already reflect grant from its own strategic partnership allocation. In that case the grant is in the appraisal whether the developer mentions it or not, as part of the transfer value, and the right thing to do is to say so and show the build-up.
Effect on the affordable transfer value
Grant enters the appraisal through the transfer value, not as a separate income line. A registered provider prices the units from the rent or sale receipts it expects, less management and maintenance, capitalised at its own cost of capital, plus any grant it can apply. Grant lifts the amount it can pay.
Show the build-up rather than the total. A transfer value stated as a percentage of open market value is not evidence, and a reviewer cannot tell whether the percentage includes grant or not. Show the rent assumption, the tenure, the grant applied per unit where applicable, and the resulting value per unit and in total.
Two details repay attention. Grant is usually tenure-specific, so it can change the tenure mix rather than merely the value, and a deeper tenure supported by grant may be a better planning outcome than more units at a shallower tenure. And grant conditions may restrict the disposal or the rent-setting, which affects the value the provider can attribute.
The consequence for the affordable offer belongs in the Affordable Housing Statement, and the appraisal itself in the Viability Assessment. Keep the two consistent on tenure, unit numbers and transfer value, because the most common inconsistency in a submission is an affordable statement describing a mix the appraisal has not valued.
Where grant changes the argument rather than the numbers
Sometimes grant does help, and it is worth knowing where.
Where a scheme is unviable at policy compliance on the evidence and the shortfall is modest, grant applied to the additional units can close the gap in a way the authority can accept, because the outcome is more affordable housing rather than less. Where the plan seeks a tenure the market cannot support, grant applied to social rent can deliver it. And on a brownfield site with heavy abnormal costs, funding directed at remediation rather than at the homes changes the appraisal without touching the affordable transfer value at all.
In each case the argument is about outcomes. Frame the submission that way rather than presenting grant as a reason to discount the obligation, and the conversation is shorter.
Recording the assumption for a review mechanism
A viability appraisal is a snapshot, and grant is one of the inputs most likely to change after the decision. That makes it a natural candidate for a review mechanism.
- State in the appraisal whether grant is secured, bid for or assumed, with the amount and the programme.
- Provide for an early stage review if implementation is delayed beyond a stated period, with grant status as one of the inputs tested.
- Provide for a late stage review that captures grant actually received against grant assumed, with an uplift in obligation if the position improved.
- Cap the review outcome at the policy-compliant requirement, so the mechanism cannot produce more than the plan asks for.
- Fix the inputs the review will use, by name, so the exercise does not become a fresh negotiation.
The drafting is fiddly and it is worth the effort. Review mechanisms that specify their inputs are applied. Review mechanisms drafted as an agreement to appraise again produce a dispute. The same discipline applies to overage and clawback provisions generally, which are covered in the note on drafting overage and clawback in a section 106.
What happens if the grant does not arrive
Draft for it, because it happens. Programmes close, allocations are reprioritised, and bids fail.
The workable device is a cascade in the section 106 agreement. If grant is confirmed by a stated date, the scheme delivers tenure A at the stated number. If it is not, the scheme delivers tenure B, still at a number the authority has accepted, without a further application. The authority gets certainty about what will be built and the developer gets certainty about what it is committing to.
Two cautions. The fallback has to be something the authority would accept on its own terms, or it is not a fallback but a licence to under-deliver. And the date has to be realistic against the funding programme's own timetable, not against the developer's preferred programme.
Where the grant underpins something the developer cannot control, consider whether a negative condition rather than an obligation is the better instrument, which turns on who controls delivery. The distinction is set out in the note on Grampian conditions or planning obligations, and the treatment of competing appraisals where matters go further is covered in the note on viability at appeal.
See PlanScope pricing if you want a structured first draft of the supporting statements while the funding position is being resolved.
This is general guidance, not legal advice. For specialist technical reports, qualified professional input may be required. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Does grant funding help a viability case?
Usually the opposite. Grant raises the transfer value of the affordable units and therefore the residual, which strengthens the authority's position rather than the applicant's. Grant helps where it is applied to homes beyond the policy requirement or to a deeper tenure, because the outcome is more affordable housing rather than a reduced obligation.
What does additionality mean for grant in planning?
That public subsidy should deliver something the planning system would not have secured anyway. Funding programmes therefore expect grant to support homes above the policy requirement, or a deeper tenure than policy would achieve, rather than substituting for the developer's contribution. Using grant to reach policy compliance tends to fail on that test.
Should assumed grant be included in the appraisal?
Disclose it and model it as a sensitivity rather than embedding it in the transfer value. A reviewer who works backwards from the transfer value and finds unexplained grant will treat the whole appraisal with suspicion. State whether grant is secured, bid for or assumed, with the amount and the programme it relates to.
How should the transfer value be presented?
As a build-up rather than a percentage of open market value: the rent or sale assumption, the tenure, management and maintenance deductions, the capitalisation rate, and any grant applied per unit. A percentage figure tells a reviewer nothing about whether grant is inside it, which is the question they will ask.
What if the grant does not come through?
Provide a cascade in the section 106 agreement: one tenure mix if grant is confirmed by a stated date, a different mix the authority has already accepted if it is not. That avoids a further application. Set the date against the funding programme's timetable rather than the construction programme.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.