Financial Viability Assessments in Planning: A Complete Guide
If you’re applying for planning permission and can’t deliver full policy obligations, you’ll almost certainly need a financial viability assessment.
It’s the mechanism that determines how much a scheme can genuinely afford to contribute — most commonly toward affordable housing, but also Section 106 contributions, the Community Infrastructure Levy, and other planning costs.
Get it right and you unblock your consent with a negotiated, evidence-based position. Get it wrong and you’ll spend months arguing over numbers with the council’s independent reviewer. We’ve seen both outcomes plenty of times. This guide walks through how an FVA works, what goes into one, what it costs — and the reforms coming through the planning system in 2025–26 that change the rules.
Key takeaways
- An FVA tests whether a scheme can meet its full planning obligations and still leave a reasonable return — using the residual method.
- You only need one when arguing you can’t meet policy in full; policy-compliant schemes are assumed viable.
- Four inputs drive it: GDV, development costs, benchmark land value (EUV+), and developer return — BLV is the most contested.
- Since 2018, FVAs are prepared on the basis they’ll be published; credibility and evidence are everything.
- Reform is live: PPG updated Dec 2025 and a draft NPPF propose a tighter framework and a 17.5% return — still proposals (consultation closed 10 Mar 2026).
In this guide
What is a financial viability assessment?
A financial viability assessment (FVA) is a standardised appraisal that tests whether a proposed development can meet its full planning obligations and still deliver a reasonable return to the developer and landowner.
The method is straightforward in principle. You take the total scheme value, subtract all development costs and planning obligations, and see what’s left. If that residual figure falls below the benchmark land value — the minimum a reasonable landowner would accept to release the site — then the scheme can’t viably deliver everything the local plan asks for. That’s the core of the residual method, and it underpins every FVA in England and Wales.
Three documents govern how this works: paragraph 59 of the NPPF (the policy), the Planning Practice Guidance on viability (the detail, updated December 2025), and the RICS professional standard on financial viability in planning (the professional rules).
One thing that surprises a lot of applicants: not every scheme needs an FVA. The NPPF is clear that developments complying with up-to-date plan policies should be assumed to be viable. You only need a site-specific assessment when you’re arguing your scheme can’t meet those policies in full — for example where site characteristics differ substantially from the assumptions behind the local plan, where the scheme carries unforeseeable costs, or where economic circumstances have changed significantly. That’s an important distinction, because submitting an unnecessary FVA wastes time and money.
What are the key inputs of an FVA?
Every FVA is built on four main inputs: gross development value, development costs, benchmark land value, and developer return — and the PPG requires all of them to follow a standardised approach.
- Gross development value (GDV) — the total expected income from selling or renting the finished scheme, based on actual completed sales of comparable new-builds. Asking-price evidence gets challenged immediately.
- Development costs — build costs (benchmarked to BCIS), abnormal costs, professional and finance fees, CIL and contingency. Every figure must be site-specific and evidenced.
- Benchmark land value (BLV) — set by the PPG’s “EUV+” approach: existing use value (excluding hope value) plus a reasonable landowner premium. The price actually paid for the site is not a valid benchmark.
- Developer return — currently 15–20% of GDV for market housing under the PPG’s plan-making assumption, with a lower figure for affordable housing given the reduced risk.
BLV is the single most contested input in almost every FVA we work on. Developers who pay over the odds for a site and then try to use that price as the benchmark will be told, firmly, that the PPG doesn’t allow it. The assessment has to show what the land is worth in policy-compliant terms — not what someone chose to pay for it at auction. This is exactly where independent valuation expertise earns its fee.
What does the FVA process look like?
The applicant commissions the FVA, submits it with the planning application, and the council appoints an independent reviewer to check every assumption. The applicant pays for that review.
In practice it runs like this. You raise viability concerns in pre-application discussions — do this early, because surprises don’t help anyone. Then you commission the FVA from an RICS-qualified surveyor, who prepares it using the residual method with standardised inputs. You submit it alongside your planning application; some councils won’t even validate the application without it.
The council then appoints an independent viability consultant to review your assessment — either a specialist firm or the District Valuer through the Valuation Office Agency. They go through every input: your GDV comparables, your build-cost evidence, your BLV methodology, your profit assumptions. If there are disagreements — and there usually are — you go through rounds of written representations and meetings between both surveyors until a position is reached. Sometimes that’s full agreement, sometimes a compromise, and sometimes both sides agree to disagree and the planning committee makes the call.
Once a position is settled, the Section 106 agreement is drafted, increasingly with review mechanism clauses (particularly in London) that let the council capture additional contributions if the scheme performs better than the FVA projected.
3–6 months — typical time an FVA adds to the planning timeline, allowing for the council’s independent review.
£15k–£35k — typical total viability cost for a 10–50 unit scheme: your consultant’s fee plus the council’s review.
Are viability assessments made public?
Yes. Since the July 2018 NPPF revision, all financial viability assessments should be prepared on the basis that they will be made publicly available.
Before 2018, FVAs were routinely treated as commercially confidential. That was a major source of public anger — particularly on high-profile London schemes where developers used viability arguments to cut affordable housing from 35% to single digits behind closed doors. The policy shift was deliberate.
The PPG now states that information used in viability assessments is “not usually specific to that developer,” and that there’s rarely a genuine basis for keeping it confidential. In exceptional circumstances — genuinely sensitive ongoing land negotiations, for instance — an executive summary must still be published. In practice, full publication is now standard across most London boroughs and increasingly common elsewhere.
If you’re preparing an FVA today, assume it will be read by the public, ward councillors, local campaign groups, and journalists. That reality should inform how carefully you evidence every assumption.
What separates a good FVA from a bad one?
Credibility. Every assumption needs to be evidenced, justified, and defensible under independent scrutiny.
The councils and independent reviewers who assess these reports do it every day. They know what reasonable inputs look like for their area. They know what BCIS says about build costs for the relevant property type. They know what comparable new-builds have actually sold for on neighbouring sites. An FVA that inflates costs or deflates values to manufacture a viability gap gets challenged, delays the application, and damages your credibility on the next submission.
The mistakes we see repeatedly: using the price paid for land as BLV (prohibited by the PPG); generic build costs without site-specific justification; GDV based on asking prices rather than completed sales; excessive contingency that doesn’t match the scheme’s actual risk profile; and no sensitivity analysis (which the RICS standard makes mandatory).
And there’s a subtler point. An FVA prepared by someone without RICS qualification carries less weight with planning officers, committee members, and inspectors. The RICS standard sets 14 mandatory requirements, including a statement of objectivity, confirmation of no conflict of interest, and a declaration that fees aren’t contingent on the outcome. Those safeguards are what separate a professional valuation from an advocacy document.
A well-evidenced, transparent report — even one that shows genuinely difficult numbers — moves through the system far faster than one that tries to game it.
What's changing in 2025–26?
Viability is being reformed. The PPG was updated in December 2025, and a draft NPPF published the same month proposes a tighter framework — but the headline figures are still proposals, not adopted policy.
Three things are worth tracking if you’re planning a submission this year:
- The updated PPG (December 2025) sharpens how assessments are presented: a site-specific FVA should refer back to the development plan’s viability evidence and explain any differences, decision-makers can require an updated assessment if it lacks clarity, and the weight given to an FVA is explicitly theirs to determine.
- The draft NPPF (December 2025) proposes a new viability policy (“DM5”) confirming an FVA can only justify a non-policy-compliant package in limited circumstances, with standardised inputs to sit in an Annex.
- The consultation on developer return proposed narrowing the 15–20% range to 17.5% of GDV for market housing, and sought views on 6% of GDV for affordable housing, plus whether a landowner premium is always required.
Important caveat: that consultation closed on 10 March 2026 and, at the time of writing, those figures and the DM5 wording remain proposals. The current adopted framework is the NPPF (December 2024) plus the PPG (updated December 2025). If you’re preparing a case now, build it on the current rules but design the inputs so they still stand up if the tighter return figures are adopted.
A practical tool, not a loophole
A financial viability assessment isn’t about avoiding planning obligations. It’s about demonstrating, with proper evidence and a standardised methodology, what a specific scheme can realistically deliver. The policy framework is clear, the process is well established, and the expectations around transparency have never been higher.
We prepare and review FVAs for schemes across the UK, from small residential sites to major mixed-use developments. Related reading: what goes into a robust FVA report, FVAs for mixed-use and residential schemes, and how viability interacts with affordable housing and wider land development.
Frequently asked questions
No. If your scheme complies with up-to-date local plan policies, it should be assumed viable and no FVA is needed. You only need a site-specific assessment when you’re seeking to deliver less than full policy obligations — and you have to justify why your circumstances warrant it.
Benchmark land value (BLV) is the minimum land value used to test whether a scheme is viable. The PPG requires the “EUV+” approach: existing use value (excluding hope value) plus a reasonable premium to the landowner. It matters because it’s the line the residual value is measured against — and because the price actually paid for the site is not a valid benchmark. Get the BLV wrong and the whole assessment falls over.
For a medium-scale residential scheme of 10–50 units, expect roughly £15,000–£35,000 in total viability costs — your consultant’s fee plus the council’s independent review, which the applicant pays for. Larger or more complex schemes cost more.
Typically 3–6 months on top of the standard planning timeline, allowing for the council to appoint an independent reviewer and for both surveyors to work through the inputs to an agreed (or disputed) position.
Generally no. Since 2018, FVAs should be prepared on the basis that they’ll be published. Only genuinely sensitive information can be withheld, and even then an executive summary is usually published.
It can, but only where the evidence genuinely shows the policy-compliant level can’t be delivered — and increasingly subject to a Section 106 review mechanism that claws back contributions if the scheme outperforms. An FVA is not a shortcut to lower obligations; it’s a transparent test that the council’s independent reviewer will scrutinise.
An RICS-qualified surveyor working to the RICS professional standard Financial Viability in Planning: Conduct and Reporting. Assessments prepared outside that framework carry less weight with planning officers and inspectors.
The PPG was updated in December 2025, and a draft NPPF proposes a new viability policy plus standardised inputs and a narrower developer return (a proposed 17.5% of GDV for market housing). The consultation closed on 10 March 2026 and those changes are not yet adopted — the current rules still apply.
Preparing a viability case — or need one reviewed?
Talk to our valuation team
Our RICS Registered Valuers prepare and independently review financial viability assessments for schemes across London and the South East — evidenced, transparent, and built to stand up to the council’s reviewer.