Flagship Guide · Property Development Finance
Development Finance: How I Think About Cost, Contingency, GDV and Exit
Development finance is not simply a larger version of bridging. The lender is funding a moving target: land or buildings today, works over time, and a future value that only exists if the borrower executes the plan. I therefore think about development lending through four connected questions — what will it really cost, what can go wrong, what is the completed scheme really worth, and how does the lender get repaid?
Start with the real project
Development finance funds an execution risk.
A lender assessing an investment property can often underwrite an asset that already exists in broadly its finished form.
Development is different.
The value at the end may be significantly higher than the value at the start, but somebody has to create that value.
Planning has to hold.
Works have to be delivered.
Costs have to remain controlled.
Contractors and professionals have to perform.
The market has to support the eventual sale or refinance.
And the project has to survive long enough financially for all of that to happen.
The lender is not financing the GDV. The lender is financing the journey required to turn today’s site into that future value.
My four questions
Cost. Contingency. GDV. Exit.
I tend to reduce development cases to four core questions before getting lost in the detail.
Land, construction, professional fees, finance, planning obligations, utilities, tax, marketing, sales costs and everything else required to reach completion.
Every project contains uncertainty. The issue is whether contingency, equity and liquidity are sufficient when one or more assumptions move against the borrower.
GDV must be supported by evidence, not simply by the number required to make the appraisal work.
Sale, refinance or another defined route. The exit has to work after time, cost and valuation stress.
If one of those four is weak, the rest of the project needs to be exceptionally strong to compensate.
Total development cost
The build cost is not the same as the development cost.
A surprisingly common mistake is focusing too heavily on the contractor’s number.
The contractor may quote £1.5 million for the works.
That does not mean the project costs £1.5 million.
There may be acquisition costs, professional fees, structural engineers, architects, planning consultants, building control, warranties, utilities, infrastructure, demolition, surveys, insurance, legal costs, finance costs, marketing, agent fees and sales costs.
There may also be planning obligations, Community Infrastructure Levy where applicable, abnormal ground conditions or other site-specific costs.
The lender wants to understand the total cost to reach the point where the exit can actually occur.
| Cost category | Examples | Why it matters |
|---|---|---|
| Acquisition | Purchase price, tax, legal and transaction costs. | Defines the initial basis and borrower equity requirement. |
| Construction | Main contract, demolition, enabling works, materials and labour. | Usually the largest controllable part of the development budget. |
| Professional | Architect, engineer, QS, planning, project management and specialist consultants. | Necessary to design, monitor and deliver the scheme properly. |
| Statutory / infrastructure | Utilities, highways, planning obligations, building control and related items. | Can be material and are often underestimated early. |
| Finance | Interest, arrangement fees, valuation, monitoring, legal and exit-related finance costs. | Time overruns directly increase this category. |
| Sales / exit | Agents, marketing, legal sales costs, incentives and refinance costs. | The project is not finished economically until the debt is repaid. |
The development appraisal
A good appraisal is a model of the downside, not just the profit.
Most development appraisals look attractive when every assumption is placed at its optimistic end.
That is not what interests me.
I want to know how much room exists between the base case and the point where the deal stops making sense.
What happens if construction costs rise?
What if the programme extends?
What if sales take longer?
What if the GDV is lower?
What if the borrower has to fund an unexpected item without another lender advance?
The appraisal is therefore not merely a forecast.
It is a way of understanding which assumptions carry the greatest risk.
Contingency
Contingency is not spare profit. It is money for things we do not yet know.
I am wary when contingency is treated as a theoretical percentage that nobody expects to use.
Projects uncover things.
Ground conditions differ from surveys.
Materials move in price.
Designs evolve.
Building control requests changes.
Weather delays work.
Contractors discover hidden defects in refurbishment schemes.
None of that automatically makes a project bad.
The question is whether the borrower has priced uncertainty into the capital structure.
My test: if the contingency is consumed halfway through the programme, where does the next pound come from?
If the answer is “there is nowhere else”, the development is relying on the budget being nearly perfect.
Borrower equity
The developer needs enough capital to remain a decision-maker when the project becomes difficult.
Equity does more than reduce lender leverage.
It gives the borrower room to respond.
A developer with no liquidity beyond the minimum contribution can become dependent on the lender for every unexpected cost.
That changes the relationship and the risk.
I want to understand not only how much equity goes into the project on day one, but what liquidity remains afterwards.
Can the borrower absorb a cost overrun?
Can they fund a delayed draw?
Can they finish a unit, resolve a legal issue or carry interest for longer without immediately creating distress?
A strong project can still fail if the capital structure leaves nobody with the ability to solve a relatively ordinary problem.
LTGDV and LTC
Leverage needs to be understood against both cost and value.
Development lenders commonly look at leverage against total development cost and against gross development value.
Those measures answer different questions.
| Measure | What it compares | What it tells me |
|---|---|---|
| LTC | Loan relative to eligible project cost. | How much of the project’s actual cash requirement the lender is funding. |
| LTGDV | Loan relative to the expected completed gross development value. | How much value cushion should exist at completion if the GDV is achieved. |
| Day-one LTV | Initial advance relative to the starting asset or site value. | How exposed the lender is before the works create additional value. |
A deal can look conservative on LTGDV while still requiring very high lender funding of cost.
Or it can look comfortable on LTC while relying on an aggressive GDV.
I therefore prefer to see the measures together rather than choosing whichever one makes the case look strongest.
GDV
Gross Development Value is the most powerful number in the appraisal — and one of the easiest to overstate.
GDV is the expected aggregate value of the completed scheme.
It matters because it drives developer profit, lender leverage, equity return and the apparent refinance or sale cushion.
A small change in GDV can therefore change the whole project.
I want the GDV built from evidence.
Comparable completed sales.
Realistic unit sizes.
Current market conditions.
Appropriate price per square foot where relevant.
Location and specification.
Supply expected to reach the market at the same time.
And a sensible allowance for incentives or selling friction.
If the GDV only works because every unit achieves the best comparable price in the area, I do not think we have a base case. We have a target.
Worked example
Why a 10% GDV fall can destroy far more than 10% of the profit.
Total cost £4.0m · GDV £5.0m
At the original appraisal, the scheme appears to generate £1.0m of gross development profit before any items not already captured in the total cost.
Now assume the GDV falls by 10%, from £5.0m to £4.5m.
The project value has fallen by £500,000 — but the apparent development profit has fallen from £1.0m to £500,000.
A 10% reduction in GDV has cut the headline profit by 50%.
This is one reason lenders care about margin.
The project needs enough economic cushion to absorb ordinary valuation movement without immediately turning the developer’s return — and therefore incentive to complete — into something marginal.
Cost overruns
Cost risk is dangerous because the money is usually needed before completion.
A lower GDV hurts the end of the project.
A cost overrun can stop the project before it gets there.
That makes cost risk especially important.
If the development budget increases by £300,000, somebody needs to fund that £300,000 while the site is still incomplete.
The future GDV does not write the cheque.
That is why lenders care about quantity surveyor monitoring, draw controls, contingency, borrower equity and cost-to-complete.
The most important question at each draw is not simply how much has already been spent.
It is whether the remaining committed capital is sufficient to finish the scheme.
Cost to complete
The lender should always know what it takes to get from today to the exit.
As the project advances, sunk cost becomes less important than remaining cost.
A partially completed development may have absorbed millions, but if another £1 million is needed to reach practical completion and only £700,000 of committed funding remains, there is a problem.
I therefore think about development funding dynamically.
What is complete?
What remains?
What value has been created?
What money remains available?
And what risks have emerged that were not visible at day one?
That is why monitoring is not administrative bureaucracy.
It is part of the credit process.
The programme
Time is a development cost.
A project delay does not simply move the completion date.
It can extend interest, monitoring costs, insurance, professional fees, site overhead, contractor exposure and the period before sales proceeds arrive.
It can also move the project into a different market.
A scheme expected to sell in spring may instead reach buyers in winter.
An expected refinance may arrive after rates or lender criteria have changed.
A delay can therefore affect both cost and exit simultaneously.
I want the programme to contain realistic float rather than assuming every stage happens at the first possible date.
Contractor risk
The cheapest build contract can become the most expensive decision.
Contractor selection matters because lenders are ultimately relying on execution by a third party.
I want to understand experience, financial strength, track record on comparable schemes, contract structure, payment terms and whether the contractor has the operational capacity for the project.
A low tender can be attractive.
But if it is unrealistically low, the project may simply discover the real price later through variations, delays or contractor failure.
The same applies to the professional team.
Architect, engineer, QS, project manager and solicitor all influence how quickly problems become visible and how effectively they are resolved.
Planning and technical risk
A funded project should know what it is legally and technically allowed to build.
Planning risk varies enormously between a fully consented development and a project still dependent on future approvals.
I want the finance structure to match that stage.
Are all material conditions discharged or capable of being satisfied within the programme?
Are there pre-commencement conditions?
Are rights, access, party wall, easements, utilities and title issues resolved?
Are warranties and building regulations accounted for?
Is there any dependency on a third party that the borrower does not control?
The more uncertain the technical route, the more liquidity and time I expect the project to carry.
Refurbishment versus ground-up
Existing buildings reduce some risks and introduce others.
Refurbishment can look lower risk because the structure already exists.
But existing buildings hide things.
Roof, drainage, services, structure, asbestos, damp, fire compliance and previous alterations can all create surprises.
Ground-up development has different uncertainty: ground conditions, foundations, infrastructure, weather exposure and longer construction programmes.
I do not think one is automatically safer.
The underwriting needs to identify where the uncertainty sits and whether the budget, contingency and team are appropriate for that type of risk.
Experience
The borrower does not need to know everything — but somebody on the team does.
Development is a team activity.
A first-time developer can sometimes complete a strong project if the professional and delivery team around them is credible and the project is appropriately sized.
An experienced developer can still struggle if the scheme is outside their normal scale, geography or construction type.
I therefore do not reduce experience to a simple number of previous projects.
I want to know whether the collective team has solved the problems this particular project is likely to create.
Drawdowns
Development finance is released as value is created.
Unlike a simple acquisition loan, development facilities are commonly drawn in stages.
The initial advance helps fund the site or starting asset.
Subsequent advances are made as works progress and eligible costs are incurred, typically subject to monitoring and the lender being satisfied with the remaining cost-to-complete position.
Borrowers therefore need to understand cash-flow timing.
A lender approving a total facility does not mean every pound is available on day one.
If contractor payment dates and lender draw mechanics are misaligned, the project can create a cash-flow problem even when the total budget is technically funded.
Interest
Rolled or retained interest does not make the finance free until the end.
Development interest is often retained or rolled rather than paid monthly from the borrower’s operating cash.
That can be appropriate because the development may not produce income during construction.
But the interest is still part of the economics.
Longer programmes consume more of the facility.
Additional borrowing can increase interest cost.
A delayed sale extends the period before debt is repaid.
I therefore want interest treated as a genuine project cost rather than an invisible deduction from future profit.
The exit
The development is not complete when the building is finished.
From a lender’s perspective, practical completion is only one milestone.
The debt still has to be repaid.
There are usually two broad exits: sale or refinance.
Sale exit
I want evidence for demand, pricing, expected sales velocity and the likely buyer pool.
On multi-unit schemes, I also want to know whether the borrower needs to sell every unit to repay the debt or whether staged sales progressively reduce lender exposure.
Refinance exit
I want the completed property to meet the likely criteria of the next lender.
That may involve valuation, rental coverage, tenancy, stabilisation, certificates, warranties, lease structure and borrower affordability.
A refinance cannot simply be assumed because the GDV is higher than the development debt.
Worked exit stress
A bridge to sale or refinance needs to survive slower timing.
12-month build · 18-month facility
Suppose a project is expected to complete construction in 12 months, leaving six months for sales or refinance.
That may look comfortable.
But if construction slips by three months, half the exit window has disappeared before the first buyer or refinance lender can complete.
If the project then needs a three-month extension, the borrower has additional interest and potentially extension costs precisely when liquidity may already be tight.
This is why I prefer the facility term to reflect the realistic programme plus a credible exit period, not the most optimistic timetable everyone can put into the model.
Profit on cost
Developer profit is part of the lender’s risk cushion.
Lenders are not trying to maximise the developer’s profit.
But a sensible profit margin matters because it absorbs adversity.
If a project begins with a very thin margin, a modest cost overrun or GDV reduction can eliminate the developer’s return.
Once the borrower has little or no economic upside left, incentives can change.
A healthy margin therefore gives both borrower and lender more room when reality differs from the appraisal.
My development checklist
What I want clear before I become interested in the headline facility.
What exactly can be built, what conditions remain and what title, access or third-party issues could delay the programme?
Not just works — all costs required from acquisition through repayment.
How much uncertainty is priced in, and what additional capital is available if contingency is consumed?
Critical path, realistic duration, contractor capacity and sufficient time for the exit after practical completion.
Developer, contractor, QS, architect, engineer and other professionals with relevant capability.
Comparable sales, unit pricing, specification, market supply and a credible downside valuation.
Day-one advance, draw process, borrower equity, interest treatment and cash-flow timing.
Sale or refinance evidence, expected timing and a fallback if the primary route slows.
Red flags
What makes me slow down on a development case.
Then it is not really being treated as contingency.
I still want to see the comparables and understand why.
I want evidence of comparable scale, financial capacity and delivery.
Refinance is a new underwriting event with its own valuation and criteria.
That leaves almost no room for construction delay or the exit process.
Additional lender funding is never a substitute for a robust original capital plan.
Structure first
The cheapest development facility can be expensive if it leaves the project with no room.
As with other forms of property finance, I care about more than the headline rate.
The day-one advance matters.
The works contribution matters.
The draw mechanism matters.
The treatment of contingency matters.
The term matters.
The interest reserve matters.
Monitoring and legal mechanics matter.
Extension options matter.
A lower rate does not compensate for a structure that creates a cash-flow crisis halfway through the build.
That is why I keep coming back to the same principle: structure matters more than rate.
Development versus bridging
Choose the facility for the work being done, not the label attached to the property.
Not every refurbishment needs development finance.
Not every project that someone calls a “refurb” belongs on a simple bridge.
The distinction often sits in the scale and complexity of the works, whether structural change is involved, whether the property remains habitable or income-producing, how costs are funded, and how much monitoring the lender needs.
The correct facility should match the execution risk.
Trying to squeeze a development project into a simpler product purely because the rate or process looks easier can create problems later when the lender discovers the true scope.
The bigger principle
Good development finance makes uncertainty visible.
No lender can remove construction risk.
No developer can know every cost in advance.
No valuer can guarantee the GDV.
No programme survives every project unchanged.
The objective is therefore not to pretend uncertainty does not exist.
It is to identify where it sits and provide enough capital, time, monitoring and margin to absorb it.
That is what a well-structured development facility should do.
Final thought
The project should still work when the spreadsheet stops being perfect.
When I assess development finance, I am ultimately asking whether the project can finish and repay the debt if one or two things go wrong.
The cost needs to be complete.
The contingency needs to be real.
The GDV needs independent support.
The borrower needs liquidity.
The team needs the capability to deliver.
The programme needs room.
And the exit needs to survive a more conservative market than the one assumed on day one.
A development deal becomes fundable when the lender can see not only how the borrower makes money if the plan works, but how the project still reaches repayment when the plan moves.
Important: this article is general educational information, not personal financial, legal, tax, investment or lending advice. Development finance criteria, leverage, pricing, monitoring requirements and lender appetite vary by lender and transaction and can change. All projects require case-specific valuation, underwriting, legal and technical due diligence.
Funding route
The right development route depends on the project, borrower and execution risk.
I prefer to understand the scheme first and then decide where the finance belongs.
For specialist direct-lending situations that fit current appetite, including short-term property finance where structure and execution can be underwritten directly.
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