Personal guarantees in development finance and JV structures

The loan is to the company; the guarantee is yours. On a standard UK development facility as of June 2026, a developer borrowing £1,105,000 through an SPV will sign a personal guarantee capped at 20% to 25% of the facility, £221,000 to £276,000 of personal exposure, plus a cost overrun guarantee that has no cap at all. Add a mezzanine layer and a second guarantee commonly covering 100% of that lender’s principal sits behind the first. The personal guarantee package, not the interest rate, is where the real risk on a development facility is allocated, and it is also the part of the term sheet developers spend the least time negotiating.

This guide sets out what each guarantee type covers, what is market standard at each layer of the capital stack, how joint venture structures multiply or dilute the exposure, what is genuinely negotiable, and what enforcement looks like when it happens. One caveat up front: this is general information from the structuring side, not legal advice, and no developer should execute a guarantee without independent legal review.

What a personal guarantee on a development facility covers

Development loans are made to special purpose vehicles (SPVs, single-project limited companies) precisely so that liability is contained inside the project. The personal guarantee (PG) is the lender’s deliberate puncture of that containment: a separate contract, executed as a deed, in which the individuals behind the SPV promise to meet its obligations personally if it does not. It is not security over a specific asset; it is a claim against everything the guarantor owns, up to the cap, enforceable through the courts and ultimately through bankruptcy proceedings.

The market standard cap on senior development facilities is 20% to 25% of the facility amount. The figure is not arbitrary. A lender modelling a failed scheme assumes it will appoint a receiver, finish or sell the part-built works, and recover most of its money from the site; the modelled shortfall in that scenario, forced-sale discount, receiver’s costs, a soft market, lands consistently in the 15% to 25% band, and the PG is sized to cover the modelled gap rather than the whole loan. Lenders also know a guarantee for 100% of a £1.1m facility is mostly theatre: very few guarantors could pay it, and a guarantee beyond the guarantor’s net worth adds paperwork, not recovery. The cap is the credible-claim number. What the PG is really buying, beyond the money, is behaviour: a personally exposed developer finishes the building, returns calls in a workout and does not walk away, and every credit committee knows it.

Cost overrun and interest shortfall guarantees: the uncapped layer

Alongside the capped PG sit two narrower but sharper instruments. The cost overrun guarantee obliges the guarantor personally to fund any build costs beyond the facility and the contingency: if the contract sum grows £150,000 mid-build, that £150,000 is the guarantor’s to find, in cash, when the monitoring surveyor certifies it. It is typically uncapped, and the reason is mechanical rather than aggressive. The lender committed a fixed facility against a fixed cost plan; an overrun is, by definition, money outside that plan, and it is unbounded, nobody can cap in advance what a problem not yet discovered will cost. A capped overrun guarantee would leave a funding hole exactly where the facility is most likely to fail, a part-complete building that is worth less than the debt secured on it until it is finished. So the lender passes the unbounded risk to the party who controls it: the developer who set the budget, chose the contractor and signed the contingency line. The interest shortfall guarantee works the same way at the back end of the loan: if the programme overruns and the rolled-up interest exhausts the interest allowance inside the facility, the guarantor funds the excess interest personally until sales complete. Both instruments convert programme and cost discipline from a commercial preference into a personal one, which is precisely their purpose.

Guarantees by layer of the development capital stack

Each layer of the stack takes a different guarantee package, and the gradient follows risk position exactly. Senior lenders, first charge, first repaid, take the capped PG plus overrun and shortfall guarantees. Stretch senior lenders, carrying leverage to 85% to 90% of cost on a single facility, take a fuller package, higher caps and tighter overrun terms, because the equity cushion beneath them is thinner. Mezzanine lenders, second charge and repaid only after the senior is whole, commonly require a PG of up to 100% of their principal: their £425,000 sits exactly where a 15% valuation miss lands, and the guarantee is a large part of their recovery case, as covered on the mezzanine finance page and in the senior versus mezzanine guide. Equity takes no guarantee at all: a JV partner investing into the SPV holds shares, board rights and contractual remedies, not a claim on the developer’s house. Funding the top of the stack with equity rather than debt is therefore also a decision about personal exposure, not just about cost.

How JV structures change personal guarantee exposure

Bring a partner into the SPV and the guarantee question becomes a negotiation among three parties, not two. Lenders default to taking PGs from every meaningful shareholder, normally anyone over 20% to 25%, on a joint and several basis: each guarantor is liable for the full guaranteed amount, and the lender chooses whom to pursue, typically the one with the most accessible assets, leaving that person to claim contributions from the others afterward. A developer whose JV partner is wealthier should understand they are not thereby protected; a developer who is the wealthier party should understand they are the target. Three structures change the allocation. A corporate JV partner with a strong balance sheet can offer a corporate guarantee in place of, or alongside, personal ones, and lenders weight an institutional covenant heavily. Some funding partners whose model is backing developers will stand behind the overrun risk themselves, shrinking the individual’s exposure to the capped PG or below; the structures are described at joint venture development finance. And between the guarantors themselves, a contribution deed or cross-indemnity fixes internally who bears what share if the lender enforces against one of them, an agreement that belongs in the same drawer as the shareholders’ agreement and is covered in the guide to JV agreements and SPV structures. The omission developers regret is signing joint and several guarantees with no contribution deed: the lender’s position is defined to the pound while the partners’ positions against each other are defined by an expensive argument.

Negotiating the guarantee package: caps, releases and carve-outs

Guarantees are negotiated hardest before terms are issued, when lenders are competing, and barely at all afterward. The points with genuine give in them, as of June 2026: the cap, where a sponsor with completions and a scheme at sensible leverage can push a 25% ask toward 20%, and where accepting a slightly higher margin for a lower cap is sometimes a rational trade. Release triggers: the PG reducing or falling away at practical completion, at a loan-to-value threshold once sales begin, or on repayment of a defined portion of the facility; lenders agree these more readily than cap reductions because the trigger only fires once their risk has actually fallen. Carve-outs: limiting the guarantee to defined bad acts, fraud, misapplication of funds, unauthorised disposals, rather than all shortfalls; common in larger structures, rarer on small facilities, always worth asking. Asset exclusions: express exclusion of the family home from enforcement, or a side agreement not to seek a charging order against it. And insurance: personal guarantee insurance exists as a commercial product, with policies typically covering a portion of the guaranteed amount and premiums commonly quoted at 1% to 2% of the insured sum per year. It is risk transfer, not risk removal: the lender still demands against the guarantor, who claims reimbursement under the policy, and insurers impose their own underwriting and conditions. Whether the premium is worth it is a scheme-by-scheme calculation: on a £276,000 capped PG, cover has a running cost in the low thousands per year against a tail event that would otherwise reach the guarantor’s personal balance sheet.

What enforcement actually looks like when a scheme fails

Having spent 25 years on the lending side, our founder’s observation is that PG enforcement is a process of escalating pressure in which the formal legal steps come last, and usually never. It begins with the facility default and a written demand on the SPV; the demand under the guarantee follows, a letter stating the crystallised amount and a deadline measured in days. What happens next, far more often than developers expect, is negotiation, not litigation: lenders know that a guarantor pushed straight into bankruptcy stops cooperating, that bankruptcy recoveries are slow and shared with other creditors, and that the half-built scheme still needs the developer’s knowledge to finish. So the realistic sequence is a settlement conversation, a payment plan, additional security offered over other assets, or a consensual sale of something, with the lender holding the statutory demand, the formal precursor to bankruptcy proceedings under the insolvency regime administered by the Insolvency Service, as the escalation step rather than the opening move. Two implications for developers. First, conduct is currency: guarantors who engage early and credibly settle on materially better terms than those who go silent, because the lender prices cooperation into every workout. Second, the guarantee is enforced far more often by its existence than by its execution: it is the reason the developer injects the overrun, accepts the workout plan and finishes the building, which is exactly what it was designed to do. UK Finance data on commercial lending shows formal enforcement as a small fraction of distressed outcomes, and the Bank of England’s financial stability analysis of workout behaviour points the same way: the guarantee’s power is overwhelmingly exercised at the negotiating table. None of which makes signing one casual: the tail outcome is personal insolvency, and the time to manage it is at the term sheet.

Frequently asked questions

This guide is general information about market practice, not legal advice. Take independent legal advice before executing any guarantee.

Last reviewed: June 2026.