How to read an overage agreement: triggers, uplift and how it binds you

01 What overage is, and where it hides in a data room

An overage agreement, also called clawback, uplift or an anti-embarrassment clause, is a promise by a buyer of land to pay the seller a further sum if the land later becomes more valuable in a defined way. The classic case is a field sold at agricultural value with a promise to pay a share of the increase if planning permission is later granted. On industrial and logistics land the same device turns up on former public sector sites, on land bought from a landowner who suspected it would one day be rezoned, and on plots sold out of a larger estate by a developer who wanted a share of any denser scheme.

It matters to a bidder for a simple reason: overage is a cost of the scheme that is not in the price. If the deed was written to catch a change of use to distribution, or a denser floorplate, or a sale with planning, then the uplift your appraisal is chasing is partly owed to someone else.

You will rarely find overage under its own name in a data room index. Look for it in three places. In the proprietorship register of the title, as a restriction that refers to a clause of a transfer or a separate deed by date. In the charges register, as a legal charge in favour of a former owner with no obvious loan behind it. And in the legal pack, as a transfer with a long schedule of covenants, a separate deed of overage, or a deed of covenant given by the current owner when they bought. The register entry never reproduces the terms, so the deed itself has to be in the room, and if it is not, asking for it is the first request to make.

02 How it binds you: the restriction, the charge and the deed of covenant

An obligation to pay money is a positive covenant, and on freehold land the burden of a positive covenant does not run to a successor. Left as a bare promise, overage would bind only the original buyer, and that buyer could sell the land free of it. So every competent overage deed carries machinery to pass the burden on, and reading an overage agreement is partly reading that machinery to see whether it still works.

The usual protection is a restriction on the proprietorship register. The common form says that no disposition of the registered estate, often with the words "other than a charge", is to be registered without a certificate from a conveyancer that the relevant clause of the deed has been complied with. The clause in question will say that the owner must not dispose of the land without first procuring a deed of covenant from the incoming owner, in favour of the beneficiary, promising to observe the overage. The effect is that on completion of your purchase your solicitor will have to certify that the deed has been given before HM Land Registry will register you as proprietor, and at that moment you are bound exactly as the seller was. The chain is only as strong as its last link: if a previous transfer went through without a deed of covenant, the position needs a solicitor's view on who is actually bound.

A legal charge is the other common device: the seller takes a charge over the land to secure the overage, so that a sale cannot complete without the charge being dealt with. A charge can secure a liability that has not yet fallen due, so it does the job, but it is a blunt instrument: it ranks ahead of any lender who comes later, which is where it most often becomes your problem rather than the seller's.

Other devices appear from time to time. A ransom strip retained around the site or across its access gives the seller a physical veto rather than a contractual one. A right of pre-emption or an option back lets the seller buy the land in before a disposal. A restrictive covenant not to develop without the seller's consent is sometimes used, though a restrictive covenant protects land rather than a payment and the courts have resisted attempts to use one as a collection mechanism. Whichever device is in play, the register entry is the signpost and the deed is the substance.

03 The trigger: grant, implementation, disposal or completion

The trigger event is the clause that decides whether overage is a theoretical burden or a cost on the critical path, and it is where the drafting positions of seller and buyer are furthest apart.

A trigger on the grant of planning permission is the seller's preference: it is certain and it is early. For the buyer it means money is due before anything has been built, let or financed, and before the permission has survived any challenge. A trigger on implementation of a permission is the buyer's preference, because the buyer decides when to start on site, and it leaves the seller exposed to a permission that is never used. A trigger on disposal with the benefit of a permission catches the trader who buys, obtains consent and sells on, and sellers like it for that reason; buyers who plan to hold and let will want to know precisely what counts as a disposal. Triggers on practical completion or change of use are used where the parties have a specific scheme in mind, and they get argued over when the scheme changes shape and the event the deed described never quite happens.

Then read the definitions, because the trigger is only as wide as the words behind it. Where a deed was triggered by "any detailed planning permission", a council was held entitled to overage on the approval of reserved matters under an outline consent. Where overage was payable on the grant of prior approval for a change of use under permitted development rights, it was held payable even though the units that prior approval covered could not lawfully be built. Where a developer built houses and let them rather than selling, to avoid a trigger on sale, the court implied a term requiring the houses to be sold within a reasonable time. The pattern in the cases is that a trigger will be read according to its words and that a party who tries to sidestep it by doing something the deed did not foresee tends to lose.

For a logistics buyer the practical test is to take your own programme, planning application, reserved matters, start on site, letting, forward funding, sale of the completed investment, and walk each step through the trigger clause and its definitions. Each step is either a trigger, an excluded disposal, or a question for your solicitor.

04 The sum: base value, enhanced value and what comes off

The payment is almost always a percentage of an uplift, and the uplift is the difference between two valuations defined in the deed. The base value is usually the price paid under the original sale, sometimes indexed, or the value of the land without the planning permission that triggered the payment. The enhanced value is the value with the benefit of the trigger event, assessed on assumptions the deed sets out. The percentage is negotiated and varies widely; there is no standard figure, and the right number for pricing a bid is the one in the deed in front of you.

Three things decide whether the formula is fair or a trap. The first is the valuation assumptions: whether the enhanced value is assessed with vacant possession, whether it is the value of the land or of the completed scheme, and what date it is taken at. The second is the list of deductions. A buyer-friendly deed allows the costs of obtaining the permission, section 106 and Community Infrastructure Levy payments, abnormal ground and infrastructure costs and sometimes a developer's return to come off the uplift before the percentage is applied; a seller-friendly deed allows nothing. The third is the dispute mechanism, normally an independent expert, and whether the deed says enough about the assumptions for an expert to decide. The reported cases on overage formulas are mostly cases about ambiguity: a formula that read two ways, a term that dropped out of a worked example, assumptions that were never stated. Those are expensive arguments to have after completion and cheap ones to spot before a bid.

Where the uplift formula references a value "with planning permission", check whether a permission already on the site has crystallised a payment that is still outstanding. An unpaid overage is a debt of the seller, but a restriction that has not been complied with is your registration problem.

05 How long it lasts

There is no statutory limit on an overage period in England and Wales. The term is negotiated and written into the deed, and it is usually measured from completion of the original sale rather than from any later event. Short terms of a few years are used where a planning application is expected straight away; terms of fifteen or twenty years are not unusual where the seller is protecting against a change of use that may be well in the future; longer terms exist. A deed with no stated period is a question for a solicitor rather than something to assume in either direction.

On a deed that is already some years old the useful number is the time remaining. An overage with three years left on a site where planning will take two is a different proposition from the same deed with eighteen years to run, and a bid timetable that can be managed to run the period out is worth something. Check too whether anything extends the period: some deeds restart it on a disposal or pause it during a planning appeal.

The rule against perpetuities, which limits how long certain future interests in land can be kept in suspense, is sometimes raised as a way out of a long overage. For instruments taking effect on or after 6 April 2010 the Perpetuities and Accumulations Act 2009 confines the rule to a defined list of interests, and the explanatory notes to the Act say it does not apply to options to purchase or rights of pre-emption; an older deed with an option or pre-emption back may still be subject to the old rule. Whether it touches a bare contractual promise to pay is not something to rely on either way without advice, which is one more reason the period should be stated in the deed.

06 Lender, release and pricing it into the bid

Three questions follow once the deed has been read against the scheme.

The first is the lender. Where the restriction on the title excludes a charge from its scope, a funder's charge can be registered without troubling the beneficiary, though the same restriction usually still catches a sale by that lender if it enforces, so a funder will often want a release or a side letter even then. Where the restriction has no carve-out, or where the overage is secured by the seller's own legal charge, the lender will want the overage released, postponed behind its security by a deed of priority, or carved out of the restriction before it will complete. That is a negotiation with the beneficiary, and a buyer who discovers the point after exchange is negotiating from a weak position. Raise it with the lender when the facility is being discussed, not when the drawdown conditions are being checked.

The second is release. There is no tribunal route for overage. The Upper Tribunal's power to discharge or modify a restrictive covenant under section 84 of the Law of Property Act 1925 is aimed at restrictions on the use of land, and it is not a way out of a promise to pay money; only where overage has been dressed up as a restrictive covenant does that route arise, and even then the compensation the tribunal awards can bear little relation to the overage value. A release is a commercial deal with the beneficiary. The price tends to track what the overage is blocking, so a beneficiary who can see your planning application coming is not a cheap counterparty. Where the beneficiary is a company that has been dissolved or an individual who cannot be found, the restriction can block registration as well as the deal, and the route out is procedural rather than commercial.

The third is the bid. Model the payment under the deed's own formula, on your own programme, with your own planning assumptions, and treat the result as a cost of the scheme. Where the scheme you are buying the site for is the trigger, the overage is in substance part of the price and belongs in the negotiation with the seller. Where it is unlikely to be triggered inside the remaining period, it is a note in the report. Where it cannot be modelled because the deed is ambiguous or the beneficiary is unknown, the honest position is a conditional offer.

07 Red flags to catch before you bid

Some findings should change the number. A restriction on the title with no deed behind it in the data room means an obligation nobody can price, and the deed has to be produced before the bid, not after. A disposal trigger with no excluded disposals, or with a definition of disposal that catches a lease, turns an investment business plan into a series of payments. A trigger on the grant of permission with no deferral of payment puts cash out before the scheme is funded.

Then the formula. No stated valuation assumptions or no deductions for planning and infrastructure costs means the percentage is applied to a gross figure the deed does not define. A permission already granted on the site may have crystallised a payment that is outstanding, which is the seller's debt but your registration problem. A legal charge securing the overage is a lender issue to resolve before funding. A period that has not been stated, or that restarts on each disposal, needs legal advice before it goes in the appraisal. And a beneficiary that cannot be traced is a procedural problem where the restriction calls for its consent, and a commercial one everywhere, because there is nobody to negotiate a release with.

None of these is unusual on development land, and none is fatal on its own. The job before a bid is to find the deed, run the scheme through it, and either price the result or make the offer conditional on a release.

08 Frequently asked questions

What is an overage agreement?

An overage agreement is a contract under which a buyer of land promises to pay the seller a further sum if the land later becomes more valuable in a stated way, most often because planning permission is granted or implemented, or because the land is sold on with the benefit of a permission. The seller uses it to share in value that did not exist at the date of sale. It is also called clawback, uplift or an anti-embarrassment clause. The payment is usually a percentage of the increase in value, calculated under a formula in the deed, and the obligation runs for a stated number of years. It is a contractual promise rather than a right in the land itself, which is why the deed will also contain machinery, normally a restriction on the title at HM Land Registry, to make sure the promise is passed on to anyone who buys the land next.

Does an overage agreement run with the land?

Not by itself. An obligation to pay money is a positive covenant, and on freehold land in England and Wales the burden of a positive covenant does not pass to a successor automatically. Overage is made to follow the land by other means. The usual one is a restriction on the proprietorship register which prevents any transfer being registered until the new owner has given the seller a deed of covenant promising to honour the overage. Others are a legal charge over the land, a ransom strip or a right of pre-emption retained by the seller, and occasionally a restrictive covenant against developing without consent. So in practice a well drafted overage does reach the next buyer, and the question for a bidder is which mechanism protects this one and whether it has been kept up.

How long can an overage clause last?

As long as the deed says. There is no statutory limit on the overage period in England and Wales, so the period is negotiated and written into the agreement. Short periods of a few years are used where the buyer is expected to apply for planning permission straight away; periods of fifteen or twenty years are not unusual where the seller is protecting against a change of use that may be some way off, and longer ones exist. The period usually runs from completion of the original sale, so on a deed that is already some years old the useful number is the time left, not the headline term. A deed with no stated period at all is a question for your solicitor, not something to assume away.

What triggers an overage payment?

Whatever the deed defines as a trigger event. The common ones are the grant of planning permission for a more valuable use, the implementation of that permission, a disposal of the land with the benefit of the permission, practical completion of a development, and a change of use. The choice matters a great deal. A trigger on grant means money is due before anything has been built or funded. A trigger on implementation or disposal lets the buyer decide when the payment falls due, which is why sellers resist it. Read the definitions as carefully as the trigger itself: the courts have held reserved matters approvals to count as a detailed planning permission, and a prior approval for permitted development to count as a planning trigger even though the scheme it approved could not lawfully be built.

Can an overage agreement be removed?

Only by agreement with whoever has the benefit of it, or by waiting for the overage period to expire. There is no tribunal route for overage of the kind that exists for restrictive covenants: the Upper Tribunal's power to discharge or modify a covenant under section 84 of the Law of Property Act 1925 is aimed at restrictions on the use of land, not at a promise to pay money. A release is a commercial negotiation, and a beneficiary who understands what the overage is worth will price it accordingly. Where the beneficiary cannot be traced, the restriction can still be a practical problem: under the usual form a conveyancer can certify that the deed of covenant has been given, but a restriction that calls for the beneficiary's own consent or signature needs an application to HM Land Registry to disapply it, and a dissolved company's rights pass to the Crown.

Can you get a mortgage on land with an overage clause?

Usually, but check the restriction. The standard form of restriction used for overage often excludes a charge from its scope, so a lender's charge can be registered without the beneficiary's certificate, though the restriction may still bite on a sale by the lender if it enforces, which is why funders often want a release or a side letter anyway. Where the restriction has no such carve-out, or where the overage is itself secured by a legal charge that ranks ahead of the lender, the lender will normally want the overage released, postponed behind its own charge, or carved out before it will fund. A buyer relying on development finance should raise the point with the lender before the bid, because a deed of priority or a release is a negotiation with the beneficiary and takes time.

Are overage clauses enforceable?

Yes, as contracts, and the reported cases show the courts reading triggers by their words and, occasionally, implying a term where the deed left an obvious gap. A developer who built houses and let them rather than selling, to avoid a trigger on sale, was held to be subject to an implied term requiring sale within a reasonable time. A developer who sold affordable units to a housing association, arguing that the sale fell within an exception for social or community purposes, was held to have broken its covenant not to dispose without a deed of covenant, and had to pay damages even though no overage had yet fallen due. Enforceability against a successor in title is a separate question and depends on the protection mechanism: where the restriction and deed of covenant chain has been kept up, the current owner is bound; where it has lapsed, the beneficiary may be left with a claim against an earlier owner only.

Does a lease or a sale of part trigger overage?

It depends on how the deed defines a disposal and what it excludes. A well drafted deed lists excluded disposals, typically a mortgage, a lease at a rack rent, a sale of a completed unit to an occupier, and dedications to the highway or statutory undertakers. A badly drafted one defines disposal as any transfer or lease, so that letting a completed warehouse to a tenant is a trigger. For an investor buying a logistics site to hold and let, the lease question is the single most important thing to settle in the deed, because the whole business plan is a series of disposals under a wide definition.

Should I buy land with an overage clause?

Often yes, if the number is right. Overage is common on development land and on sales by local authorities, which are under a duty to obtain the best consideration reasonably obtainable and use overage to protect against selling too cheaply. The question is not whether overage exists but whether the scheme being underwritten will trigger it, when, and for how much. Model the payment under the deed's own formula against your planning and disposal programme, and treat the result as a cost of the scheme in the appraisal. Where the overage would be triggered by the very thing you are buying the site to do, that is a price negotiation with the seller, not a reason to ignore the clause.

How much does it cost to deal with overage before a bid?

The legal work of reading the deed, checking the restriction and modelling the payment is part of the ordinary title review. The cost that matters is the overage itself, which can be a substantial share of the value the scheme creates, and the cost of any release, which is a commercial deal with no fixed scale. A buyer who needs a release or a deed of priority before funding should assume the negotiation will not fit inside a bid window, and either price the overage in full or make the offer conditional on the release being agreed.