Overage clauses exist because planning permission in England and Wales creates substantial value uplift — often multiples of the agricultural or existing use value of land. Where a vendor sells land at current use value (without the benefit of planning permission), they effectively gift any future planning gain to the buyer. An overage clause allows the vendor to participate in that planning gain if it arises within the overage period, without requiring the vendor to speculate on when (or whether) planning permission will be granted.
For landlords and property investors, the most common encounter with overage is as a buyer — discovering that the property purchased is subject to an existing overage obligation that will be triggered if planning permission is obtained for development or conversion. Understanding the overage structure is essential before incurring planning costs, because the overage payment (which can be substantial) will reduce the net return from any development.
Structure of an overage clause — trigger events, periods, shares and uplift calculation
The four key elements of any overage clause are the trigger event, the overage period, the seller's share, and the method of calculating the uplift:
- Trigger event — what crystallises the overage payment: The trigger event is the event that causes the overage payment to become due. The most common trigger events are: (a) Grant of planning permission — the overage is triggered when planning permission is granted for development on the land. This is a clean, objective event — the date of the planning decision notice. However, it means the overage is payable even if the buyer chooses not to proceed with the development and the planning permission lapses; (b) Commencement of development — the overage is only triggered when development actually commences on site (the laying of foundations; the commencement of structural works). This is more buyer-friendly than the grant of planning permission because the buyer has more control; (c) Sale of the developed land — the overage is only triggered when the buyer sells the developed site. This is the most buyer-friendly trigger but means the vendor has to wait for the buyer to sell; (d) Multiple events — some overage clauses contain multiple trigger events (e.g., any of the above that first occurs). The choice of trigger event is highly negotiated — sellers prefer the grant of planning permission; buyers prefer commencement or sale. For landlords who have purchased a property subject to an overage clause, the trigger event is the critical term to understand: if the trigger is the grant of planning permission, you should obtain legal advice before submitting a planning application — the moment planning permission is granted, the overage payment will be due
- Overage period — how long the obligation lasts: The overage period is the period from completion of the sale during which the trigger event must occur for the overage to be payable. Common overage periods are 10, 15, 20, 25, or 40 years. After the overage period expires, the obligation falls away and the land is free of the overage. For landlords who own land subject to an existing overage, always check when the overage period expires — once the period has passed (and no trigger event has occurred), the overage obligation falls away. Note: where the overage obligation is registered at the Land Registry as a restriction, the restriction will remain on the register even after the overage period expires — the buyer or their solicitor must apply to HMLR for removal of the restriction once the period has expired
- Seller's share and uplift calculation — the most contested element: The seller's overage share is typically expressed as a percentage of the net development uplift — the increase in value attributable to the planning permission or development. Common shares are 20%, 25%, or 30% of the net uplift. The uplift is calculated as: (a) Market value of the property with the benefit of the planning permission (at the date of the trigger event) MINUS (b) Market value of the property as sold (at the date of the original sale — not the trigger event date). The difference is the gross uplift. From the gross uplift, the buyer may be entitled to deduct: planning costs (architect and consultant fees; planning application fees; planning obligations/CIL payments); sometimes finance costs; sometimes a notional profit margin. The deductions are heavily negotiated — sellers want minimal deductions; buyers want maximum deductions. The net uplift (after agreed deductions) is then multiplied by the seller's percentage share to produce the overage payment. Disputes about the valuation of 'market value with planning permission' and 'market value as sold' are the most common source of overage disputes — the parties' independent surveyors often reach significantly different figures. Most overage clauses provide for RICS expert determination of the valuation dispute (binding; faster; cheaper than court proceedings)
Registering overage at the Land Registry, practical implications for landlords and option agreements
The enforceability of an overage against successor purchasers, and its interaction with development planning, are the key practical issues for landlords:
- Registration at the Land Registry — making overage bind successor purchasers: An overage clause in the original sale contract is merely a contractual obligation between the original buyer and the original seller. If the buyer subsequently sells the land to a third party without disclosing or procuring compliance with the overage, the third-party purchaser (who is not party to the original contract) is generally NOT bound by the overage obligation — the original seller can only sue the original buyer for breach of contract (not the third-party purchaser for the overage payment itself). To make the overage obligation run with the land and bind all future purchasers, the seller must protect the overage at the Land Registry. This is done by: (a) a restriction on the Proprietorship Register of the buyer's title (e.g., 'No disposition of the registered estate is to be registered without a certificate signed by [seller's name] or their solicitor that the provisions of the Overage Agreement dated [date] have been complied with'). The restriction prevents any future buyer from being registered as the new owner without complying with the overage. It does not give the seller a charge over the land (so does not create a secured debt), but does ensure that any future buyer is made aware of the overage and cannot complete without the seller's confirmation; (b) alternatively, the seller can take a legal charge over the land as security for the overage payment — this creates a secured debt and allows the seller to appoint a receiver if the overage payment is not made on crystallisation. Legal charges are less common for overage than restrictions. For landlords as buyers: check the Proprietorship Register of any land you are purchasing for restrictions that indicate an overage obligation — your solicitor should flag this in the title report. For landlords as sellers: always ensure the overage obligation is properly protected by a restriction at HMLR before or at completion of the sale — without registration, the overage is unenforceable against successor purchasers
- Practical implications for landlords subject to existing overage obligations: (a) Before submitting a planning application on land subject to an overage clause, calculate the likely overage payment. If the trigger is the grant of planning permission, the payment will be due immediately on the grant — before any development proceeds and before any revenue is received. Ensure you have the cash to meet the overage payment before committing to planning costs; (b) Read the overage agreement carefully: what is the trigger event? What deductions are allowed? What is the calculation mechanism? How is the valuation dispute resolved? When does the overage period expire?; (c) Consider whether the overage payment can be funded from development finance — some specialist development lenders will factor in the overage payment as a development cost; (d) Note that overage payments are a form of consideration for the original purchase of the land — they are added to the original purchase price as additional consideration for SDLT purposes. If the trigger event occurs and the overage payment is made, the buyer must submit an SDLT return and pay additional SDLT on the overage payment within 14 days of the overage payment becoming due
- Option agreements as an alternative to overage: Where a developer (or landlord intending to develop) believes a site has planning potential but does not want to pay the full market value before planning permission is obtained, an option agreement may be preferred over buying the land subject to an overage clause. Under an option agreement: (a) the developer (option holder) pays a modest option fee (typically £1,000-£50,000) for the right to purchase the site within a specified option period (typically 2-5 years); (b) the developer exercises the option if and when planning permission is obtained; (c) the purchase price under the option is usually a percentage of the market value with planning permission (e.g., 80% of GDV, or an agreed formula); (d) if planning permission is not obtained within the option period, the option lapses — the developer has lost the option fee but has not committed to purchasing the land. Option agreements are registered at HMLR as a notice on the vendor's title — this protects the developer's right to exercise the option against successor purchasers of the land. Option agreements are cleaner for both parties than overage clauses: the developer controls the timing and does not pay until planning permission is secured; the vendor has certainty that if planning permission is obtained, the sale will proceed at the agreed formula price. The vendor gives up the possibility of a higher uplift share (which overage would provide) in exchange for certainty of sale on exercise of the option
Frequently asked questions
What is the difference between an overage clause and a restrictive covenant?+
An overage clause entitles the seller to a share of future planning uplift — it is a positive obligation on the buyer to make a payment if a trigger event occurs. A restrictive covenant restricts what the buyer can do with the land (e.g., no development; no commercial use). Both can be registered at the Land Registry to bind future owners — overage via a restriction on the Proprietorship Register; restrictive covenants via an entry on the Charges Register. The key difference: overage creates a payment obligation if the buyer develops; a restrictive covenant prevents development altogether (unless modified or discharged).
If I buy land subject to an overage clause, do I have to pay the overage even if planning permission is later refused?+
It depends on the trigger event in the overage clause. If the trigger is the grant of planning permission, you only pay if planning permission is actually granted — a refused application does not trigger the payment. However, if you incur planning costs (architect fees; planning fees; consultant fees) and planning permission is then refused, you have borne those costs without triggering the overage — but you still owe nothing. Check the overage clause carefully: some clauses trigger on the submission of a planning application (not just the grant) — this is an unusual but buyer-unfriendly formulation.
Can I sell land that is subject to an overage clause without paying the overage?+
If the overage is protected by a restriction at the Land Registry, you generally cannot sell without the original vendor's written confirmation that the overage has been complied with. If the trigger event has not occurred (because no planning permission has been obtained), the vendor will typically provide written consent to the sale on the condition that the new buyer enters into a deed of covenant with the original vendor acknowledging the overage obligation — so the obligation passes to the new buyer. Take specialist legal advice before any sale of land subject to an overage clause.
Is the overage payment subject to tax?+
Yes. For the seller: overage receipts are taxable as income or capital depending on whether the seller is a trader (developer) or a capital investor. For individual capital investors, the overage payment received is subject to CGT (in the tax year it is received). For the buyer: overage payments are additional consideration for the original purchase — they are added to the purchase price for SDLT purposes and an additional SDLT return must be filed within 14 days of the payment becoming due. Overage payments are also deductible as a cost of acquisition for the buyer's own CGT calculation when they eventually sell the developed land. Take specialist tax advice on the tax treatment of overage payments.
- Restrictive covenants — use restrictions and modification via LPA 1925 s.84 →
- Land Registry title — proprietorship register, charges register and restrictions →
- Property search due diligence — checking for overage and other encumbrances →
- Capital gains tax — rates, exemptions and development land disposal →
- SDLT — rates, surcharges and additional consideration on deferred payments →
- Permitted development rights — development without full planning permission →