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Conditional Contracts v Option Agreements: Which is right for you?

Mar 2026
Agriculture & Rural
7 MINS

Conditional Contracts v Option Agreements: Which is right for you?

Sophie Fletcher, Agriculture & Rural

Development land is in high demand. The Government’s target to build 1.5 million new homes during this Parliament is increasing demand for development land across the country. For farmers and landowners, this may present significant opportunity but also complexity.

If a developer approaches you about purchasing land for development, the structure of the agreement you enter into can have a major impact on the level of control you retain, the certainty you achieve, and ultimately the value realised.

Two of the most common arrangements are Conditional Contracts and Option Agreements. Understanding the differences between them is essential before committing to either.

Why early advice matters
Before entering into negotiations, it is crucial to instruct an experienced Land Agent with specific expertise in development transactions. A Land Agent or Surveyor will negotiate commercial terms with the developer, while your solicitor ensures the legal documentation properly protects your position.

The structure agreed at the outset can significantly affect:

  • The length of time your land is tied up
  • Whether you retain any ongoing use of the land
  • Who controls the planning process
  • The level of certainty you have that a sale will proceed

What is a Conditional Contract?
A Conditional Contract is a legally binding agreement for the sale of land, where completion is dependent on a specified condition being satisfied.

The most common condition is the grant of satisfactory planning permission.

Key features:

  • The contract is binding from the outset.
  • Completion takes place automatically once the condition is satisfied.
  • Both parties are legally obliged to proceed once the condition is met.
  • A Long Stop Date is usually included to prevent the contract from continuing indefinitely.

If the condition is not satisfied by the long stop date, for example, if planning permission is refused and no successful appeal is made, the contract will typically fall away.

Conditional Contracts are generally used where there is reasonable confidence that planning permission can be obtained within a defined timeframe.

What is an Option Agreement?
An Option Agreement gives a developer the right, but not the obligation, to purchase your land within a specified period (known as the Option Period).

The developer may choose whether to exercise the option once planning and other due diligence work has been completed.

During the Option Period, the developer will usually:
• Apply for planning permission
• Undertake surveys and site investigations
• Liaise with utility providers and highway authorities
• Assess the commercial viability of the development

Option periods often range between 5 and 10 years, although this can vary.

If the developer decides not to exercise the option, for example, if planning permission is refused or infrastructure costs are too high, the agreement will expire and no sale takes place.

Conditional Contract v Option Agreement: Key differences
Conditional Contract:

  • Binding agreement from the outset
  • Greater certainty for landowner once condition satisfied
  • Typically shorter timeframe
  • Sale proceeds automatically once condition met
  • More commitment on both sides

Option Agreement:

  • Developer has discretion whether to proceed
  • Greater flexibility for developer
  • Often longer tie-in period
  • Sale only proceeds if developer exercises option
  • Less certainty for landowner

What should landowners consider?
The right structure will depend on your individual circumstances, objectives and appetite for risk. Key issues to consider include:

  1. Certainty v flexibility: Do you want greater certainty that a sale will proceed once planning is achieved? Or are you prepared for the possibility that a developer may walk away?

  2. Length of tie-in: How long are you prepared for your land to be tied up? Option Agreements can restrict your ability to deal with the land for many years.

  3. Ongoing use of the land: Can you continue grazing livestock or growing crops during the agreement period? The documentation must clearly address occupation and access arrangements.

  4. Control of the planning process: Who prepares and submits the planning application? Who controls appeals? These provisions can significantly affect outcomes.

  5. Price mechanism: Is the purchase price fixed, or calculated by reference to market value once planning is granted? Is there provision for overage or uplift?

  6. Risk allocation: What happens if planning permission is refused? Who bears the cost of the application and any appeals?

These commercial and legal details are just as important as the headline structure of the agreement.

Which is right for you?
There is no universal “best” option.

A Conditional Contract may provide greater certainty where planning prospects are strong and timescales are clear.

An Option Agreement may be more appropriate when planning is complex or subject to significant external factors.

The most suitable arrangement will depend on your long-term objectives for the land and your wider farming or estate strategy.

Speak to our Rural Property Team
If a developer has approached you, or you are considering promoting land for development, early professional advice is essential.

The Rural Property Team at Hay & Kilner regularly advises landowners on Conditional Contracts and Option Agreements for prospective development.

For further information or to discuss your circumstances, please get in touch with a member of our team.

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