28 Apr Essential legal due diligence before acquiring a development site
Thorough legal due diligence is the most important step a developer can take before committing to the purchase of a site. Identifying risks early protects the viability of the project, prevents delays, and ensures that any agreement for sale, option, promotion, or joint venture is structured on a sound legal foundation.
While every site is different, the principles of rigorous due diligence remain the same across residential, commercial, and mixed-use development.
Understanding the legal title and property boundaries
Investigating the legal title is an important first step of due diligence. It clearly defines what you own, what access you have, and what you can build.
This includes verifying the accuracy of the boundaries, identifying any easements, covenants, or restrictions, and assessing the impact of rights of way or third-party interests.
These issues can influence everything from access arrangements to layout design, density, and the ability to implement planning permission.
Early clarity on title matters avoids surprises that might otherwise halt or reshape a proposed scheme. Developers must specifically check for Overage provisions on the existing title, which could require paying a percentage of future profit to a previous owner.
Reviewing the planning position
Before acquiring any development land, developers should form a clear understanding of the planning context. This includes reviewing the local plan, existing permissions, historic refusals, planning policy constraints, and any relevant designations such as conservation areas or protected landscapes.
It is equally important to assess potential liabilities under the Community Infrastructure Levy (CIL) and determine whether any Section 106 obligations could affect viability, phasing, or delivery. Careful planning due diligence allows developers to anticipate obstacles and align their strategy with local policy priorities. We also check for any outstanding Section 278 agreements (relating to highway works) that may impose unforeseen liabilities.
Searches, surveys, and site-specific risk
Comprehensive searches and enquiries are essential to uncover environmental, physical, and legal risks that may not be immediately visible. Environmental and contamination reports, flood-risk data, utility plans, access assessments, and drainage information all help build a full picture of the site.
These investigations can reveal issues such as contamination, inadequate access, underground constraints, or drainage limitations, any of which could require remediation, redesign, or negotiation before contracts are exchanged.
Developers should always instruct a Phase 1 desk study as a minimum requirement for contamination risk assessment. It is the initial stage of a site investigation carried out before development or property acquisition, particularly where contamination is suspected or planning conditions require it. It will help to determine whether the site is suitable for the proposed use or whether an intrusive investigation (Phase 2 Site Investigation) involving soil and water sampling is required.
Avoiding ransom strip complications
Ransom strips are small parcels of land in third-party ownership that control access or service routes and can sometimes delay or even prevent the delivery of a development.
As part of due diligence, developers should confirm that no such strips exist at the site boundaries or along proposed access or service corridors.
Where a potential ransom is identified early, it is often possible to negotiate terms or adjust the scheme. Discovering a ransom strip after acquisition, however, can mean costly negotiations and design revisions.
Getting the commercial terms right
Before drafting any binding agreement, clear and comprehensive Heads of Terms should be agreed between the parties. This ensures that commercial objectives are aligned and prevents disputes later in the process.
Heads of Terms typically set out the structure of the deal, conditionality, timescales, overage or uplift provisions, access rights for surveys, and responsibilities for planning promotion. Developers benefit from addressing these points upfront, rather than renegotiating them after legal drafting has begun.
Funding and lender considerations
If a site is likely to require external funding, it is important to ensure that the acquisition structure and the terms of any agreement will be acceptable to lenders. Some development agreements include clauses or obligations that lenders may resist, such as early termination rights for the seller.
Establishing funder requirements at the outset helps to avoid delays at exchange or completion and ensures that the proposed deal is financeable on realistic terms.
Why early due diligence protects your development
Comprehensive due diligence provides developers with confidence, clarity, and control. When risks are identified early, they can be managed proactively, through negotiation, redesign, conditionality, or adjusted pricing.
By contrast, issues discovered after exchange can jeopardise programming, funding, and profitability.
A well-informed acquisition not only strengthens a developer’s negotiating position but also ensures that the subsequent legal agreements, whether an option, conditional contract, promotion agreement, or joint venture, are drafted around known constraints, rather than hidden risks.
For more information
- Commercial property legal services
- Commercial property development legal services
- Option, Promotion and Overage agreements explained
- Video – Are you taking on a commercial property and want to avoid costly legal risks?
For legal advice
- Email info@hrjforemanlaws.co.uk
- Call Hitchin, 01462 458711, Welwyn Garden City, 01707 887700, Old Harlow 01279 709 100.
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