Development Feasibility Report — What It Covers and What It Costs

Understanding the Scope of a Development Feasibility Report

A development feasibility report acts as a structured evaluation of all the factors that affect whether your proposed development is financially and operationally viable. A thorough report covers:

Site analysis: Physical characteristics of the site, including topography, access, and environmental constraints
Planning review: Current designations, planning history, prospects for consent, and likely conditions
Market analysis: Comparable evidence, demand assessment, achievable values or rents
Financial feasibility: Detailed cost plan, revenue projections, residual land value or projected profit, sensitivity analysis
Risk assessment: Key project risks and their likely cost impact, with mitigation options

The report is most valuable at the point of land acquisition — before you have committed to a purchase price. It tells you what the land is worth given your proposed scheme, and therefore what you should (and should not) pay.

Site Analysis: Ground Zero of Your Project

The site analysis section evaluates the physical attributes of the site that will influence construction costs and programme. Key areas include:

Ground conditions: Bearing capacity, contamination risk, groundwater level, proximity to water courses. A contaminated site may require remediation costing £50,000–£500,000+ depending on the contaminant type and extent.
Topography: Sloped sites require retaining walls, extensive earthworks, or engineered foundations. In the UK, a materially sloped 0.5-acre site can add £100,000–£300,000 to groundworks costs over a level equivalent.
Access: Vehicular access adequacy, highway adoption requirements, and any requirements for junction improvements or visibility splays.
Services: Location and capacity of utilities connections — gas, electricity, water, drainage. Off-mains drainage in rural areas can add £30,000–£80,000 to project cost.
Environmental constraints: Flood zone, SSSI, protected species, tree preservation orders, and any conservation area or heritage designations affecting what can be built and at what cost.

Planning Permission: Navigating UK Regulations

The planning section of a feasibility report assesses the realistic prospects of obtaining planning consent for the proposed development, and the likely conditions that consent will carry.

Key planning cost considerations for 2026:

Planning application fees: Revised fees took effect in December 2023. Residential development fees are now approximately £578 per dwelling for major applications (10+ units). A 30-unit scheme would pay approximately £17,340 in application fees alone.
Planning consultancy: Engaging a planning consultant to prepare and manage a residential application typically costs £8,000–£25,000 depending on scheme size and complexity.
Supporting reports: Most planning applications for residential development require transport assessments, ecology surveys, heritage assessments (where relevant), and flood risk assessments. Budget £15,000–£50,000 for a comprehensive supporting documents package.
Section 106 obligations and CIL: Affordable housing contributions and community infrastructure levy can materially affect scheme viability. The feasibility report must model these obligations against the project’s financial position.

Market Analysis: Aligning Development with Demand

A robust market analysis ensures your development proposals are grounded in what the local market will actually support. Key components:

Comparable sales analysis: Recent transactions of similar properties within a defined search area, used to support value assumptions in the financial model
Pricing trends: Direction of travel in the local market — particularly relevant in markets that have seen rapid value movements since 2020
Demand assessment: Housing need analysis drawing on local authority data, office for national statistics projections, and local estate agent intelligence
Competitor pipeline: Other schemes with planning permission or under construction that may compete for the same buyers and affect absorption rates and pricing

Financial Feasibility: The Residual Appraisal

The financial section is the core of the development feasibility report. It constructs a residual land value appraisal — comparing gross development value (GDV) against total development cost (TDC) to determine whether the scheme generates a sufficient return on development risk.

Key inputs and 2026 benchmarks:

Construction costs: £2,000–£3,500 per m² for residential schemes depending on location and specification. Add 15–25% for professional fees, contingency, and finance.
Finance costs: Development finance in 2026 typically costs 6–9% per annum (base rate dependent). Finance cost is often 8–12% of total development cost on a typical residential scheme.
Developer profit: Lenders typically require a minimum 17.5–20% return on GDV. The residual appraisal must demonstrate this return is achievable.
Affordable housing: Where planning policy requires affordable units (typically 25–40% of scheme), these are modelled at a discount to open market value (typically 50–70% of OMV for registered provider sales).

Risk Assessment and Sensitivity Analysis

No development feasibility is complete without a risk assessment that quantifies the key variables and tests the scheme’s resilience to adverse outcomes. Standard sensitivity tests include:

Construction cost overrun of 10% and 20%
Sales value reduction of 5% and 10%
Sales programme extended by 6 months and 12 months
Finance cost increase

A scheme that is viable at base case but immediately unviable if construction costs increase by 10% carries significant risk. A robust scheme maintains viability under most stress scenarios — and the feasibility report should clearly articulate the threshold at which viability breaks down.

What Does a Development Feasibility Report Cost?

Fees for a development feasibility report in the UK in 2026:

Small residential scheme (5–15 units), straightforward site: £5,000–£12,000
Medium scheme (15–50 units) or mixed-use: £10,000–£25,000
Large scheme (50+ units) or complex site: £20,000–£50,000+
Commercial development feasibility: £8,000–£30,000 depending on size and complexity

These fees are modest relative to the capital at risk. A £12,000 feasibility report on a 20-unit scheme with a GDV of £5 million that identifies a fundamental viability problem — before the land is purchased — saves the developer from a potentially catastrophic financial commitment.

Frequently Asked Questions

Do I need a development feasibility report before buying land?

Not as a legal requirement — but as a practical necessity if you are spending significant money on a development site, yes. The feasibility report tells you what the land is worth given your proposed scheme. Without it, you are making a six or seven-figure land purchase without knowing whether the development will actually be profitable.

Who should prepare a development feasibility report?

The financial modelling and cost planning elements should be led by a qualified quantity surveyor or development appraiser. Planning input should come from a chartered town planner. For sites with environmental or ground condition issues, specialist technical consultants may contribute to the report. A QS firm with development appraisal experience can typically coordinate the whole exercise.

Can a development feasibility report be used to secure finance?

Yes — a well-structured feasibility report demonstrating scheme viability is a standard component of development finance applications. Most lenders will require it as part of the credit approval process. Ensure the report uses current cost benchmarks and that its assumptions are clearly documented and defensible.

What is the difference between a feasibility report and a viability assessment?

A viability assessment is typically a planning document — specifically, an assessment submitted to a local planning authority to demonstrate that a scheme cannot viably support the full level of affordable housing or CIL contribution required by policy. A feasibility report is a broader internal document used by developers to evaluate scheme viability before and during the development process. The methodologies are closely related but the audience and purpose differ.