Development Guide
Property Development UK
From site sourcing to exit strategy. Learn how to appraise development opportunities, navigate planning, manage construction, and maximise your profit.
What Is Property Development?
Property development involves acquiring land or property, adding value through construction, conversion, or refurbishment, and either selling for profit or retaining for rental income. It is the most capital-intensive property strategy but can offer the highest returns — typically 15-30% profit on cost for successful projects.
Development Appraisal
Before committing to any development, you must complete a thorough financial appraisal. The key calculation is:
Profit = GDV − (Land + Build Costs + Finance + Fees + Contingency)
Gross Development Value (GDV): The total market value of the completed development. For residential, calculate using comparable sold prices per square foot. For example, 4 houses at £250,000 each = £1,000,000 GDV.
Build Costs: Typically £1,200-2,500 per square foot depending on specification, location, and build type. New build is generally £1,500-2,000/sqft, conversions £1,000-1,800/sqft. Always get quantity surveyor estimates.
Development Finance: Typically 55-65% of GDV, released in stages. Interest rates of 6-12% plus arrangement fees of 1-2%. Factor in holding costs during the build period.
Professional Fees: Architect (5-7% of build costs), structural engineer, planning consultant, building regulations, CDM coordinator, warranties (NHBC/Premier Guarantee), sales agent fees (1-2% of GDV).
Contingency: Always include a 10-15% contingency on build costs. Unexpected issues with foundations, drainage, contamination, or materials are common.
Types of Development
Ground-Up New Build
Building from scratch on land. Highest cost and risk but maximum control over design and specification. Requires full planning permission.
Conversion
Converting commercial buildings to residential under Permitted Development (Class MA) or full planning. Offices, barns, pubs, and churches are common conversion targets.
Subdivision
Splitting larger properties into multiple units. Converting a large house into flats or subdividing plots for additional dwellings.
Extension & Refurbishment
Adding value through extensions, loft conversions, or major refurbishment. Lower risk entry point into development with smaller capital requirements.
Planning Permission
Planning is the single biggest risk in property development. Land without planning permission is worth a fraction of land with planning consent. Understanding the planning system is essential.
Pre-application advice: Most local planning authorities offer a pre-application service (£200-2,000) where a planning officer reviews your proposals informally before you submit. This is highly recommended and can save thousands in abortive costs.
Outline Planning: Establishes the principle of development. Typically used for larger sites where detailed plans will follow. Reserved matters (layout, scale, appearance, access, landscaping) are agreed separately.
Full Planning: Detailed application covering everything. Typically determined within 8 weeks (minor) or 13 weeks (major). Include a Design and Access Statement, environmental assessments, and supporting reports.