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Viability Assessment Software: Replace Spreadsheet Appraisals

Replace spreadsheet drift with repeatable, structured viability modelling for UK residential development

The Spreadsheet Problem

Version Chaos

Multiple versions of the same appraisal across emails. Teams can't tell which numbers are current.

Formula Errors

Hidden errors in linked cells, broken formulas after file edits, inconsistent calculation logic.

Comparison Difficulty

Hard to compare scenarios, track assumption changes, or benchmark against past projects.

How Domus Structures Viability

Revenue Modelling

Structured unit schedules and GDV calculation

  • Unit type library: Define houses, apartments, commercial units with consistent specification
  • Sales phasing: Model multi-phase schemes with realistic absorption rates
  • Price escalation: Apply realistic price growth over build-out period
  • Rental income: Layer in BTL, commercial rent, ground rent for mixed-use schemes

Cost Framework

RICS-aligned cost structure and benchmarks

  • Build cost inputs: £/sqm rates, site-specific abnormals, externals
  • Professional fees: Architect, structural, planning, legal fees as %
  • CIL & S106: Community infrastructure levy and planning obligation costs
  • Finance costs: Interest on debt, arrangement fees, monitoring fees
  • Contingencies: Construction, planning risk allowances

Returns Analysis

Profit, RLV, and viability metrics

  • Residual land value: Calculate maximum supportable land price given target returns
  • Profit on GDV: Show developer return as % of gross development value
  • Profit on cost: Alternative profit metric on total development cost
  • IRR & NPV: Time-weighted returns for phased schemes with discounted cash flow

Compare Scenarios Instantly

Test different unit mixes, phasing strategies, or cost assumptions side-by-side. See how changes impact land value, profit, and project viability without rebuilding spreadsheets.

Scenario A: More Houses

12 houses, 8 apartments → Higher sales values, slower build

Scenario B: More Apartments

6 houses, 16 apartments → Faster build, lower £/unit

Each scenario shares core site data but tests different design approaches. Teams make informed decisions backed by consistent financial modelling.

Sensitivity Testing

Understand how viability responds to changes in key variables

Build Cost Risk

Test ±10% build cost variance to see impact on land value and developer profit

Sales Value Pressure

Model market downturn scenarios with reduced sales rates or extended absorption

Finance Cost Changes

See viability impact of interest rate movements or extended build programs

Used Across Development Scenarios

Portfolio Rehabilitation

Model multiple sites across your portfolio with consistent viability assumptions.

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Build-to-Rent Development

Calculate viability through rental appraisal and long-term hold analysis.

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Mixed-Use Development

Model multi-component projects with residential, retail, and office components.

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Densification & Infill

Assess viability of density improvements and infill opportunities with complex constraints.

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See Viability Modelling in Action

Book a demo to see how Domus replaces spreadsheet appraisals