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Sustainability & Delivery CIRIA C753 §35 · Green Book

SuDS Lifecycle Costing Calculator

Whole-life capex, opex and renewal costs for SuDS components, discounted to present value.

Project Parameters

Define your development scope and financial assumptions

Project Information

Name or reference of the development
Typical: 25-30yr for residential, 40-60yr for strategic assets
HM Treasury Green Book default: 3.5%. Defra guidance for long-term assets: 2%
Regional cost adjustment factors

Capital Costs

Add SuDS components and their costs

Component Type Quantity Unit Unit Cost (£) Component Total (£) Action

Site Total Capital Cost

£0
Before regional adjustment

Annual O&M Costs

Operating and maintenance costs based on components

Info: O&M costs are auto-populated based on your components. Edit values below to reflect site-specific management arrangements.
Inflation rate for maintenance costs. Typical: 2-3% per year. Use 0% for constant costs.
Component Type Quantity Unit Cost/Year (£) Annual Cost (£)

Total Annual O&M

£0

O&M per Dwelling

£0

O&M as % of Capital

0%

NPV & Commuted Sum

Whole-life cost analysis and adoption calculations

NPV Factor

0.00
Based on discount rate and design life

Capital Cost (with regional adj.)

£0

PV of O&M (30yr)

£0

Whole-Life NPV

£0
Capital + PV of O&M over design life

Replacement Costs (for assets with shorter life)

Component Replacement Year Cost (£)

Commuted Sum (for Adoption)

Annual O&M × NPV Factor

£0

Commuted Sum (+ 15% admin)

£0

Cost per Dwelling

£0

Cost per m² Development

£0

Industry Benchmarks

Typical SuDS cost range: £2,000-£8,000 per dwelling for full SuDS provision

Your project benchmark: -

Results & Export

Summary and PDF generation

Project Summary

Development: -

Design Life: - years

Adoption Pathway: -

Whole-Life Cost Summary:

Capital Cost (adjusted) £0
PV of Annual O&M £0
Total Whole-Life NPV £0

Commuted Sum (Adoption):

Annual O&M × NPV Factor £0
15% Administration Uplift £0
Commuted Sum £0

Unit Costs:

Per Dwelling (if applicable) -
Per m² of Development -

Generate a comprehensive PDF report with all calculations, charts, and analysis

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