Domestic House Extension — Residential, Birmingham
Single-dwelling residential extension in Birmingham. Cost planning at design stage, contract administration during construction, and payment certificate issue against measured progress. Demonstrated that private homeowners can access the same commercial rigour usually reserved for commercial schemes — cost transparency, change control, certified payments. Outcome: Delivered on programme with cost certainty maintained throughout.
Project Value
£175k
Duration
35 weeks
Project Scope
Cost certainty maintained
Client:
single-dwelling extension
Location
Birmingham
Sector
Residential
Completion
January 2026
The Challenge
A single homeowner extension run with full commercial discipline — costed at design stage, administered through construction, and paid against measured progress rather than estimates.
Bringing commercial-grade cost control to a private domestic project usually run without a QS
Maintaining cost certainty across a 35-week programme as the works progressed
Issuing payment certificates against measured progress, with clear change control throughout
Our Approach
01
Design-Stage Cost Planning
Full cost plan prepared at design stage to set clear commercial parameters before construction began.
02
Contract Administration
Contract administered throughout construction, with change controlled and documented as the works developed.
03
Certified Payments Against Progress
Payment certificates issued against measured progress, keeping payments aligned to work actually completed.
Key Performance Metrics
35
Weeks, delivered on programme
£175k
Final account, cost certainty maintained
100%
Payments certified against measured progress
Technology & Tools
Xero
Finance and cost tracking
Measured valuations
Payment certificates against progress
Design-stage cost plan
Budget set before construction
Cost planned at design stage and administered through construction, with payment certificates issued against measured progress.