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Budget or design: which comes first?
Should we do this project? · Episode 19
George Charalambous with Tina Patel
A design you love, a price you cannot afford—and a painful journey back. How do you avoid getting that far before the numbers catch up?
Building surveyor George Charalambous joins Tina to explain how budget and design can develop together, with useful cost checks before choices become expensive to undo.
The cost plan went in a drawer. Then came the tender bomb.
George recalls a church conversion into a nursery where the design kept growing after the cost plan was prepared. By the time the prices arrived, the team had to find substantial savings.
The difficult part was preserving the ideas that gave the scheme its identity. Cutting a finished design back is a different conversation from exploring affordable options at the beginning.
The lesson applies to homes too: revisit the cost plan as the scope changes. An early estimate helps only while it still describes the project you intend to build.
01
Set the range
Say what you can spend.
02
Test the scope
Explore affordable options.
03
Revisit the numbers
Cost the developing design.
04
Decide in time
Check access and lead times.
Set a spending range, then test what it can achieve
George’s answer is budget first—but only just. The homeowner’s comfortable spending range sets the initial boundaries; early design work then tests what is feasible within them.
Tina distinguishes exploring a brief from developing a complete scheme without cost checks. Looking at options together leaves room to change direction before fees and emotional commitment make it harder.
Start with the outcome you need, the money available and the choices that matter most. Ask your designer and cost adviser to test those together, rather than letting either budget or design run ahead alone.
A sketch and a price per square metre can miss the hard work
A builder’s first look may not reveal the structure needed to support an extension or remodel an existing house. Access, foundations and the sequence of construction can change the picture.
The conversation also brings in professional fees, investigations, planning requirements and party-wall matters. These sit around the building work but still draw on the money available for the project.
Ask what an early estimate includes, what it assumes and what remains unknown. Use it to guide the next investigation, rather than treating a broad number as a promise.
The bathroom choice can change more than the bathroom bill
Tina describes large-format bathroom materials whose installation involves lifting equipment, removing windows or arranging access from the road. The product price tells only part of that story.
George adds the risk of long lead times and late decisions. A missing item can extend scaffolding hire, security and other site costs even when little visible work is happening.
Keep the design team talking, agree when information is needed and check delivery requirements before committing. Timely choices protect both the programme and the budget.
Three decisions to take into your project
01 Bring budget and design together.
Agree an initial spending range, then test and refine it alongside the brief.
02 Keep the cost plan current.
Review scope changes and hidden costs before they become a tender surprise.
03 Give decisions a deadline.
Make choices early enough for design, ordering and delivery to stay aligned.
The full conversation
Chartered building surveyor George Charalambous of Thomas & Thomas joins architect Tina Patel to discuss budget, brief and design at the start of a home project. Tina hosts this episode.
The full conversation covers early cost planning, structural uncertainty, consultant appointments, party-wall costs, contractor prices and decision timing. It asks how the team can keep the project coherent from the first idea through to tender.
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Explore a related episode
Episode 6: Is your budget keeping up with your design?
Build a practical approach to keeping the budget current.
Episode 22: What is your structure asking you to spend?
See how structural choices change both the design and its cost.
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