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Is your budget keeping up with your design?
Foundation Series · Episode 6 of 12
Tina Patel & Bart Kolosowski · 5 February 2026
An early price can sound reassuringly precise while the design behind it is still vague.
Bart and Tina follow the budget from the first feasibility conversation through design, tendering and construction—and explain how to make changes consciously rather than discover their cost too late.
Did the first price include the kitchen—or just the building?
A builder may base an early figure on a similar job. Your project can later include different glazing, finishes or a kitchen that the first conversation never covered. The number has stayed in your mind while the assumptions behind it have changed.
Bart and Tina describe the shock of receiving detailed tenders that bear little resemblance to that first estimate. The useful question is what the figure includes, what remains undecided and how much uncertainty it carries.
Early contractor advice can still be valuable. Treat it as information to test alongside the developing brief, rather than a promise about a design that does not yet exist.
01
Set the brief
Agree needs and spending limits.
02
Test the budget
Check scope and assumptions.
03
Review the design
Update costs as choices develop.
04
Compare tenders
Price the same detailed work.
The statement staircase was not in the original brief
A striking stair can become a new priority halfway through design. That is a valid choice, but it is also a change to the project the original budget was meant to cover.
The hosts distinguish controlling cost from telling a homeowner what they may have. If a new feature matters enough, discuss its consequences and decide whether to spend more or compromise elsewhere.
Update the brief and budget together. Keeping the first spending figure while adding new requirements leaves the team trying to deliver two different versions of the project.
Make the cost checks more detailed as the design develops
At feasibility, the question may simply be whether the proposed project is affordable. As options take shape, an elemental cost plan breaks the estimate into parts such as foundations, walls, glazing and finishes.
That breakdown lets the team compare options and revisit the allowances as more information becomes available. The frequency and depth of those checks should suit the scale and complexity of the project.
Before tendering, Bart describes pricing the detailed documents as a final sense check. It can reveal gaps and provide a benchmark for assessing builders’ returns; it does not replace the actual tender process.
What will the finished home cost to run and maintain?
A glass roof changes more than the construction price. Tina asks how a gutter above it will be reached and cleaned once the home is complete. Access that used to be straightforward can become a recurring maintenance task.
Heating, controls and other systems also bring operating costs. These conversations belong in design, while the choices can still respond to the way you intend to use the home.
Cost control therefore continues beyond the build price. Ask about the practical consequences of a specification as well as the amount needed to install it.
Three decisions to take into your project
01 Ask what an estimate includes.
Identify exclusions and undecided items before relying on the headline figure.
02 Change the brief and budget together.
Understand the cost consequences before committing to an extra feature.
03 Plan proportionate cost reviews.
Agree when the team will check affordability as the design becomes more detailed.
The full conversation
The Foundation Series is our 12-episode guide to the home project journey. Architect Tina Patel and quantity surveyor Bart Kolosowski work through the decisions, people and processes involved, step by step.
In Episode 6, Bart and Tina explain how budgets evolve, how cost checks support design decisions and why clear tender information matters when the work reaches site.
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