24/07/2026
The biggest budgeting mistakes in home extensions rarely happen on site.
They usually happen months earlier.
A homeowner appoints an architect.
They commission drawings.
Planning permission is approved.
Structural calculations are complete.
They’re excited because their project finally feels real.
Then they ask builders to price it…
…and discover the build costs far more than they expected.
Nobody has done anything wrong.
The architect designed exactly what was asked for.
The homeowner followed the process they thought they should.
The problem is simply that the person who understands construction costs often isn’t involved until the biggest financial decisions have already been made.
After pricing hundreds of extensions and renovations, we’ve seen this pattern repeat itself time and time again.
That’s why, from 1st September 2026, we’re changing how every new Cubit project begins.
We’d rather help someone make the right decision at the beginning than deliver bad news at the end.
📐 Already have drawings?
We’ll prepare a Detailed Cost Plan from £125 including VAT.
This is professional cost planning.
Following a site visit, we’ll prepare a detailed construction cost plan and project financial document, giving you a realistic understanding of what your project is likely to cost before you commit to construction or choose your builder.
It’s yours to keep and use, whether you build with Cubit or not.
💡 Starting with an idea?
We’ll begin with a 40-minute Design Consultation, followed by a written Feasibility Report from £490 including VAT.
You’ll receive honest advice, realistic budget guidance, layout recommendations and clear next steps before you spend money on architectural drawings.
📅 Ready to move forward?
A £1,000 reservation secures your place in our programme and is credited in full against your construction contract.
We’re introducing this process because better decisions are made when realistic construction costs are introduced earlier.
Our aim is simple:
• Help you understand what’s possible.
• Help you understand what it’s likely to cost.
• Help you make informed decisions before committing significant time and money.
We believe every great project starts with clarity.
Know your numbers. Before you commit.
If you’re planning an extension, renovation or whole-home remodel across South Birmingham, Solihull or Warwickshire, we’d love to hear about it.
What’s the biggest uncertainty you’re facing right now?
Budget?
Design?
Planning?
Or simply knowing where to start?
Ask us in the comments—we’re always happy to help.