Soft costs on a house build explained
Soft costs are everything that is not the physical house: design, surveys, permits, lender fees, insurance during build and contingency. They often run fifteen to twenty-five percent of the construction cost on a self-build. Under-budgeting them is a common reason the all-in number drifts before the builder's quote arrives.
What usually counts as soft?
- Architectural and structural design
- Planning and building control fees
- Surveys you commission before lending
- Lender arrangement and inspection fees
- Site insurance and contingency
When do soft costs hit cash flow?
Design and permit fees often come before the main construction invoice. Map them on the same timeline as the payment schedule checklist before you compare builder quotes.
How does this link to quotes?
A builder quote may exclude design you already paid separately. When you split a budget, keep architect fees out of hard construction so two quotes stay comparable.
Questions on this
Are kitchen appliances soft costs?
Usually yes if you buy them yourself. If the builder prices a fitted kitchen as one line, that line is hard construction.
Should VAT sit in soft costs?
Treat VAT as its own line. Ask whether each quote is inclusive or exclusive before you compare totals.
Where can I model the split?
Use the free budget calculator on the quotes site. It is arithmetic only, not a reading of a contractor file.
Read one before you buy one
The specimen shows the whole structure: status, what each payment was meant to buy, the forecast with its range, the photographic record and the limits of what was checked.