Can I refuse a significant price increase from my builder if delays were on builders behalf and I signed a fixed-price contract?

If you have a fixed-price contract, your builder generally cannot impose significant price increases, especially if delays are due to their own actions. While some contracts may include clauses for unforeseen circumstances, these are typically for material cost fluctuations beyond reasonable control. It is advisable to review your contract carefully and seek independent legal advice to understand your rights and options regarding any proposed price hikes.