Get an instant cost estimate for your home extension based on real UK build rates. Adjust the inputs and the estimate updates live.
Typical single-storey kitchen extension: 20–35 m². Loft bedroom: 25–40 m².
Budget: functional finishes, standard materials. Mid-range: quality fixtures, good spec. High-end: bespoke joinery, premium materials throughout.
Once your build starts, Ted helps you track every payment against this budget — for free.
Download Ted free →Disclaimer: These estimates are based on average UK build costs for 2025/26 and are intended as a planning guide only. Actual costs vary significantly depending on ground conditions, structural complexity, builder rates in your area, material choices, VAT (standard-rated at 20% for extensions), and unforeseen works. Always obtain at least three written quotes from qualified builders before budgeting. These figures exclude architect/planning fees, party wall surveys, structural engineering reports, and building regulations fees unless stated.