Range from the cheapest building of under stairs storage £675 (PI Building Limited based in SE9) to the dearest building of under stairs storage £1,035 (VLD Ltd based in SE14).
Comparing carpenter and joiners estimates for designing under stairs storage gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.
What to do - Get rates and quotes to build under stairs storage in SE13 by posting a job with HaMuch and we will send it to carpenter and joiners in SE13.

"Under stairs storage"
SE6