Basement Costs London: Updated 2026 NU Projects Guide

NU Projects has reviewed and updated this earlier basement cost advice for 2026. Its shell, fit out and lifestyle guidance now forms part of one more complete London basement resource.

Read the complete 2026 basement cost guide

Continue to The Real Cost of a London Basement: What Homeowners Need to Know Before Starting.

The expanded guide covers current rates per square metre and square foot, the difference between shell and fit out, a worked 500 square foot example, waterproofing, professional fees, planning and prime West London delivery.

It also explores cinemas, gyms, wellness rooms, guest suites, wine rooms and family spaces, showing how design and engineering work together to create valuable new accommodation.

Considering a basement? Book a confidential feasibility consultation with NU Projects.