Combi or system boiler swap including flush, new flue, controls and Gas Safe commissioning.
Boiler replacements in Barnet typically cost between £220,917 and £521,027 depending on size, specification and site conditions. A mid-range 90 m² project averages around £321,062. London pricing reflects higher labour rates, parking permits and tighter site access.
Most boiler replacements take between 6 and 16 weeks on site, depending on scope, structural complexity and planning requirements in Greater London.
Many boiler replacements fall under permitted development, but conservation areas, listed buildings and larger projects in Barnet can require a full planning application. Use the cost checker to see what applies to your address.
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Disclaimer: This is an industry-informed estimate for guidance only — not a fixed quote, valuation, survey or legal advice. Figures are based on UK regional averages and the details you provided. Site-specific factors (access, ground conditions, structural surprises, planning constraints) can materially change the cost. Always confirm with a site inspection, written quotes from qualified UK tradespeople, and supplier pricing before committing to work. Build Price IQ accepts no liability for decisions made on the basis of these estimates.