Cost to install a reverse osmosis system

Under the kitchen sink, unit already bought. What would a plumber charge to fit it?

Asked by angie on 3rd Aug 2026
Expert Trade Answers
"What I'd charge depending on the work
Installation Labour
Straightforward connections, existing tap £100–£130
Full RO system with new drinking tap £150–£180
Drilling work or additional pipe alterations £180–£250"
Answered on 12th Nov 2026 - Member since Nov 2026 - report
"If the unit is already purchased and it’s a straightforward installation, the labour would typically be around £100–£200, depending on whether the sink, waste pipework, taps or plumbing need to be disconnected and refitted.

If any pipework needs altering, or the unit requires cutting to accommodate the waste and water supplies, the cost may be slightly higher."
Answered on 8th Oct 2026 - Member since Jun 2023 - report
"Depending on space and ease of access to existing pipe work around £200 to £300"
Answered on 8th Aug 2026 - Member since Jul 2026 - report
"reverse osmosis system, I’ve charged customer 250£."
Answered on 3rd Aug 2026 - Member since Feb 2026 - report
"I would charge around £150 to £220 depending on
Space and complexity"
Answered on 3rd Aug 2026 - Member since Jul 2026 - report
"I would charge 150-200 depending on access and if all materials have been purchased"
Answered on 1st Nov 2026 - Member since Oct 2026 - report
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