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Question DetailsAsked on 12/29/2016

The cost of replacing hot water heater and subflooring

My hot water heater started leaking and to the floor was severely damaged need estimated cost for a hot water heater and subflooring

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1 Answer


Below is a link to many responses on the water heater replacement question - these days commonly $1000-1500 range for a normal efficiency water heater replacement (30-55 gallon range) to maybe $2000 range in tight conditions or walkup in high cost city like NYC or such - with maybe a bit but no major code compliance work along with it (backflow preventer, expansion tank, new gas valve and flex tubing are common code compliance upgrades needed along with a water heater replacement).

The subflooring - if it was sitting on subflooring only and a sheet or two is all that needs replacing, maybe $100-200 more if plumber does it (some will, some will not) - otherwise if a fair amount that needs replacement probably on the order of $3-5/SF tearout and replace subfloor (particle board or OSB (yuck) or interior/exterior plywood (much better). Bear in mind if it got soaked but is dried out in a day or two with lots of fan exposure, so it does not either mold or delaminate, normally (especially if existing floor is exposed subflooring only) it does not need to be replaced just because ti got wet. If it got soaked so much it delaminated or (if particle board or OSB) went to mush or drastically swelled up, then yes should be replaced. Ditto if it swelled or delaminated noticeably and you intend to possibly finish-floor this floor in the future.

Consider, especially if you have a place you can readily run the discharge tubing or pipe (including out an outside wall allowed in most areas as an emergency clean water drain), putting in a metal pan under the heater to catch water from most types of failures - if done when new heater is going in, commonly about $100-150 pan and drain installation additional cost. Will not protect against all types of leaks, but most - especially if combined with a water alarm.

Here is another link or two on previous questions on the subject - commonly a few $/SF for a full room of subfloor replacement TO but not under the walls, to around $10/SF more commonly for full replacement (including under walls). Including removal and replacement of not only subflooring but normal range carpet or laminate or such also - commonly $10-20/SF total.

Answered 3 years ago by LCD

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