in my opinion, if a guarantee or warranty goes “past a handshake” ,
a builder should have all the parameters drawn up in some kind of written format
that covers what you will and will not cover once it leaves your shop and for how long.
the buyer does not have to sign it. but it is a good idea for the builder to sign and date it
and keep one copy for yourself and give one copy to the buyer. many samples on the WWW.
“good fences make good neighbors” concept.
Warranties: written or implied ?
https://www.consumer.ftc.gov/articles/0252-warranties
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-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --