I an selling a 200 year old cottage that had damp proof chemical injection and replastering. didnt get garrantee, can this now be covered.

only by the company that carried out the work

It can only be certified by the company that did the work

can only be garrantee by the company that did the work. how old is the work???? call the company .

Agree with all three answers above - The guarantee is provided by the contractor who completed the works. Check over all your paperwork - i.e. report, invoice and any other documents your received upon taking on the contractor. If you are unhappy with the service we would suggest you contact a consumer group (consumer direct - trading standards) or go to any associations/bodies that they are members of - like Property Care Association (PCA) who can assist you in getting the situation resolved. If the member is a PCA member you can also apply - for a fee - for an insurance policy to cover the works in case the contractor ceases to trade - in such case anothe PCA member carried out any works that have failed under the guarantee terms. Good luck