Ask them to fix the problem. If they can’t, they must give you a full cash refund.

You must give him the opportunity to remedy his bad painting. If he refuses, or fails to do so in a reasonable time, you can cancel the contract and obtain a refund.

Alternatively, you could have the house repainted by someone else, and recover the costs from the original painter. This may involve taking him to the Disputes Tribunal.

Yes. If you were warned the paint was unsuitable, you have no comeback against him.

If you have not previously agreed to a price or pricing formula, you are required to pay only a “reasonable price”. This applies to goods as well as services. A reasonable price is the market price – in this case, roughly what other roofers would charge for the job.

No. If you and your plumber did not agree on a date by which the work must be completed, then it has to be finished within a “reasonable time”. A reasonable time is the amount of time it would take a competent person in the same trade to complete the job.

You can ask your plumber to complete the job by a specified date. If he doesn’t, pay him for the work he has done so far, then cancel your contract with him and have another plumber finish it.

His. He must complete the job using reasonable skill and care. If he gives up, you can cancel your contract with him, refuse to pay his bill (except for work he has completed to a reasonable standard), and arrange for another plumber to complete the job.