Cancel Something You Agreed to at Home: 14 Days

If you arranged work at your home, by phone or online you generally have 14 days to cancel from the day after you agree the contract; you pay a proportionate amount for work started during the period only where you asked for it to start. source

If the trader fails to give you the required cancellation information, the cancellation period can extend to 12 months plus 14 days (Consumer Contracts Regulations 2013 reg 31), and you bear no cost for services supplied during the cancellation period if the trader did not give the required cancellation information (reg 36). source

Exceptions to the 14-day right include made-to-measure items and urgent repairs you ask for (for example emergency plumbing). If you agreed the work at the trader's premises, whether you can cancel depends on whether a contract has been made and the work has started. source

The seller must refund you without undue delay, and within 14 days of getting the goods back or of you supplying evidence that you sent them, whichever is sooner. If nothing needs returning, within 14 days of being told you are cancelling. The refund must use the same payment method, with no fee (regulation 34). source

Section 75: if you paid part or all by credit card for an item costing over 100 pounds and up to 30,000 pounds you can claim against the card provider for breach of contract, but you usually cannot use it if you did not buy directly from the trader. source