Hi, thanks for your question. My name's XXXXX XXXXX I'm going to assist you with it.
If the installers have breached express terms of your contract with them (this is regardless of whether the contract is written or verbal) and you suffer financial loss as a result (for instance what you receive is less valuable or you need to instruct another company to remedy poor work) you can bring a claim for breach of contract.
As for the damage to your property, in addition to any express terms, there are "implied" terms under contracts for the provision of services and these include the term under s.13 of the Supply of Goods and Services Act which require that the service provider exercises due care and skill in providing the service. If this is breached and you suffer loss, then you may have a claim for breach of this "implied" term which can be actionable to compensate your loss for remediating the damage.
If this is a relatively low value claim (under £10,000), a good course of action is to write a letter before claim, setting out the relevant provisions, the breaches thereof, your previous requests for the situation to be rectified and appending any relevant evidence relating to you possible claim (estimates, invoices, photographs, emails etc.). You can advise that if you do not receive a satisfactory outcome you will consider taking legal action for compensation.
If you do need to bring a claim (and the matter is relatively straightforward), you can use the online service at www.moneyclaim.gov.uk to bring a claim or instruct a solicitor to bring a claim on your behalf. If the claim is under £10,000 you cannot recover legals costs but (in the same manner) you are not exposed to such costs of the defendant.
Can I clarify anything?