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“It’s important you choose a certified installation company because they will be able to advise you on all regulations.” It’s best to talk to a few installers and get their estimates. Most of them will give you an idea of costs over the phone before arranging a survey on your home.
Ask them how long the work will take as well as what the warranty and/or guarantee for their work is. If any guarantees are insurance-backed this will help you avoid any surprises later.