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It's a carpenter or joiners job!
I don't like doing them because new doors need a fair bit of time to settle in and they can warp due to the different interior/exterior temperature and humidity. Most doors should be stored on site for a while to acclimatise to the humidity and spring is a good time to fit them.
I would say fitting a lock is easy if you are only aiming to do an average job! Since most locks in London seem to have been fitted by carpenters with blunt chisels.
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Think we’re going to go with these guys. They’ve been pretty responsive and the quote isn’t as astronomical as others we’ve had. http://www.jecarpentryservices.co.uk/Portfolio
Yeah, looking for an independent joiner rather than one of the big companies. London Doors et al are nice but very pricey.