The legal process involved in property transactions is known as Conveyancing.

If you're taking out a mortgage, you'll need a solicitor or conveyancer to handle the legal aspects.

It's important to have a solicitor lined up before you submit your mortgage application, unless you are remortgaging.
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Getting your legal work sorted early helps speed up the entire process, allowing you to submit your application more quickly. It also gives you leverage with your estate agent, as they may be more willing to take the property off the market