From the position of someone who has been asked for a loan by a family member...
Call/text and ask can you call over for a chat, give them some idea what it's about, and ask is there a convenient time.
Are these home improvements absolutely necessary (eg a leaking roof, damp proofing, the house is about to fall down, etc) or do you just fancy a new kitchen?
Go armed with proof of your financial situation and your repayment plan... not just "oh yeah, of course I'll be able to to pay it back". I want to know how - how much each month can you afford to pay back, end date when the Ioan will be fully repaid, what will you do about the repayments if you get sick, lose your job, etc.
Are you willing to pay interest?
Don't expect an answer there and then, and expect, or even better suggest, to have something put in writing and signed.
Be prepared for the answer to be NO, and don't hold any ill feeling towards them if that is the answer. Remember you are not entitled to this loan and they are doing you a favour if they agree.