Review request template
Send this shortly after the job is done, while the customer still remembers being pleased.
What to change and what not to
Change the specific thing you did — the detail is what makes it read as written by a person. Do not add an incentive of any kind: offering something in exchange breaches the platform's review policies and puts the listing your local visibility depends on at risk, for a number that impresses nobody.
The template
Hi [name], Glad we could sort [the specific thing] for you. If you have a minute, a short review would genuinely help other people nearby decide whether we are the right fit. Here is the direct link: [review link] No worries at all if not — thanks either way, and give us a shout if anything else comes up. [Your name]

