Ethical upselling means pointing out related work that genuinely helps the customer and giving them an easy choice. Done well, it raises your average job size and your customer's satisfaction at the same time.
Helping vs pushing
If the add-on solves a real problem you observed, mention it. If it only benefits you, skip it.
The "while I am here" offer
Because you are already on site, small extras are cheaper for the customer (no trip charge). Say so honestly: "While I am here I noticed X. I can do it for $Y now."
Inspect and report
Look over the area for related issues and send a short list with photos. Prioritize safety issues first.
Present options
Offer good, better and best choices on materials or scope in the quote. See professional estimates.
Project upgrades
If a small repair reveals a bigger issue, explain the options and let the customer decide.
Track what sells
Note which add-ons customers accept and refine. See time tracking.
FAQ
Is upselling bad?
Not when you suggest genuinely useful work and respect a no.
How do I suggest extra work?
Explain the benefit, give a price and let the customer decide.
Should I offer options in quotes?
Yes. Good/better/best options help customers choose.
What if the customer declines?
Accept it graciously and note it for later.