W-2 employees cannot use job-related expenses as a deduction on a federal return. But if you are a W-2 employee then the employer has to pay the employer half of Social Security and Medicare and withhold federal and state tax.
You would not "fill out" a W-2. If he wants to pay you as an employee you fill out a W-4 to indicate how you want your tax withheld.
https://ttlc.intuit.com/community/tax-topics/help/what-to-know-about-the-new-2020-irs-form-w-4-emplo...
https://www.irs.gov/pub/irs-pdf/fw4.pdf
https://www.irs.gov/individuals/tax-withholding-estimator
What receipts are you referring to? Who has been paying for the construction materials and supplies? You need to have a very clear understanding about those expenses with the homeowner.
If you continue to work as an independent contractor you can put your expenses on a Schedule C.
https://ttlc.intuit.com/questions/2584365-am-i-an-employee-or-an-independent-contractor
https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...
https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922
https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax
https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c
https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct
https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
