Squeaky FLOOR Repair :From bottom and top :900 sqft :Scarborough

Scarborough : SHARE CONTACT NUMBER .

Bungalow main floor (900 sq ft) is squeaky because of gaps between sub floor.
What needs to be done.
a. From under , Put 2×2 or 2×4 between joists / studs to add support .
b. Put screws / shims as well as PIL glue from below .
c. Put headless screws from the top also.

Please quote labor price only. Skilled person needed . Work needs to be done correctly. Payment per work completion %.