Why it matters
A low headline number can hide missing work. A serious comparison should show what is included before the buyer treats two quotes as equal.
The product part of the price
Different SPC products can have different core quality, wear layer, surface finish, backing and lock profile. Those differences affect cost and suitability.
Thickness alone does not explain product quality.
Wear layer should match traffic and cleaning needs.
Product documents should match the exact SKU when requested.
The site part of the price
The same product can require different work in different homes. Existing tiles, floor level, door clearance, skirting and access timing can all affect the final scope.
Uneven or hollow areas may need review before installation.
Doorways and transitions can require detail work.
Furniture, access and scheduling can change workflow.
What makes a quote worth comparing
A quote becomes useful when it shows product, area, site condition, included work and timing. Without those details, the cheapest number may not describe the same job.
Compare line items before comparing totals.
Ask what is excluded if the number looks too simple.
Use photos and approximate area to start the review.