See the published price by pool shell and by finish, side by side, so you know what should be driving your quote before you call anyone.
Published prices divided by published lifespans. The ranking that comes out is close to the reverse of the one you get from upfront cost alone.
What to check before you hire, what a complete quote states, and the one part of the job nobody can price until the old surface comes off.
How to run a California contractor-license lookup and a PHTA directory search yourself, and what each one does and doesn't confirm about a pool contractor.
Why per-city pool cost figures are one national number rescaled by a cost-of-living index, and what actually varies by region: climate, water, and soil.
What decides whether resurfacing is a job to hire out or take on yourself: what the work requires, what licensing and warranty cover, and what a mistake costs.
How long a real pool-finish warranty runs, what it excludes, and the conditions that can void it, read line by line from one manufacturer's own document.