The savings
A full renovation — replaster, tile & coping, equipment upgrade, some deck work — runs $30,000–$75,000. A brand-new pool of similar size runs $90,000–$160,000. Renovation typically saves 50–70% vs. a new build and delivers a pool that looks and performs like new.
When to renovate
The shell is structurally sound. Plaster is failing but the gunite underneath is intact. Equipment is old but the plumbing is reusable. You want a modernized look but the current shape and location work for you.
When to rebuild
Structural cracks in the shell that keep coming back. Major shell settling. You want to change the location or dramatically alter the shape. The pool is a decades-old vinyl-liner rebuild and you want to convert to gunite. Insurance or engineering has flagged it.
What renovation can change
Interior finish (new plaster/pebble/quartz). Tile & coping. Equipment (pump, heater, salt system). Add a sun shelf or integrated spa. Update steps or benches. Add lighting and automation. Extend the deck.