If your pool is old and tired you may be considering a complete overhaul.
Typical pool renovations would include:
Changing the filtration system perhaps from catridge to sand filter,
Changing a painted or tiled concrete pool to take a liner
Addition of internal steps.
Submerged automatic cover - retro fitted.
General repair of pool walls and liner lock.
Here follows a renovation to a former concrete pool to take a liner.
Here follows a renovation to retro fit an immerged safety cover, new liner and new pool deck/terrace.