New: Design your pool online
Two wicker lounge chairs with blue cushions face a covered rectangular pool, surrounded by greenery and a hedge. A house is visible in the background.

Do I still need to cover the pool if it’s smaller?

If you have an outside pool, you should definitely invest in a cover. This will stop debris, litter and biological matter from being able to fall into the water. If you have an indoor pool, a cover is less important, but they are especially good at retaining heat which will reduce the amount you need to spend on heating costs.