The cheapest ways to install an inground pool are by: Choosing vinyl over concrete or fiberglass. They are much cheaper, but do require more upkeep and are more vulnerable to damage. Building a much smaller swimming pool. Cut down on construction, labour and maintenance costs by having a modestly sized pool. Using a pre-fabricated pool kit. Taking the DIY approach can be satisfying but you will not get the same finish that would be achieved by a professional. Booking installation for the off-season. Some pool installers are quieter during autumn and winter, so you may be able to get a cheaper deal. Resist buying extras. Swimming pool accessories and additions can mount up costs. Cut back on these to keep your pool installation as cheap as possible.