I have seen commercial building pads placed on a deep base of rock and gravel fill that has been compacted using mechanized rolling equipment. The main thing you need to understand concerns the rules of construction. Once the pool is empty, it may become buoyant while sitting in the ground. Is it Expansive? The other area would be a patio and/or garden area. What are the site soil conditions and important characteristics of the soil . In fact, it might even be what was used to help create the foundation of your house. When filling with dirt you need to use good clean fill that is then compacted and allowed to settle solid over a long time before building. Also heard that I may be able to convert this into a cellar although I'm not sure if that would be cost effective. Fill dirt is usually subsoil (soil from beneath topsoil) and underlying soil parent material which has little soil organic matter or biological activity. When your pool was installed, you went through the trouble of making sure the area for the pool was leveled. For a vast majority of our projects we truck away ALL of this dirt. Another method demolishes the upper wall sections and pushes them into the pool bottom. This type of dirt is usually subsoil, also known as substrata, which is a material found under topsoil.It is basically partially broken down soil that contains clay, sand, and other materials. An Easy, Cost Effective Way To Fill In/Remove Your Old Swimming Pool Swimming pools are great for those 3 weekends of the summer that we actually use them. This is probably the top mistake we see people make. Fill Her Up. The building over the new pool would be insulated and have large sliding glass doors so that the pool would have an open feel in good weather (about 4 months a year). Pool floor should also be permeated with holes. An Easy, Cost Effective Way To Fill In/Remove Your Old Swimming Pool Swimming pools are great for those 3 weekends of the summer that we actually use them. Before we know it the kids have moved out, and we are left to perform all the maintenance, and incur all the costs associated with this money pit, I mean pool. We always have TONS of free clean fill dirt. The area filled in this way will probably subside irregularly over the next years. 100% totally free clean fill dirt, delivered and dumped where you want it! The simplest way to backfill a pool is to put the dirt that was excavated back into the hole it came out of. Hello all, Just thinking of having my pool filled in or removed and building a double storey extension on top of it ( I'm in Adelaide). Building a swimming pool yourself is not difficult. Then fill dirt and rubble is pushed in. Virginia fill dirt is used for many construction purposes. What does this mean for you? Before we know it the kids have moved out, and we are left to perform all the maintenance, and incur all the costs associated with this money pit, I mean pool.