Repairs to floors damaged by termites can be a daunting prospect. However, if the damage to the floor structure is minimal, you can attempt the repairs yourself. With lumber, a hammer and nails and some time, you can save a significant amount of money.
Remove top floorboards above any damaged subfloor pieces. If possible, attempt the repairs by crawling under your house or fix the damage from a basement order to preserve your interior floors.
Disconnect any utilities or wires that may be near the damaged wood.
Place a 2-by-4 floor joist as close to the termite-damaged floor joist as possible. Secure the new 2-by-4 by nailing it to the crossbeam base of the floor. This provides the structural support the damaged beam had been shouldering.