3. Power wash paths and siding. Giving your home's exterior and paved areas a power wash can be nearly as dramatic as repainting, for a much lower cost. Rent a machine from your local hardware store if you don't have one.4. Maintain green lawns. Sad, neglected lawns are a major turnoff to potential buyers. Maintaining a healthy lawn from the beginning with regular care is the least expensive route, though laying new sod can be worth the dramatic improvement in curb appeal if you don't have time to start from seed.