| Average cost | $15,000 |
| Medium | $13,000 - $17,000 |
| Low end and high end | $10,500 - $22,000 |
Before signing a contract verify contractor's license with Maryland Home Improvement Commission (MHIC) to make sure the license is still active. You may verify online or by phone:
Any home improvement contractor should provide you with current general liability insurance certificate. In order to be working at your home the contrator must have a copy of a current worker's compensation insurance certificate.