How to Estimate an Addition to a House

Research recent home addition estimates. The Cost vs. Value Report provides annual averages for midrange and upscale remodeling costs. ServiceMagic.com has an online home calculator that provides personalized estimates for home additions.

Compile a detailed list of all the materials required for the project. This step is particularly important if you plan to complete the project yourself. Visit home improvement stores and browse online retailers to obtain accurate pricing information about each item.

Meet with a remodeling consultant to discuss your room addition estimate and determine whether you have left anything out. Most remodeling consultants do not charge for an initial consultation.

Search for a reputable, licensed contractor for large-scale additions. Ask family members, friends and real estate agents for referrals and research the company credentials before you schedule appointments. The Better Business Bureau and your local consumer protection agency are good places to begin.

Schedule appointments once you narrow your search to three or four licensed contractors. During the appointment, be clear about your home addition needs and expectations. The contractor will provide you with an estimate, so review carefully before making a final decision.