How Much Does a Room Addition Cost?
Adding a room to your home can provide needed space without requiring a move for your family. A number of addition types carry specific construction issues, and different building scenarios may affect project prices. Your architect and contractor can help you plan a room addition that meets your needs and integrates effectively with your existing house.
Level of Room Additions
Ground level additions are popular, and can usually be incorporated smoothly with the structure of your existing home. Prices for ground level additions range with their size and foundation type, but typically cost an average of $5618 in the U.S. A second story addition provides options for expansion without increasing the footprint of your home, but requires raising or rebuilding your roof to provide a second living level and costs around $17432. Detached additions are growing in popularity around the country, with prices varying with the size and features of the structure. With an average price of $22814, detached additions can add space to your home in unconventional ways.
Many construction tasks are priced according to square footage, and while many aspects of your project will be priced according to their specifications, the overall size of your addition can help indicate total costs. Small builds of 200-300 square feet average $9468 in the U.S. Increased material and labor costs for larger additions bring prices of $15673 for a 300-400 square foot project, $17414 for 400-500 square feet, $20142 for 500-600 square feet, $24726 for 600-700 square feet, $28879 for 700-800 square feet and $34227 for additions of 800-1,000 square feet.
Architectural drawings provide important construction details for a project, but in most cases are not required to acquire a building permit for a room addition, or to complete construction. Having your addition built without drawings may cost $15432 on average, and requires your builder to prepare his own plans. Providing architectural drawings to your contractor can simplify planning, pricing, and executing construction. The use of drawing impacts overall project prices, with a national average of $12816 to complete an addition.
Building permits are required for room additions, and are granted by the municipality in which construction takes place. The process of securing a permit involves submitting an application and paying a fee, then awaiting approval for your project. With permits secured, construction on your room addition can begin without delay, costing an average of $10623 overall. Without permits in place, fines, suspensions and other setbacks can delay construction and increase costs, resulting in average prices of $14756. Discuss the permit process with your contractor to ensure your application is in order and that permits are secured before construction begins.
Room addition projects for which contractors include materials in their pricing cost an average of $18723. Contract pricing is often used when the parameters and scale of the project are clear, and usually includes buffers to ensure flexibility for changes or complications that may arise during construction. Your contractor may choose to price your materials on a “cost plus” basis instead, providing them as needed while the job progresses. Cost-plus pricing helps maintain a standard of quality while covering all expenses, and may be used on projects with incomplete designs, unclear scope, or when several contractors overlap. Using cost-plus pricing for materials typically averages $15642 for total room construction costs.
Types of Room Additions
Special considerations for different types of additions affect construction and finishing costs. In addition to framing and exterior components, most rooms have several common requirements such as insulation, drywall, electrical, HVAC, and flooring. These elements combine for average addition prices of $10241 for bedrooms, $12617 for living and family rooms, $8647 for lofts, and $9673 for office space. The added plumbing and ventilation requirements of some rooms contribute to average prices of $14952 for bathrooms, $9823 for laundry rooms, and $22817 for kitchens. Other additions may have minimal finish and fixture requirements that affect construction prices, such as garages, which cost about $19446, and sun rooms and screen rooms, which carry installation rates of about $7732 and $6744, respectively.
Planning for a Room Addition
Adding a new space to your house is a substantial project that involves several aspects of home construction. Regardless of the type and size of addition built for your home, several important factors affect the difficulty and expense of the project. Be sure to discuss with your contractor how the characteristics of your addition and its integration with your home affect the complexity and cost of the project.
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