Determine your practical and aesthetic aims for the attic space. Make a list of any definite needs, such as sleeping areas, bathrooms or a certain amount of storage. Review your finances to determine a maximum budget for the project.
Consult several contractors or architects who are familiar with your style of house and your area. Refer to photos and floor-plans from any past projects they may have done and have a similar nature. Discuss your aims for the project and ask for cost estimates. Discuss the expected time frame for the project and add on a generous "buffer" to anticipate any unforeseeable complications.
Identify the contractor who best suits your project and budget. Avoid working with any contractors who pressure you into a decision, expects you to obtain permits yourself, or offers a discounted price if you pay in advance. Ask for recent references from past clients. Ask to see builder and business licenses, certificates of general liability insurance, and workers compensation insurance and any additional local or state requirements. Put all the details of your project into writing once you identify the best contractor.
Weigh the energy efficiency of building materials over the long term, especially if you plan to reside in your home for a long time. Determine the "years to payback," or length of time until extra cost is paid off by using an algorithm provided by a reputable source, such as the United States Department of Energy Energy Savers (energysavers.gov). Factor in the R-value of various insulation options and the Annual Fuel Utilization Efficiency or AFUE of the heating or cooling system you use.
Weigh any limitations imposed by municipal or state building codes, adjusting your plans as necessary. Avoid putting bedrooms or habitable rooms in smaller areas, or opt for one bedroom instead of two. Avoid arrangements, such as bedrooms accessible through other bedrooms or bathrooms, which often break building codes.
Opt for furnishings that maximize your available space. Put built-in storage cabinets under highly sloped ceilings, where you cannot stand upright. Use multi-function furniture, such as day beds or coffee tables, that could double as seating and dining areas in smaller attic spaces.