Designs and blueprints are the first step in any construction project. Once you have decided what you want to do, make a rough drawing of your plan. If you have skills in drafting and mechanical drawing, you can do the drawings yourself. For a major project such as this, however, hiring an architect is a good idea. An architect has the expertise and the vision to give you a thoroughly integrated remodel and addition. The finished look of your home will be well worth the fee you pay him.
Consult with your building department about the permits you will need. Building officials will also tell you about any restrictions.
Unless you are fortunate enough to already have the money for your project, you will also need to pay a visit to your banker to obtain financing. Create an itemized budget, and take your blueprints to your appointment. Financing options include home equity and personal loans. Research loan terms before signing any agreement.
If you are doing the work yourself, you will need to find a supplier and price materials. If you are hiring a contractor, ask friends for recommendations and get estimates from each. Ask the contractors for references, and call them. A contractor will hire his own subcontractors. If you want to serve as the general contractor, interview the subcontractors the same way you would interview prospective contractors. Don't feel bound to hire the contractor or subcontractors who give you the lowest estimates. Hire the professionals with solid work and recommendations.
When you finally leave the realm of planning, you will begin construction. First, you will enlarge the foundation to accommodate your addition. Timing is important when you begin a building project; you should start late enough in the year to avoid snow but early enough to at least finish framing before winter arrives again. Rough in the addition before doing any remodeling.