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- 1). Measure the porch base and roof dimensions. Design a room that is no less than 9 ft. by 12 ft., if possible. Plan to extend the roof somewhat if you need to. Look at ways to support porch flooring by adding cinder block columns and 2-by-12-inch support floor joists, if needed. Building on a 12-inch concrete base, for example, is ideal.
- 2). Fix all needed roof repairs. Check for any leaks, and repair plywood sheathing if needed. Tear off old asphalt shingles and add new 1/2-inch plywood if leaks are significant. Cover the plywood with tar paper and nail new shingles into place. Add appropriate guttering, downspouts and splash blocks to skirt water away from the new room's foundation.
- 3). Sketch an exterior and interior design on graph paper. Construct all framework by installing 2-by-4-inch studs on 16-inch centers. Leave room in the design for a walk-out door and windows. Figure out access to the existing house. Take out part of an exterior wall, for example, to incorporate the porch room as part of another room. Use a home's present walk-out door as the entry door into the room, as another option.
- 4). Install house siding, windows and a steel walk-out door. Use siding that currently covers the home or install a combination of materials. Install stucco, stacked stone and brick veneer, for example. Make sure the space looks original to the house construction. Don't build the room in a random fashion, or it will devalue the home's market appeal. Install energy-efficient windows to help keep heating and cooling costs down. Erect a steel door with a deadbolt for security.
- 5). Finish up the interior insulation and details. Install fiberglass roll insulation between studs and attic rafters on the porch. Run any plumbing lines or electrical wiring before nailing up drywall while walls are open. Install drywall and complete its finish by using drywall tape over gaps and joint compounds. Sand the wall and ceiling surfaces smooth before painting the room. Put flooring down last so that paint drips, for example, won't ruin the new tiles or hardwood.
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