6. Consider long–term costs, not just short–term gains.
If your addition calls for clapboard siding, for instance, you can save more in the long run by ponying up now for the preprimed and prepainted variety. It costs an extra 10 to 20 cents per foot, but "you'll wind up paying for half as many paint jobs down the road," says Paul Eldrenkamp, owner of Byggmeister, a design–build remodeling firm in Newton, Massachusetts. The reason? Factory finishes are applied on dry wood under controlled conditions—no rain, no harsh sun. "I used prefinished claps on my house about ten years ago and the only flaw in the finish is the occasional mildew spot, easily washed off," Eldrenkamp says. "The paint looks as if it'll be good for another ten years, easily." Cost of unfinished siding for a 10–by–40–foot addition, plus two paint jobs: $5,000
Cost for prefinished claps and one coat of paint at installation: $3,750 SAVED: $1,250

7. Tap your contractor's sources.
When it comes to things like flooring, ask your subcontractor if he has odds–and–ends stock left over from other jobs. While renovating a Civil War–era bed-and-breakfast in New Jersey some years back, contractor Bill Asdal needed wood flooring. He made a few phone calls and came up with hundreds of square feet of hardwood, in various lengths and widths, that otherwise would have gone into the trash on other job sites. Just by planing it to uniform thickness, then sanding and refinishing it, he saved his client almost $9,000 in materials costs.
Cost of new flooring: $19,200
Cost to use someone else's discards: $10,500
SAVED: $8,700

8. Limit recessed light fixtures.
"The more recessed lights you put in, the more it's going to cost," says Tom Silva, This Old House's general contractor. In addition to the fixtures, there's the labor to cut all the holes and insulate them properly. A wall– or ceiling–mounted light can also deliver more wattage, which means you may be able to get away with fewer fixtures.
Cost to install six can lights: $900
Cost to install one surface–mounted fixture of equal wattage: $300
SAVED: $600
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