Monday, February 1, 2010

Confounding Questions #1: Cost per Square Foot Modeling

Among prospective clients, a commonly asked question is “what’s the cost per square foot?” for building an addition. The short answer would be: we will know when we are done. Not a very satisfying answer is it? Let’s explore a bit further.

First, let’s differentiate between custom renovation and production home building because per square foot costing applies to a commercial real estate model.

Production Homebuilding
In production homebuilding, the house is a commodity. The unit price is linked to volume. The product must contain a prescribed number of finished square feet to fulfill market expectations. So an appealing 3,300 square foot suburban home with four bedrooms and 2.5 baths may start at $500,000. That's about $165/sf. An almost identical home by the same builder sized at 2,220 square feet may list for $515,000. Now we're at $230 per square foot. So. Smaller house = less square footage = higher cost per square foot. Hmmm…..

Custom Renovation
Rarely will a custom renovation in Washington exceed 1,000 square feet. A two-story addition, designed to provide room enough for a master suite, family room and open kitchen, will usually require a minimum 700 square feet of new space plus refurbishment of 300 square feet of existing space. That could easily start at $350,000. That’s right. Start at… Then you need to add costs for custom kitchens, baths, flooring, lighting, windows, doors and trim sets.

Big Difference
  1. Custom renovation is design intensive and content rich. A lot of quality is packed into a relatively small footprint. This involves building new space, reconstructing old space and getting the two to fit together beautifully as a whole.
  2. Production home building is based on volume and repetition. One design and set of materials -with variations- is reproduced over and over.
  3. In renovation, the product is developed collaboratively by the customer and the design/build team. And. You live where you want to live.
  4. In homebuilding the product is delivered to the customer. And. You have to live where the builder put the house.

Final thought: The new home model is a prix fixe menu. The renovation model is ala carte.