The case study behind the plan
Before it points anywhere new, the magnetics plan points back to something already proven. Tim Costello spent two decades building the cooperative that organized American homebuilding online. Here is what it did, and why it is the template.
Around the turn of the millennium, a group of the largest homebuilders in the United States did something competitors rarely do. Rather than each building and funding its own weak web presence, they pooled money and founded one company together, in Austin, to build the shared infrastructure none of them wanted to build alone. That company was BuilderHomesite, and the builders did not just use it, they owned it.
The founding names were the biggest in the industry, Centex, D.R. Horton, KB Home, Lennar and Pulte among them, and the roster grew to more than thirty. By the time the business was sold, roughly two dozen builders still held it as owners. That ownership is the whole point: the members carried both the cost and the upside, and the customer data ran through infrastructure they controlled rather than a vendor's.
The consumer face of it became BDX, the Builders Digital Experience, and its flagship, NewHomeSource, grew into the largest listing site for newly built homes in the country. Tim Costello founded the cooperative and ran it as CEO for about twenty-two years, until he retired in 2022. He now runs Correlated Magnetics Research, the company behind Polymagnet.
Plenty of industries share a listing site. What made BuilderHomesite a model worth copying was the second layer, added deliberately once the first was working.
Layer 1
Competing builders stopped fighting alone for search traffic and portal placement. Their inventory was aggregated into the most complete catalog of new homes anywhere, then syndicated out to hundreds of real-estate sites, so the shared asset fed every member's funnel at once.
Shared demand generation, shared data, member-owned upside.
Layer 2
In 2004 the cooperative launched a joint venture that brought major building-product manufacturers in alongside the builders. Its platform let a buyer choose and visualize upgrade options, and the structural move underneath it was a shared data standard, so a manufacturer's catalog of windows, appliances or fixtures could flow into every participating builder's online design center.
Suppliers plugged into common rails. Names like Whirlpool, Owens-Corning, Honeywell and Weyerhaeuser took part.
The scale is worth stating plainly, with a note on where the numbers come from.
BuilderHomesite founded in Austin by a group of the largest national builders; NewHomeSource becomes its flagship consumer property.
At the International Builders' Show, the cooperative launches a builder-plus-supplier joint venture and an options-management platform built on a shared data standard.
The BDX brand, the Builders Digital Experience, comes into use as the consumer-facing operating name.
A builder ratings-and-reviews program is added, deepening the trust layer.
Tim Costello retires as CEO after roughly twenty-two years leading the cooperative.
Zonda acquires BDX, including NewHomeSource and the options platform, with around 1,200 builders active and two dozen builders still owners.
Homebuilding, before the cooperative, looked much like the coded-magnet field looks now: a real product, a fragmented set of makers and suppliers, and no shared way for a buyer to find any of it. The answer there was not to acquire everyone. It was to build the shared front door first, prove it, and then extend a shared standard downstream until the suppliers wanted in.
That is the sequence the magnetics plan runs. The field is already mapped. The shared front door, a hub and a catalog organized by what a magnet does, is already standing. What remains is bringing the participants in, ring by ring, the way BuilderHomesite did. The full case is on the plan.
Read the magnetics planThis page is a short, original summary written to draw out the model, not a copy of BuilderHomesite's own site. To see the real thing as it was, the Internet Archive holds it: