William Blair cuts Builders FirstSource to Market Perform on weaker housing outlook

what happened

William Blair cut its rating on Builders FirstSource to Market Perform from Outperform, according to Seeking Alpha. The firm cited higher mortgage rates, softer residential construction and growing pressure on earnings. Analyst Ryan Merkel said the housing market outlook has worsened considerably since William Blair began covering the stock in February. The average 30-year fixed mortgage rate has risen to 7.4% from 5.98%, housing starts are down 9%, and builder sentiment has weakened.

The firm now expects U.S. housing starts to fall 3% to 5% in 2027, reversing its earlier call for 3% to 4% growth in single-family building. It lowered its 2027 adjusted EBITDA estimate for Builders FirstSource to $958 million, roughly 80% below the 2022 peak. Revenue is seen dropping 3.6% to $13.68 billion. The fourth-quarter EBITDA projection of $202 million sits about 10% under the $224 million consensus.

Merkel also flagged balance sheet risk, with the net debt-to-EBITDA ratio potentially nearing 4.5 times in 2027. The stock trades at around 11 times projected 2027 EBITDA, about two turns above its historical valuation. Merkel still views the company's competitive position positively, but expects the shares to stay range-bound until construction activity recovers.

why it matters

For the building materials sector, mortgage rates remain the main constraint on demand. William Blair believes they must durably fall to 6% or lower before the housing cycle restarts. A possible deal involving Home Depot, Lowe's, QXO or privately held ABC Supply could serve as an alternative catalyst, although the analyst sees near-term deal chances as reduced.

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