Bolster (YC S21) — The platform for buying, selling and managing residential construction
We are building the Amazon for construction where contractors can give their customers an interactive shopping experience, turning the estimate into a point-of-sale, for the first time. It is a marketplace for general contractors, subcontractors, retailers and consumers, powered by a database of over 114,000 real items.
Bolster is a Y Combinator company in the Summer 2021 batch. Its directory entry describes it as: The platform for buying, selling and managing residential construction. The founder listed is Mike Bignold (Founder) (Y Combinator directory entry, June 23, 2021).
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We are building the Amazon for construction where contractors can give their customers an interactive shopping experience, turning the estimate into a point-of-sale, for the first time. It is a marketplace for general contractors, subcontractors, retailers and consumers, powered by a database of over 114,000 real items.
Mike Bignold
Founder
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
One of 53 companies held here in Real Estate and Construction › Construction.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
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Example from a real report (our sample on Target): “In March 2026, Target announced a planned incremental $1 billion operating investment” Source: Target Corporation (press release)
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The Short Answer
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Who Runs It, And How To Reach Them
The Money: Funding, Valuation, Runway
Who Pays Them, And Who They Are Up Against
Warning Bells
Sources
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