About Spire

Built by builders who have been there.

Spire Constructors is run by its owners, Bill Breunig and Gary Kerber. Between them: 50+ years of leadership, 100+ projects and $250M delivered across commercial and residential construction over their careers.

Straight from the field

Hands-on, in the literal sense.

We wrote this one ourselves. Owners included, boots and all.

Owner-operated · Delray BeachField Report
Spire Field NotesBuilt to a Higher Standard · Serving all of Florida
On the ground in South Florida

Owner-operated is not
a buzzword here

No corner office, no clipboard from a safe distance. Two owners knee-deep in the South Florida brush on another groundbreaking.
Bill Breunig and Gary Kerber standing in tall grass at a South Florida groundbreaking
On site: co-owners Bill Breunig and Gary Kerber at a South Florida groundbreaking. Boots muddy, bug spray wearing thin, still grinning.

On a humid morning at the edge of a South Florida build site, surveyors setting their stakes and grass standing taller than the trucks, the two men who run the company were exactly where they tend to be: out in it. That is the whole idea behind Spire Constructors, a general contractor where the owners are not signatures on a letterhead but the people on the ground.

It is a simple promise, and an increasingly rare one. The principals do not send a proxy to the hard meetings or the muddy mornings. They walk the site, read the dirt, and answer for the result, because their names are on it.

William “Bill” Breunig30+ years · multimillion-dollar construction

For more than three decades, Bill Breunig has managed every phase of multimillion-dollar construction: high-rises and luxury condominiums, infrastructure, corporate interiors, and healthcare facilities. A veteran of Plaza Construction Corp., one of New York's premier builders, he oversaw more than $500 million in projects.

Along the way he built a reputation for ironclad cost control, sharp contract negotiation, and careful subcontractor selection, plus the kind of client relations that turn first-time owners into lifelong ones. The discipline shows up early. Most jobs, he will tell you, are won or lost long before the first shovel hits dirt.

Gary Kerber20+ years · development to commercial build-outs

Gary Kerber brings more than twenty years across every scale of construction, from ground-up residential development to large-scale renovations and commercial build-outs. A licensed real estate broker with deep knowledge of zoning and entitlement law, he reads a land-development code as easily as a set of structural drawings.

His specialty is scaling construction the modern way: through technology. He keeps schedules honest, coordinates vendors and subcontractors, and gives clients a level of day-to-day visibility most contractors never bother to offer.

“Build it like your name is on it. Because it is.”

Between them sits more than fifty years of building and a single shared rule: be on site, be straight with people, and deliver the job as if the family name rode on every detail. It does.

Based in Delray Beach and serving all of Florida, Spire Constructors is owner-operated in the only way that truly counts. The owners show up, boots and all.

Bill and Gary founded Spire Constructors in 2025 after years building together. The projects on this site were delivered by them over their careers.

We started Spire to fix what frustrated us most.

Opaque pricing, endless change orders, and clients left in the dark. Our model is the opposite: transparent, communicative, and relentlessly hands-on. The owners stay involved from the first estimate to the final walkthrough, on every single project.

How we work

What we stand for

Transparency

Honest pricing and open books. No surprise change orders.

Communication

Daily logs, real-time updates, and a client portal on every job.

Software & AI

We run on modern construction software and lean on AI for faster estimating, tighter scheduling, and document review that catches problems before they cost you.

Attention

The owners stay involved from estimate to final walkthrough.

Field Documentation

Time-lapse cameras and drone flyovers document every new build, start to finish.

Ready to build?

Talk to the people whose names are on it.

Free consultation, no obligation. You will talk to someone who has built what you are planning.

Book a Free Consultation or call (844) SPIRE-GC
Call NowBook Free