Addwell is a design-build ADU delivery company based in Longmont, Colorado. We handle architectural design, permitting, and construction as a single coordinated process — not three separate vendors you have to manage yourself.
Addwell was founded by Josh, a registered architect with over twenty years of design practice. His career spans furniture, residential buildings, and urban design — work that's been recognized with multiple design awards across scales.
He also owns Delta Design Build, a residential construction company that's been building and renovating homes along the Front Range for years. That combination — an architect who also runs a construction company — is the foundation Addwell is built on.
Most ADU companies are either designers who sub out construction, or builders who sub out design. At Addwell, the person who designs your ADU is accountable for building it. That changes everything about how decisions get made.
When you hire a GC for an ADU, you're assembling a team from scratch — designer, engineer, permit expediter, builder — and hoping they communicate. We've already done that assembly and locked it down.
Addwell
Our floor plans are designed around Longmont's specific code requirements. We've already resolved the engineering, the setback math, and the structural details. You're not paying an architect to figure this out from zero.
Typical GC
A typical custom ADU starts with a blank page. Design fees, engineering revisions, and code surprises add up before a single board is cut.
Addwell
We work with Longmont's planning and building departments regularly. We know the review process, the common comments, and how to submit a clean package the first time.
Typical GC
A GC building their first ADU in your jurisdiction is learning on your dime. Permit delays turn into holding costs.
Addwell
You get a real number before construction starts. Our scopes are defined, our subs are contracted, and our materials are spec'd. The price you agree to is the price you pay.
Typical GC
Cost-plus contracts mean you absorb every surprise. "Allowances" are guesses. Change orders are profit centers.
Addwell
Because we designed it and we're building it, there's no gap between what was drawn and what gets built. Design intent doesn't get lost in translation.
Typical GC
When the designer and builder are different companies, misinterpretations become change orders. You pay for the delta.
Most ADU projects involve at least three separate contracts — an architect, a permit service, and a builder. Each one hands off to the next, and nobody owns the whole outcome. Addwell is different.
You choose your plan, tier, and style. We produce permit-ready construction documents — architectural, structural, mechanical, electrical. No separate design contract. No hourly billing. It's built into the price.
We submit to Longmont, manage the review, respond to comments, and schedule inspections. You don't chase the building department or wonder what's happening. We handle the back-and-forth because we've done it before.
Same team that designed it, builds it. Panelized construction for quality and speed. Fixed-price contract. Weekly updates. No surprises, no translation errors between what was drawn and what gets framed.
The result: you sign one contract, work with one team, and get one person who's accountable for the whole thing — from the first sketch to the final walkthrough. That's what design-build means when it's done right.
Enter your address in the property finder. In 30 seconds you'll see your lot, your setbacks, and which ADU plans fit your backyard.