At Fast Struct, we don't hand you a catalog and ask you to pick a box. We hand you a blank canvas.
Whether you're envisioning a private backyard retreat, a rental income unit, or a spacious live-work studio - our team designs your ADU around your property, your lifestyle, and your budget. Every layout, room size, finish, and configuration is tailored from the ground up.
What does your perfect ADU look like? We'll build it.
Feature Callouts
Any Layout, Any Size
From ultra-compact studios to spacious two-bedroom units.
Fully Custom Finishes
Flooring, cladding, rooflines, HVAC, electrical - all your choices.
Designed For Your Lot
We work around narrow driveways, tricky access, and tight lot lines.
Steel-Framed Precision
Every ADU built to millimeter tolerances in our Santa Clara facility.
Get Your Free Estimate
Fill out the form and a Fast Struct specialist will reach out to discuss your project, walk you through your design options, and outline your build timeline. No commitment required.
Fast Struct: California's Premier ADU Builder
Adding an ADU to your California property shouldn't mean months of noise, disruption, and uncertainty. Fast Struct built a smarter way.
As a licensed California contractor with a state-approved manufacturing facility in Santa Clara, we specialize in factory-built ADUs that arrive 95% complete and are craned into place in a single day. Your backyard stays clean, your neighbors stay happy, and you get a premium living space faster than any traditional builder can promise.
From permits to final delivery, your dedicated project manager handles every step. We're not just ADU contractors near you. We're your partner from day one.
What We Build
From compact backyard studios to spacious two-bedroom units, every Fast Struct ADU is engineered to your site, your design, and your timeline.
Detached ADUs
Fully custom standalone steel-framed units built in our factory and delivered to your property.
Junior ADUs (JADUs)
Smaller attached units that maximize your existing footprint within a residence.
Modular ADUs
95% factory-built for maximum speed and quality, craned into place in a single day.
Panelized ADUs
Precision steel Smart Walls for design freedom and properties with difficult lot access.
Multi-Unit ADU Developments
Scalable solutions for property developers and investors looking for rapid deployment.
Permits, Site Prep & Delivery
Full process handling from zoning and state-route permitting to final site handover.
Two Paths. One Standard of Excellence.
We don't force you into a box. Fast Struct recommends the construction method that fits your site, your design, and your timeline. No upsells, no guesswork.
The Panelized Route — Ideal for Design Freedom
Precision-engineered steel Smart Walls that pack flat and assemble rapidly on-site. Ideal for properties with limited access or wider, open layouts.
- Works on narrow driveways and difficult lots
- Supports wider, more open floor plans
- Maximum design freedom
Your ADU, Built Smarter.
Discovery
We assess your property, budget, and goals to recommend the right ADU type and construction method for your lot.
Design & Permit
Our team customizes your floor plan and navigates the local zoning and permitting process on your behalf. Because we're a state-approved modular factory, plans submitted through the state route are approved in days — not the months it takes traditional builders. You stay informed without the headache.
Fabrication
While your foundation is prepared on-site, your ADU is simultaneously precision-manufactured in our Santa Clara, California facility. This parallel process — steel-framed, factory-controlled, and built to tolerance — is exactly how we move so fast.
Assembly
Your unit arrives and is craned into place. Installation is rapid, clean, and quiet.
Handover
Walk into a fully finished ADU ready for occupancy. Keys in hand, no punchlist.
As Fast As 90 Days
Our parallel factory and on-site process means your ADU is ready faster than any traditional ADU contractor near you can promise.
Steel Construction — Not Wood
Every Fast Struct ADU is built with a steel frame, not wood. Steel is non-combustible, doesn't rot, and holds to millimeter-level tolerances. It's a fundamentally better building material — and one that 90% of our competitors simply can't offer.
State-Approved Facility = Faster Permits
As a state-certified modular factory, our plans go through the state approval route — meaning permits in days, not months. No other local ADU builder can say that.
Complete A-Z Solutions
Permits, design, fabrication, and delivery all handled by one team. One point of contact, zero coordination stress.
Arrives 95% Complete
Your ADU is craned onto your property nearly finished. Installation takes a single day, not months.
Factory Precision, Premium Finishes
Premium materials and finishes built to tolerances that traditional ADU builders simply cannot match.
Dedicated Project Manager
One person guides you personally from the first call to the day you hand over the keys to your tenant or family member.
Licensed CA Contractor + State-Approved Facility
Fully licensed, bonded, and compliant. Every build is warrantied and certified.
“Fast Struct delivered our dream home in under 90 days. The quality is unreal. The steel construction feels so much more solid than wood.”
- Sarah M.
Completed Projects
Experience the quality and craftsmanship of our recent custom ADUs.
Headquarters
3395 Edward Ave
Santa Clara, CA 95054
Counties we serve
- Santa Clara County
- San Mateo County
- Alameda County
- Contra Costa County
- Santa Cruz County
Ready to Build Your ADU?
Get a free estimate and see how we can bring your vision to life in 90 days.