High-performance modular construction — faster, more reliable, and engineered for Colorado — without the headaches of traditional contractors, prefab kits, or manufactured ADUs.
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In Colorado, you generally have three paths: traditional stick-built, prefab kits, or high-performance modular. Understanding the difference is key to avoiding budget overruns and year-long delays.
Three ways to add a backyard home — and why homeowners across the Front Range are choosing high-performance modular.
Option 1
Built 100% in your backyard. Projects often drag on for 12–18 months due to weather and labor shortages, and costs are rarely fixed — they typically increase by 20% during construction.
Option 2
Parts are shipped to you, but you must hire the labor to assemble them. Often advertised with “low prices” that exclude the foundation, utilities, and assembly labor — leading to shock costs later.
The Olerra way
95% factory-built. We build your home indoors while your foundation is poured on-site — resulting in a fixed price, a 7–12 month timeline, and steel-frame durability designed for Colorado winds and snow.
The Olerra Modular Flex-Flat redefines the traditional accessory dwelling unit, offering unmatched versatility for any need — whether as a home office, rental, guest house, or personal retreat. We coined “Flex-Flat” to capture the adaptability and modern essence of these spaces. Explore the Flex-Flat models
Cold-formed steel engineered for Front Range gusts and heavy mountain snow loads.
Built indoors while your foundation is poured on-site — materials never exposed to rain or snow.
From contract to completion, versus 12–18 months for a typical Colorado stick-build.
Plus 5 years on the building envelope and 2 years on systems — most builders offer just 1.
What a private, rentable Flex-Flat can fetch monthly in Colorado’s major cities.
Your home sets on its foundation in a single day — you get your backyard back almost immediately.
What Colorado homeowners tell us — open any reason for the full detail.
Unlike traditional builders who provide estimates that balloon later, our factory process allows us to give you a fixed price upfront. No surprises, no change orders.
Traditional builds take over a year. We build in the factory simultaneously while site work happens on your land.
This cuts months off the project timeline, getting you rental income or extra space months sooner.
Precision factory manufacturing ensures tighter building envelopes than site-built homes, resulting in lower heating and cooling bills year-round.
Colorado winters are harsh. Our steel-frame modules are rated for 165 mph winds and heavy snow loads.
Because they are built indoors, the materials are never exposed to rain or snow during construction.
Stop juggling architects, engineers, and general contractors. Olerra handles everything from permitting to installation under a single contract.
Two footprints, over 10,000 finish combinations — modern, factory-built ADUs delivered across Colorado.
The epitome of versatility and modern living — perfectly designed for efficiency, this space serves multiple purposes.
Best for: short-term rentals (Airbnb), a home office or gym, and tight Denver lots.
The perfect blend of functionality and luxury — spacious one- and two-bedroom layouts with premium materials throughout.
Best for: full-time living, aging parents, or a guest house.
*Starting price before installation — for a site-specific, all-in estimate, start with a free property check
See why homeowners in Colorado are choosing Flex-Flats as the smart way to enhance their lifestyle, keep loved ones nearby, and earn extra income — all without the hassle of moving or extensive renovations.
Flex-Flat ADUs add extra space — like an office, gym, or playroom — without the need to relocate, making them ideal for homeowners who love their current neighborhood.
Designed for aging parents or adult children, Flex-Flat ADUs provide a private, nearby space that supports family connection while maintaining independence.
Flex-Flats create income opportunities by offering a private, rentable unit that can fetch over $2,500 monthly in major cities.
No matter the use case, adding a Flex-Flat increases your property value while enhancing your lifestyle — extra space, family kept close, or rental income. Find out what's possible on your Colorado lot — no pressure, no obligation.
A seamless journey from concept to completion — typically 7–12 months from launch to final turnover of your new modular home.
Traditional contractors build 100% of the home in your backyard, exposing your project to weather delays, material theft, and prolonged noise. Olerra builds 95% of your ADU in a climate-controlled factory while your foundation is being poured. This ‘parallel processing’ cuts the timeline in half and guarantees a fixed price.
While the raw material costs are similar, modular saves you money on soft costs and time. Traditional builds often run 20% over budget due to labor shortages and change orders — Olerra provides a fixed-price contract.
Additionally, finishing in 7–12 months (vs. 12–18 months) saves you thousands in loan interest and gets you rental income sooner.
We don’t wait for the foundation to cure before we start framing. We build your home in our factory at the same time your site is being prepped. This concurrent schedule typically brings a 12–18 month project in at 7–12 months.
Kit homes (or ‘flat-packs’) are just pallets of parts — you still have to hire a builder to assemble them, wire them, and plumb them. Olerra modules arrive 95% complete with walls, floors, electric, and plumbing already installed and inspected. We are the builder, not just a parts supplier.
No. Mobile homes are built to the federal HUD code. Olerra Flex-Flats are built to the International Residential Code (IRC) — the exact same building code used for luxury custom homes in Denver and Boulder. They are permanent real estate.
Colorado’s fluctuating humidity and heavy snow loads can warp wood framing over time. Our cold-formed steel frames are impervious to moisture, fire-resistant, and engineered to withstand 165 mph winds and heavy snow loads, ensuring your ADU lasts longer with less maintenance.
To maintain our speed and low cost, we do not offer custom structural changes (like moving walls). However, we offer over 10,000 combinations of exterior finishes, flooring, cabinets, and fixtures, allowing you to personalize the look without the high cost of custom architecture fees.
Yes. Because we build in a factory with precision jigs, our walls are perfectly square and air-sealed, eliminating the drafty gaps common in site-built homes. Combined with spray foam insulation, this results in lower heating and cooling bills year-round.
Flex-Flats are built to last with high durability. They have steel frame construction, are resistant to fire and wind, and come with warranties: 10 years for the structure, 5 years for the building envelope, and 2 years for systems.
No. Unlike ‘kit’ sellers who leave you to figure out the foundation, Olerra acts as your turnkey partner. We manage the site prep, excavation, foundation, and utility trenching as part of our comprehensive service.
A traditional build involves 12–18 months of daily noise, dumpsters, and porta-potties in your backyard. Olerra completes the on-site foundation in a few weeks, and the actual crane installation takes just one day. You get your backyard back almost immediately.
We prefer helical piles because they are faster to install, require less excavation (less mess), and are excellent for Colorado’s shifting soils. However, we can also build on traditional concrete foundations if your specific site requires it.
We conduct a feasibility study for every project. We have successfully craned units over existing houses and navigated difficult terrain. If a crane isn’t possible, we will tell you upfront before you spend a dime.
Yes. Because Olerra Flex-Flats are attached to a permanent foundation and built to the International Residential Code (IRC), appraisers value them exactly the same as any other square footage added to your home. They add immediate equity.
We do. Permitting in Colorado can be complex (especially in Boulder and Denver). Our team handles the entire submission process, engineering stamps, and inspections, so you don’t have to navigate the bureaucracy alone.
Yes. Our units are designed to be compliant with the latest state and local ADU ordinances, including energy codes and setbacks. We verify your specific zoning allowance during our initial property check.
Yes. One of the biggest risks in construction is ‘cost-plus’ billing, where the builder charges you for every overrun. Olerra operates on a fixed-price contract for the modular unit, so you know exactly what the manufacturing cost will be before we start.
Most builders offer a standard 1-year warranty. Olerra provides a 10-year structural warranty, a 5-year warranty on the building envelope, and 2 years on systems, giving you peace of mind long after the project is finished.
No. Payments are made in milestones: a deposit to reserve your slot, a progress payment when materials are ordered, and final payments upon delivery and completion. This aligns with most construction loan draw schedules.
Start with a free property check of your lot, or book a consultation with our team — whichever fits where you are.
Built for your location and what you want to do.
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