#1 ADU Builder around Solano County

Think it! Speak it! Build it.

At Leon Construction, we specialize in transforming your property into a high-value asset. Building an ADU is a strategic investment, and our approach is built on structural certainty and permit efficiency.

We handle the complexity of California regulations, from complex zoning laws to detailed structural requirements, ensuring your project is completed faster, built to last, and ready to generate income.

Our commitment goes beyond aesthetics; we prioritize sustainability and robust construction. Our process blends smart design with specialized technical execution—guaranteeing your new unit is energy-efficient, aesthetically pleasing, and structurally superior from the foundation to the roof truss.

Based in Vacaville, CA, we are experts in navigating the permitting processes across various local jurisdictions. Join us to redefine your property's potential.

WHY LEON CONSTRUCTION? (Our Core Power)

  • CA Permit Speed: Leverage our pre-approved ADU plans and deep local code knowledge to significantly cut months off the permitting timeline. We get your project approved faster.

  • Structural Mastery: Guaranteed durability. We are specialists in foundations, framing, and load-bearing systems—the most critical part of your new investment.

  • Cost Predictability: Our integrated Design-Build knowledge ensures we provide clear, realistic budget certainty and transparent pricing before construction begins.

A collage of four images related to construction and planning. The first shows three construction professionals reviewing plans on a construction site. The second depicts a cartoon-style illustration of a house, a parked camper, and a car with a park sign, set in a wooded area. The third features a close-up of a finance document with a focus on the word 'Finance,' surrounded by icons of financial concepts. The fourth shows three people sitting at a table discussing documents and a laptop.

Your Vision, Our Expertise: The Fully Customizable ADU Floor Plan Collection

Joint ADU

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Junior ADU

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Garage Conversion

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Detached ADU

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Luxury ADU

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ADU home

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Joint ADU 〰️ Junior ADU 〰️ Garage Conversion 〰️ Detached ADU 〰️ Luxury ADU 〰️ ADU home 〰️

748SF ADU

aspen

Experience the perfect balance of space and efficiency with our 748 square foot "Aspen" ADU. This thoughtfully designed floor plan proves you don't have to compromise comfort in a smaller footprint. At 748 sq ft, it offers ample room for a generous bedroom, a full kitchen, a comfortable living area, and a functional bathroom. It’s an ideal, versatile solution, loved by so many happy customers for generating rental income or housing family. Explore the layout and see how easily this permitting-approved design can be fully customized to fit your vision and lifestyle.

Floor plan of a small house with labeled rooms: dining area, kitchen, living room, bathroom, and bedroom

oasis

Discover truly efficient living with the 595 square foot "Oasis" ADU—the ultimate design for maximum function in a compact space. This 1 Bed / 1 Bath plan is meticulously laid out to feel spacious, making it the perfect private retreat or high-demand rental unit. Built on the principle of flexible design, the "Oasis" is structured to keep your project in budget and on time. See the layout that so many homeowners trust, and start customizing this pre-approved plan to create your perfect backyard escape.

Floor plan of a small apartment with labeled areas: bathroom, sleeping area with bed and nightstands, living area with sofa and coffee table, and kitchen with island and appliances. Dimensions are 22 feet by 22 feet.

Apollo

Meet the 499 square foot "Apollo" ADU: the fastest way to add value and living space to your property. Hitting the smallest, most efficient footprint, the "Apollo" is a favorite for its budget-friendly construction and ability to fit nearly any lot. This design is focused on quick delivery and is ready to be customized to your needs, whether you need a dedicated office or a cozy guesthouse. With our permitting-approved plans and flexible options, the "Apollo" proves that adding a highly livable unit can be done on time, in budget, and with confidence.

Interior of a modern kitchen being renovated, showing wood-like tile flooring, white cabinets, a blue accent wall, and a ceiling fan.
Single-story house with gray exterior and wooden deck, palm and evergreen trees, cloudy sky
Room with modern fireplace, white built-in shelves, wooden flooring, and ceiling fan. Person working near cabinet.
Interior of a modern living room under renovation with wood-style tile flooring, ceiling fan, built-in fireplace, French doors, and step ladder. Plastic covers some areas for protection.
Person using a wall lift tool to position a large wood panel in a partially constructed wooden framework, with building materials scattered around the site.
Exterior view of a house under construction with wooden framework, scaffolding, and construction materials on site.
Construction workers building a wooden frame structure with beams and posts on a concrete surface, tools scattered around, outdoor setting.
Modern kitchen with white cabinets, geometric tile backsplash, island, and wood-look flooring.
Modern kitchen with white cabinets, stainless steel appliances, and patterned backsplash
Backyard scene with a covered patio, stepping stones leading to a grassy area, and a play structure. The patio has a wood-beamed roof and French doors.
Small beige house with blue door, patio with blue chairs, potted plants, and a person walking on the stone-textured ground.
Kitchen with marble countertop, geometric tile backsplash, stovetop, and white cabinetry.
Modern bathroom with glass shower, rectangular sink, round mirror, and dark cabinetry.
Modern walk-in bathtub with gray tile walls and decorative tile accent, featuring a handheld showerhead and contemporary faucet.
Man working in bathroom with walk-in bathtub
Modern kitchen with white cabinets, stainless steel appliances, and wood flooring
Modern kitchen with stainless steel appliances, white cabinets, and hardwood floors
Backyard construction site with wooden formwork for concrete slab, surrounded by grass and fences, adjacent to a neighboring house.
Small wooden shed under construction in a backyard with an open door and construction materials scattered around.
Modern kitchen with wood flooring, white cabinets, stainless steel appliances, and pendant lighting.
Construction worker building a wooden roof structure on a residential home.
Kitchen under renovation with worker tiling backsplash, covered white cabinets, tools, and materials.
Modern kitchen with wooden floor, white cabinets, stainless steel appliances, and recessed lighting.
Modern kitchen with white cabinets, stainless steel appliances, pendant lighting, and wood flooring.
Interior framing of a house under construction, featuring wooden studs, exposed beams, and wiring. A person is standing on a ladder working on the electrical installation.
Plumber installing outdoor tankless water heater with assorted pipes and fittings
Outdoor patio with wooden posts, sliding glass doors, and a gravel pathway with stepping stones leading to the entrance, under a clear blue sky.
House interior under construction with exposed wooden framing, tools, and materials scattered on the floor.
Residential construction site with framed foundation and exposed wooden studs, house expansion in progress.
Interior view of a wooden building under construction with visible studs, roof trusses, and flooring joists. A person is working on constructing the floor, surrounded by tools and materials.
Wooden house construction interior with visible beams, plywood flooring, ladder, and tools.
Interior of a house under construction, showing exposed wooden framing and unfinished plywood floors.
House under construction with unfinished roof and wooden framework, dirt foreground, blue sky background.
Interior view of a house under construction, showing unfinished wooden framing, plywood walls, ceiling joists, and large windows. A stack of doors is visible leaning against a wall.
Interior view of a wooden-framed room under construction with unfinished walls, exposed wooden beams, and a concrete floor.
Interior view of a building under renovation with exposed wooden beams and framework, unfinished walls, windows leaning against the wall, and construction equipment such as a ladder.
Interior view of a house under renovation, showing exposed wooden beams and framing, along with construction materials and tools.
Construction worker on a roof performing a home renovation with ladders and scaffolding visible.
Roof construction with exposed wooden beams and tools, partially completed, houses and trees in the background.
Framed wooden structure under construction with open roof and exposed beams, featuring wooden walls, a table with plywood sheets, and construction tools on concrete floor, surrounded by trees.
Exterior view of a house under construction with a textured stucco finish, ladders, plastic covering on the ground, and a balcony with a striped tarp covering.
Back of a house under construction with plywood walls, scaffolding on the side, and concrete slabs on the yard.
Construction site of a two-story house with a partially built patio and scaffolding, sunlight, and clear blue sky.
Modern kitchen with white cabinets, stainless steel appliances, wooden flooring, and a window above the sink.
Two construction workers building the wooden frame of a house, with tools, ladders, and wood panels visible, under a partly sunny sky with trees in the background.
Modern bathroom with a glass-walled shower, white textured tiles, a small rectangular window, a black vanity with a white countertop, a rectangular vessel sink, and a round mirror.
Kitchen with white cabinets, patterned black and white backsplash, wood-like floor, and some construction tools and supplies on the island.
A person standing outside a small beige house with blue chairs on the concrete patio, working on a home improvement project, with trees and a clear blue sky in the background.
Backyard of a house with patio furniture covered in protective covers, a ladder leaning against the wall, and some scaffolding on the second floor, during sunset.
Worker pouring concrete on a freshly laid foundation for a backyard patio, with a house and another building under construction in the background.
A construction worker in a high-visibility yellow shirt and cap is compacting gravel on a walkway next to a house with gray textured exterior walls. The site is enclosed with a wooden fence, and there are construction tools and materials in the backg
Construction worker operating a saw on a wooden construction project outside a house, with wooden beams and a concrete patio under a sunny sky.
Interior wall with wooden paneling and visible electrical outlets behind a black leather chair with a green table in front.
A person installing a wooden fence in a backyard during sunlight, with trees in the background, some wood planks and tools on the ground.

Participating locations

Illustration of a classical building with three columns and a pediment, representing the City of Benicia, California.
Seal of the City of Suisun City, California, featuring a sailing ship on water with a blue and gold circular border.
Seal of the City of Dixon, California featuring a tree and farmland with a city skyline in the background.
A landscape logo featuring mountains, trees, a field, and a bright sun with rays, with the text 'VACAVILLE' at the bottom.
Seal of Solano County featuring a Native American figure, a landscape with farmland, rivers, and hills, and symbols of transportation, with the name 'Solano County' and the year 1850.
Seal of the city of Rio Vista, California, featuring an oil rig, a fish, a bundle of wheat, a gear, a lighthouse, and a bridge, with the inscription 'The City of Rio Vista, California' and 'Incorporated Dec. 30, 1893'.
Logo of the City of Vallejo, California, featuring a green tree, a blue sailboat, and stylized land and water elements with the text 'City of Vallejo California'.
Four illustrated scenes representing Fairfield: a mountain with a sun and green fields, two people holding hands at sunset, an airplane flying over a building, and a cityscape with a river and trees.

And 30 other locations near you…