Three pre-designed floor plans. Three quality tiers. Five architectural styles. Fixed pricing, professional design included, and no surprises from first sketch to move-in day.
↗Check if your property qualifies. Use the property finder.
Every plan is a detached ADU built to Longmont code. All include exterior bike storage, a weatherproof outdoor storage cabinet, abundant natural light, and open floor plan design.
360 SF · 20' x 18'
Ideal for
450 SF · 22.5' x 20'
Ideal for
750 SF · 30' x 25'
Ideal for
Three quality tiers — same structure, different finishes. The Great tier is our most popular choice.
All specifications are preliminary and subject to change as plans are finalized.
Five architectural styles, each available across all three tiers. Premium uses authentic materials; Great uses quality simulations; Good achieves the style through form and proportion with simpler materials.
Board-and-batten fiber cement siding, stone veneer accents, generous roof overhangs with exposed rafter tails on Premium. Large windows with black or dark bronze frames.
Exterior palette
Natural wood tones, charcoal/graphite gray, warm whites, earth tones
Interior character
Warm neutrals, wood ceiling details on Premium, natural wood-look flooring, matte black or oil-rubbed bronze fixtures
broad Colorado appeal, all tiers, works everywhere
Horizontal lap siding with cedar shake accents in gables on Premium. Wide trim boards, tapered porch columns, low-pitched gable with wide overhangs and decorative brackets.
Exterior palette
Sage green, warm browns, creams, earth tones
Interior character
Substantial woodwork and trim, shaker cabinetry in natural wood or painted, mission-style lighting, warm neutral palette
traditional neighborhoods, multigenerational living, timeless appeal
Clean lines, minimal ornamentation, and a focus on light. Vertical or horizontal smooth-finish siding, simple gable forms, oversized windows, and restrained detailing that lets materials speak.
Exterior palette
White, light gray, soft black, natural wood accents, matte finishes
Interior character
Light wood tones, white walls, minimal trim, functional built-ins, natural textiles, brushed or matte hardware
modern sensibility, light-filled spaces, minimalist living
Contemporary forms softened with natural materials. Flat or low-slope rooflines, mixed cladding (metal panel + wood or cement board), large-format windows, and warm tones that keep it approachable.
Exterior palette
Warm gray, charcoal, cedar or wood-tone panels, bronze or black metal accents
Interior character
Open ceilings, exposed structure on Premium, warm wood + concrete or quartz surfaces, integrated lighting, matte black or brass fixtures
design-forward homeowners, urban lots, contemporary neighborhoods
The farmhouse silhouette — steep gable, board-and-batten siding, covered porch — updated with cleaner lines and modern proportions. Metal roof, black-frame windows, and a restrained color palette.
Exterior palette
White or off-white siding, black windows and trim, natural wood porch details, dark metal roof
Interior character
Shiplap accent walls, shaker cabinets, open shelving, farmhouse sink, warm wood floors, black iron or brushed brass hardware
rural and suburban lots, family-oriented, broad neighborhood compatibility
Available at any tier. Pricing varies by plan and configuration.
Your ADU investment depends on plan size, quality tier, and site conditions. Here's where our projects typically land:
Good
Starting in the low $100s for studios, scaling with size
Great
Mid $100s to mid $200s
Premium
Mid $200s to mid $300s for the full experience
Included in your price
✓Architectural design and engineering
✓Permitting management
✓All construction and materials
✓Project management from start to finish
Varies by site
↔Utility connections (depends on distance to mains)
↔Site grading and access (depends on lot conditions)
↔Demolition of existing structures (if applicable)
↔Landscaping restoration
Every lot is different.
Check your property with our free ADU Finder, or contact us for a personalized project estimate.
Every Addwell ADU uses the same proven construction approach — designed for quality, speed, and long-term performance.
Panelized construction
Walls and roof panels built offsite for quality control and faster on-site install.
Slab-on-grade foundation
Lower cost, better air sealing, and simpler construction than crawlspaces.
Standing seam metal roof
50+ year life, maintenance-free, fire-resistant, and solar-ready — on every unit.
PEX manifold plumbing
Faster install, fewer joints, and easy long-term maintenance.
Maintenance-free exteriors
Fiber cement, metal roofing, and composite trim across all tiers.
Pre-approved engineering
Structural engineering pre-approved for streamlined permitting.