ADU Construction
ADU Construction in the Bay Area
ADU construction services for homeowners planning additional living space, rental potential, family housing, or a more flexible property layout.
Built for additional living space
- ADU planning and scope review
- Garage and detached ADU support
- Drywall, flooring, trim, and finishes
- Interior build-out and finish work
- Clear scope and clean execution
Services
ADU construction services we can handle
Accessory dwelling units can create flexible living space for family, guests, rental use, or long-term property value. Some ADU projects involve garage conversions, while others require detached structures, interior build-out, layout planning, drywall, flooring, trim, and finish work.
ADU Planning and Scope Review
We review the existing property, intended use, available space, access, layout goals, finish expectations, and the level of construction work required.
You get:
- Clear project direction
- Better scope planning
- More practical construction expectations
Garage Conversion ADUs
Garage conversion ADUs can turn existing garage space into a more functional residential unit with finished walls, flooring, lighting, trim, and interior details.
You get:
- Garage-to-living-space planning
- Interior build-out support
- Cleaner finish integration
Detached ADU Build-Out
Detached ADUs require careful planning around layout, access, materials, surfaces, finishes, and how the new structure fits the property.
You get:
- Detached ADU scope support
- Construction sequencing
- Finish-focused execution
Interior ADU Finishes
Interior finish work makes an ADU feel like a complete living space. This can include drywall, flooring, doors, trim, cabinets, paint preparation, and final details.
You get:
- Drywall and texture work
- Flooring and trim
- Clean interior finishes
Kitchenette and Bathroom Areas
ADUs often include compact kitchen and bathroom areas where layout, tile, cabinets, fixtures, lighting, and finishes need to be planned carefully.
You get:
- Compact space planning
- Cabinet and fixture coordination
- Clean surface transitions
Full ADU Construction Support
For larger ADU projects, we help define the scope clearly so preparation, rough work, surfaces, interiors, and final details happen in the right order.
You get:
- Clear project scope
- Structured construction sequence
- Detail-focused completion
“A good ADU should not feel like leftover space. It should feel planned, finished, comfortable, and useful for the way the property will actually be used.”
Forge Construction Services
Project Direction
ADU projects we can build around
We plan around the property, the existing structure, the intended use of the ADU, and the level of finish expected. The goal is to create additional living space that feels complete and practical.
Garage Conversion ADUs
Garage-to-ADU projects that improve underused space and turn it into a more finished residential area.
Detached ADUs
Standalone accessory dwelling unit support with attention to construction sequencing, finishes, and property integration.
Rental-Focused ADUs
Additional living spaces planned around durability, function, easy maintenance, and long-term use.
Family Housing ADUs
Flexible ADU spaces for relatives, guests, long-term family needs, or additional independent living space.
Why Build an ADU
More flexibility, more usable space, and stronger long-term property value
Create additional living space
An ADU can add private living space for family, guests, rental use, or future flexibility without buying another property.
Use the property more efficiently
Many properties have space that can work harder. An ADU can turn unused or underused areas into functional residential square footage.
Support long-term value
A well-planned ADU can improve property function, rental potential, and long-term appeal when built and finished correctly.
Process
Our ADU construction process
A clear process helps define what is possible, what level of work is needed, and how the ADU should be planned before construction begins.
Consultation
We review your goals, property layout, intended ADU use, photos, measurements, and the level of project you are considering.
Property Review
We look at the existing structure, garage or lot conditions, access, layout options, utilities, surfaces, and possible limitations.
Scope Planning
We separate planning needs, rough work, drywall, flooring, cabinets, fixtures, trim, doors, surfaces, and finish details.
Estimate
You receive a scope-based estimate that reflects the actual level of work required for the ADU project.
Construction
Preparation, rough work, drywall, flooring, cabinets, tile, trim, doors, fixtures, and finish details are completed in sequence.
Final Details
We focus on cleanup, touch-ups, alignment, transitions, trim details, hardware, and the final items that make the ADU feel complete.
Ways to Work With Us
Choose the level of ADU construction support that fits your project
ADU Scope Planning
Best for homeowners who are exploring an ADU and need to understand the likely level of work before starting.
- Property review
- Scope planning
- Finish direction
- Project feasibility discussion
Garage Conversion ADU
Best for converting an existing garage into a finished residential unit or flexible living space.
- Interior build-out
- Drywall and flooring
- Lighting and trim
- Finish-focused execution
Full ADU Build-Out
Best for larger projects involving deeper planning, detached structures, compact interiors, and coordinated finish work.
- Construction sequencing
- Permit-aware planning
- Material coordination
- Full build-out support
Request Estimate
Request an Estimate
Tell us about your project and we will review the scope, location, timing, and next steps.
Permits & Cost
ADU construction cost in the Bay Area depends on size, scope, and site conditions
ADU construction costs in the Bay Area can vary significantly depending on whether the project is a garage conversion, detached ADU, attached ADU, interior conversion, or larger build-out.
Cost also depends on existing conditions, foundation or slab work, framing, utilities, drywall, flooring, cabinets, bathroom areas, kitchenette areas, doors, windows, trim, and the level of finish expected.
Permit requirements depend on the city and project scope. ADU projects can involve building, zoning, energy, utility, fire safety, egress, parking, inspection, and planning requirements depending on the property and design.
Licensed Construction Services
Licensed California Contractor
Forge Construction Services is licensed to provide residential construction, remodeling, repair, and finish work for California homeowners.
Service Area
ADU construction across the Bay Area
Forge Construction Services works with homeowners across the Bay Area and surrounding communities.
Start Your Project
Request an ADU construction estimate
If you are planning an ADU in the Bay Area, we can review your property, discuss the scope, and help you understand what level of work makes the most sense for your project.