LVL Builders • Greater Boston
Accessory Dwelling Units (ADUs)
Garage conversions • Basement / in-law ADUs • Detached backyard units
Clear scope • Code-compliant • Built by experienced subs
Why ADU Projects Need the Right Builder
ADUs are “small homes” with big code requirements—egress, fire separation, insulation, and utilities. We plan life-safety and scope from day one so the project stays predictable.
Code & Safety
Egress, fire separation, insulation, and life-safety planned from day one.
Structure & Utilities
Framing, roof work, slab cutting, trenching, and utility coordination.
Clear Scope
Written scopes and allowances so there are no surprises mid-build.
ADU Services We Offer
We build and convert ADUs with an emphasis on feasibility, permitting, and high-performance construction.
Garage Conversions
Legal studio or 1-bedroom ADUs.
Basement / Internal ADUs
In-law suites brought up to code.
Detached ADUs
Standalone backyard units.
Additions for ADUs
New square footage to support ADU layouts.
Utility Tie-ins
Water, sewer, electric, gas coordination.
Permitting Support
Align scope with the local permit path.
Typical ADU Cost Ranges
Final pricing depends on utilities, structure, finishes, and permitting.
Basement / Internal ADU
$100k+
Depending on layout & code upgrades.
Garage Conversion
$180k–$300k
Varies by structural work and utilities.
Detached ADU
$250k–$350k
Site work and utility runs are key drivers.
Prefab / Modular
$200k–$300k
Where feasible, depending on manufacturer + site constraints.
What an ADU Project Looks Like
A clear, repeatable process so owners know what’s happening and when.
-
1
Site walk & feasibility
We review layout, code constraints, and utilities before committing to a scope.
-
2
Plans & permitting
Coordinate the permit path and get the project ready to build.
-
3
Construction
Execute the scope with experienced subs and consistent project management.
-
4
Final sign-off
Punch list, inspections as required, and closeout.
Thinking About an ADU?
We’ll review your property and provide a clear written estimate.
FAQ
Common questions from Greater Boston homeowners and landlords.
Yes—feasibility is step one. We look at layout, code items like egress/fire separation, utilities, and the local permit path.
Often, yes. Water/sewer/electric capacity and routing can drive cost and schedule, especially for detached units.
Utilities, structural changes, and finish level are usually the biggest variables. Permitting complexity can also affect schedule.
Yes—garage conversions are common, but they require careful planning for insulation, slab/roof conditions, and code items like egress.
Yes. We help coordinate the permit path and align scope with local requirements.