Plans & Existing Conditions
Review approved plans, accessible prior work, jurisdiction requirements and project-specific corrections.
ADUs · Garage Conversions · Room Additions
ADU & Garage Conversion Contractor
Coordinated ADU and garage conversion construction for homeowners in Riverside, Moreno Valley, Corona and surrounding communities—from plan review and structural work through utilities, finishes and final inspections.
A complete construction scope
A small building still requires full-size coordination.
An accessory dwelling unit combines structural, plumbing, electrical, HVAC, energy and finish requirements in a compact footprint. The success of the project depends on sequencing those systems correctly.
Matamoros Construction Inc. works from the approved documents, reviews accessible existing conditions and coordinates the remaining trades and inspections required to move the project toward completion.
Every proposal identifies project-specific inclusions, exclusions, allowances and permit responsibilities.
Typical project scope
From site work to final finishes.
Final work is based on existing conditions, approved plans when applicable, and your written construction agreement.
Structure & Building Envelope
Foundation or slab work, framing, shear, roofing, windows, exterior assemblies and weather protection.
Plumbing, Electrical & HVAC
Underground and rough systems, panels and service coordination, all-electric equipment and required testing.
Insulation & Interior Finish
Insulation, drywall, texture, interior doors, flooring, cabinetry, paint, fixtures and trim.
Inspections & Corrections
Coordinate applicable inspection milestones and complete work within the contracted scope to address corrections.
Final Completion
Finish details, startup, cleanup, walkthrough and closeout of the construction scope.
Projects we can evaluate
ADU projects with different starting conditions.
The scope changes depending on whether the new living space is detached, attached, converted from a garage or already under construction.
Detached ADUs
New independent living space with coordinated foundation, utilities, structure, envelope, kitchen, bathroom and finishes.
Attached ADUs
Living space connected to the main residence with careful attention to structural, fire-resistance, utility and access requirements.
Garage Conversions
Existing garage space evaluated for slab, framing, openings, utilities, insulation, energy and life-safety requirements.
Completion & Corrections
Previously started projects reviewed against approved plans, accessible conditions, permit history and inspection status before a completion scope is offered.
Primary service area
Riverside, Moreno Valley & Corona
We prioritize permitted ADU and garage-conversion projects in Riverside, Moreno Valley and Corona. Larger, plan-ready projects in San Bernardino, Rancho Cucamonga and surrounding areas may also be evaluated.
Selected project work
ADU construction from foundation to finish.
Real field photos showing structural preparation, framing and completed living space.
Foundation formwork, reinforcement and underground coordination before concrete placement.
Framing and rough-in phase with structure and building systems coordinated together.
Exterior lath and stucco base-coat phase coordinated around windows, doors, roof edges and penetrations.
Completed interior with flooring, paint, trim, lighting and finish details.
Permit-aware construction
Approved plans guide the build. Field conditions shape the sequence.
Garage conversions and partially completed ADUs need careful review. Concealed or previously completed work cannot be assumed compliant until it is documented or accepted by the authority having jurisdiction.
- Framing, shear and roof inspection planning
- Electrical service and utility coordination
- Plumbing, shower pan and mechanical milestones
- Energy, fire-resistance and drywall requirements
Common questions
What homeowners ask before starting.
Does an ADU or garage conversion require permits?
Yes, these projects generally require approved plans, permits and multiple inspections. Requirements vary by city, property and scope.
Can you complete work started by another contractor?
Potentially. We first review the approved plans, accessible conditions, permit history and inspection status. Concealed or unapproved work may require additional investigation or correction.
How long does construction take?
The schedule depends on the size, existing conditions, plan status, utility work, inspection availability and finish selections. The proposal will identify an estimated construction duration for the defined scope.
Are permit fees and utility upgrades included?
Only when specifically listed. Permit fees, design services, utility charges and major service upgrades are identified separately in the written proposal.
Ready to discuss the work?
Bring us your idea, photos or approved plans.
We will review the project information and determine the right next step for an accurate proposal.