Santa Clarita Valley

ADU & Room Additions in Santa Clarita Valley

Thoughtful planning, clear cost guidance, and full-service construction.

Overview

Planning an ADU or Room Addition

A short overview of how ADU and room addition projects are typically planned — including zoning considerations, feasibility, and construction realities.

Selected Work

Recent ADU & Addition Projects

What We Build

Expanding Your Home Requires Early Clarity

Layout and Finishes

ADU and room addition projects involve more than layout and finishes.

Site Conditions

Zoning regulations, property setbacks, utilities, and structural conditions all influence what can be built — and how much it typically costs.

Early Planning

Understanding these factors early helps homeowners plan realistically and avoid unnecessary delays.

Cost Education

Why ADU and Room
Addition Costs Vary

Project costs are influenced by several factors, including:

  • Zoning and setback requirements
  • Existing structure and foundation
  • Utility access and upgrades
  • Site access and grading
  • Size, layout, and construction type

Because no two properties are the same, reviewing cost structures before design and permitting is essential.

Two-story Santa Clarita home exterior
Cost Guide

Access ADU & Room Addition
Cost Guides

Our cost guides explain how ADU and room addition pricing is typically structured in Santa Clarita Valley — including common scope scenarios, feasibility considerations, and what drives costs higher or lower.

These guides are designed to help homeowners plan before committing to design or construction.

Boulder Builders ADU and room additions cost guide cover

Access the Cost Guide

Understand typical ADU and room addition cost structures, scope options, and feasibility considerations.

Only used if clarification is needed.

We don't share contact information or send unsolicited marketing.

Why Homeowners Work With Us

A Clear, Professional Approach

Experience navigating zoning and permitting

Clear planning before construction begins

Licensed California general contractor

Process

How ADU and Addition Projects Typically Progress

  1. 01

    Early conversations focus on feasibility, zoning, and site conditions.

  2. 02

    Planning and design clarify layout, structure, and utility requirements.

  3. 03

    Permitting is coordinated before construction begins.

  4. 04

    Construction is managed with attention to sequencing, inspections, and communication.

All work is performed by a licensed and insured California general contractor.

Projects are executed by the operating company, Boulder Builders, in accordance with local and state regulations.

"They walked us through feasibility before we ever talked design. That clarity made all the difference."

Homeowner — Valencia
Contact

Book Your Complimentary
Consultation

If you'd like to discuss feasibility, scope, or next steps, our team is available to walk through your goals.