Room Addition Plans
More Space, Same Address
You don’t need to move to live better. Whether it’s a growing family, a new office, or the dream kitchen you’ve always wanted, a room addition can unlock a whole new chapter in your current home. With careful planning and expert design, we make it feel like your home always had this extra space.
From expanding single rooms to adding entire second stories, we approach every addition with structural precision and seamless integration. That means your new space doesn’t just function well—it flows naturally with your existing home, inside and out.
We take the guesswork out of feasibility, zoning, and design so you can focus on possibilities. Let’s reimagine your home—without starting over.
Process, Pricing and Timeline
Design & Permitting Process
1. Site & Structure Review
We begin by evaluating your home’s existing conditions—foundation, framing, rooflines, utility access, and zoning regulations. This allows us to determine the most practical and cost-effective approach to your addition. We also identify any structural or code-related limitations early, so your project starts on solid footing.
2. Vision & Use-Case Discovery
Next, we collaborate with you to define the purpose and goals of your addition. Whether it’s a primary suite, home office, sunroom, or expanded kitchen, we explore layout options and usage scenarios. From there, we align your ideas with applicable building codes, lot restrictions, and lifestyle needs to create a plan that makes sense.
3. Integrated Design Concepts
Our design team develops preliminary layouts that seamlessly integrate the new space with your existing structure. This includes architectural style matching, layout optimization, and smart space planning. We’ll iterate on design drafts with your feedback to ensure both function and aesthetic flow are thoughtfully addressed.
4. Engineering & Construction Documentation
Once the design is approved, our structural engineers step in to provide foundation, framing, and load calculations. We also handle Title 24 energy compliance documentation and other technical requirements. The result is a fully coordinated permit-ready plan set—complete with all construction and structural details.
5. Permitting Assistance
We assist you or your permit runner with city submittal, and we’re on standby to address any plan check comments or revisions requested during the review process. Our team communicates directly with officials to help streamline approvals and avoid delays.
6. Builder Support
Even after the permits are issued, we remain available during the construction phase. Whether your contractor has questions about layout details or encounters unexpected site conditions, we’re here to provide clarifications, engineering updates, or minor design adjustments—ensuring your addition is built exactly as intended.
What Does It Cost to Design a Room Addition?
Cost is one of the first things people ask—and the reality is, there’s no one-size-fits-all answer. The total price depends on several factors, but our goal is to keep things as straightforward and predictable as possible.
Unlike firms that charge a percentage of your build cost, we offer clear, flat-rate pricing based on your project’s specific scope and requirements. You’ll know exactly what to expect before we start—no surprises, no hidden fees.
What Impacts the Total Design Cost?
Several elements influence the design and engineering cost of your room addition:
- Project Location – Local building codes, zoning rules, and review processes can vary significantly by city or county.
- Addition Size – More square footage usually means more design hours, structural work, and permit coordination.
Type of Addition –
Single-level additions are generally more straightforward.
Two-story builds or over-garage expansions involve added structural considerations.
Functional spaces like kitchens, bathrooms, or home offices may require more utility and layout planning.
Construction Approach – Innovative systems, eco-friendly upgrades, or specialty construction methods may require additional detail and coordination.
Site Characteristics – Grading challenges, slopes, or tight access can add complexity to the planning process.
Typical Price Ranges
To give you a general idea:
- Basic single-room additions – $7,000–$15,000
- Larger or multi-room additions – $15,000–$25,000+
These estimates include architectural design, structural engineering, energy code compliance, and permit-ready documents. Surveying, civil engineering, or utility planning (if needed) are additional services.
Want a Clearer Estimate?
No two properties are the same, and neither are our plans. Schedule a free consultation, and we’ll provide a personalized quote based on your property, goals, and timeline.
A Clear Process with Real Deliverables
Adding space to your home is a big investment—and knowing what to expect makes the journey much smoother. Our process is designed to balance creativity with efficiency, so you get high-quality, permit-ready plans without dragging timelines or unclear deliverables.
How Long Does It Take?
The timeline can vary depending on project size, permitting jurisdiction, and the pace of client feedback. Here’s a general outline of how things move:
Concept Design Phase
Within 10–15 business days of your kick-off meeting, we’ll present the first draft of your layout. This concept brings your vision to life and sets the direction for refinements.
Plan Development & Engineering
Once the layout is approved, we move into detailed design, structural calculations, and energy documentation. Most addition projects reach the final plan set stage within 2–4 months. Delays can occur if city departments require revisions or if decisions are postponed, but we work proactively to keep things on track.
What’s Included in Your Plan Set?
Your final plan set will be complete and ready for submission to your local building department. Here’s what it typically includes:
- Site Plan – Shows the addition’s location relative to property lines, setbacks, and existing structures.
- Floor Plan – Interior layout with dimensions, room names, door/window placement, and fixture callouts.
- Exterior Elevations – Views from all sides that reflect the final look of your home, including materials and finishes.
- Building Sections – Vertical cutaways showing how new spaces connect to the existing structure.
- Roof Plan – Roof slope, type, drainage, penetrations (like skylights), and integration with existing rooflines.
- Basic MEP Layout – General layout of mechanical, electrical, and plumbing fixtures to guide installation.
- Construction & Connection Details – Framing, wall assemblies, and how new elements tie into existing construction.
- Structural Drawings & Calculations – Professionally engineered foundation and framing plans, stamped and ready for review.
- Energy Compliance Documentation – Required reports (like Title 24 in California) to demonstrate your addition meets local energy efficiency standards.
Let’s Build It Right From the Start
We believe that well-designed plans are the foundation of a smooth construction process. With clear communication, quality documentation, and expert support from day one, we’ll help you confidently move from idea to approved plans—ready for the builder to take over.