Whether you’re adding a family room, master suite, or home office space, our plans prioritize smooth roof transitions, structural integrity, and code compliance. We stay involved through permit submittal and corrections, so you can focus on construction while we handle the design and approvals.
Room addition design and engineering pricing options
0-400 sqft. Room Additions
Pricing: $7,500+
Includes architectural design, structural engineering, roofline integration, foundation details, permit-ready drawings. 2 revisions + 1 city correction round.
401-1,000 sqft. Room Additions
Pricing: $14,000
Includes architectural design, structural engineering, roofline integration, foundation details, permit-ready drawings. 2 revisions + 1 city correction round.
Common add-ons and third-party consultants
Topography & Engineering
- Boundary & Topographic Survey: $2,500 (Boundary) / $3,500 (Topo + $600 Slope Band)
- Soils / Geotechnical Report: $5,000–$7,000
- Civil Engineering / Drainage: $1,500–$3,500
Fire Protection & Utilities
- Local Fire Department Review: Included in any package
- Fire Sprinkler Design: $1,500–$3,500
- Utility Upgrades / Trenching: Project Dependent
HOA & City Permits
- Coastal Commission / Hillside: Project Dependent
- HOA Coordination: $750–$2,500
- Additional City Correction Rounds: $750–$2,500
The process
Our room addition design & engineering process
Initial concept
Our first meeting focuses entirely on listening to your project goals, client needs, site constraints, and timeline priorities. We review zoning requirements, setbacks, height limits, and any local ordinances to confirm feasibility and identify the best addition strategy. This collaborative step establishes clear objectives and prevents costly revisions later.
Schematic design
We develop initial layouts, floor plans, and elevations based on our discussions. Options explore efficient space use, natural light, flow with the existing home, and aesthetic integration. We present concepts that balance functionality with compliance, providing visual previews to align with your bids and client expectations.
Drawing and specification documentation
Detailed architectural plans take shape, coordinated with structural engineering for foundations, roof framing, shear walls, and load paths. We integrate Title 24 energy calculations, plumbing/electrical layouts, and energy notes. Every drawing includes precise dimensions, construction sequencing notes, and life safety details to support easy permitting and field execution.
Construction coordination and management support
We prepare complete permit-ready sets and submit on your behalf where possible. During plan check, we manage city comments, provide clarifications, and handle revisions promptly—keeping momentum high and avoiding delays that impact your schedule.
Final touches and approval
We finalize all documents, confirm full compliance, and deliver polished sets ready for your build team. The result is more than approved plans—it’s a reliable foundation that reduces change orders, protects your margins, and sets up successful room addition deliveries.
Our commitment to excellence
Superior Design
Our licensed team creates precise, buildable plans with attention to detail and real-world constructability.
- Thorough zoning and code analysis upfront
- Builder-friendly details for framing and sequencing
- Impressive visuals for client presentations
High-Quality Compliance & Coordination
Every plan meets California standards, including Title 24 and local requirements.
- Integrated structural, energy, and MEP coordination
- Built-in revision and correction support
- No percentage-based fees—flat-rate transparency
Investment Value for Your Projects
Our efficient process helps you win more bids and scale ADU work profitably.
- Faster approvals to keep schedules intact
- Reduced change orders and field surprises
- Partnership that grows with your business
Best designers for ADUs
Our experienced architects and engineers work collaboratively from initial review through final approvals. We understand contractor realities—tight timelines, budget constraints, and the need for clear, field-ready plans—so we deliver documents that make your execution straightforward and reliable.