Room Addition Plans

How Much Does It Cost?

Cost is always a big question—and the honest answer is, it varies. The size, complexity, and site conditions all play a role. But we keep pricing simple and transparent.

While many architects charge 4–7% of the total construction budget, we offer flat-fee pricing based on project scope. That means no surprises and no inflated fees.

What Affects the Cost?

Several factors influence the overall design and engineering cost of your Room Addition:

• Location: Local regulations, permitting requirements, and jurisdictional nuances can all affect design scope and cost.

• Size: Bigger additions mean more detail and coordination.

• Project Type:

- Single-Story Additions are typically more straightforward

- Two-Story or Over-Garage Additions require more structural work.

- Special Rooms like kitchens or offices often involve more utility planning.

• Construction Methods: Unconventional or high-efficiency construction techniques can add to the design effort.

• Site Conditions: Sloped or uneven lots may require more engineering and site planning.

What’s the Price Range?

Here’s a general breakdown of what to expect:

• Smaller, simpler additions – $7,000–$15,000

• Larger or complex additions – $15,000–$25,000+

These ranges reflect full-service building design and structural engineering, including what’s needed to get your plans permit-ready (except site studies like survey, etc., civil and MEP engineering).

Getting an Accurate Estimate

Every property and project is different. That’s why the best way to get a clear cost estimate is to book a consultation. We’ll review your goals, site details, and timeline—and provide a tailored proposal that reflects the real scope of your project.

Timeline & What You’ll Get

When planning your Room Addition, it helps to know what to expect—both in terms of how long it’ll take and what’s included. At QuickenPlans, we strike the right balance between speed and quality, delivering thoughtful, permit-ready plans without unnecessary delays.

How Long Does It Take?

The design process is a collaborative effort. While we keep things moving on our end, timely feedback and decisions on yours play a big role in staying on schedule. Here’s a general idea of the timeline:

• First Concept Design:

After your design kick-off meeting, we’ll deliver your first concept iteration within 10–15 business days. This is the first time you’ll see your vision start to take shape.

• Full Design & Engineering:

From initial consultation to final deliverables, most projects are completed in 2–4 months—as long as there’s steady communication and prompt feedback throughout. Delays in approvals or decision-making can naturally extend the timeline.

What’s Included?

Deliverables may vary slightly based on your local regulations, but here’s what’s typically included in a full custom Room Addition plan set:

• Site Plan – A layout showing the addition’s placement in relation to property lines and existing structures.

• Floor Plan – Interior layout with room dimensions, doors, windows, and fixtures.

• Elevations – Exterior views from all sides, showing windows, rooflines, and finish details.

• Sections – Cross-sectional views that show how different levels and spaces relate.

• Roof Plan – Roof design with slopes, materials, and any skylights or special features.

• Basic MEP Layout – Placement of visible Mechanical, Electrical, and Plumbing fixtures.

• Construction Details – Key details like wall assemblies, connections, etc.

• Structural Drawings & Calculations – Foundation, framing, and structural specs, prepared and stamped by one of our in-house licensed engineers, ready for review by building officials.

• Energy Compliance Report – Required in many areas, this ensures your Room Addition meets current energy efficiency standards.

Let’s Make It Happen

We make expanding your space simple. With thoughtful design, clear timelines, and expert support, we’ll help bring your room addition plans to life.