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HOUSE PLANS BUILT FOR THE LOTS OTHERS IGNORE.

Architect-designed plans for infill lots, narrow sites, ADUs, and urban small lots. Permit-ready documents. Instant download

Permit-Ready Sets

Every plan includes full construction documents drawn to IRC standards, ready for local permit submission with few modifications.

Designed by Architects

Every plan on this website is designed by Derek Metson, AIA, Principal at Greenbox Architecture. He is an award-winning architect with over 20 years of experience.

Instant Digital Download

Purchase once and download a complete, print-quality PDF or CAD plan set immediately, no wait, no shipping.

WHAT IS INFILL DEVELOPMENT?

The Smart Way to Build in an Established Neighborhood.

An infill lot is a vacant or underutilized parcel sitting within an already-developed urban or suburban area. Building on these sites adds housing where infrastructure already exists, without sprawl, without long commutes, and without sacrificing the character of the surrounding neighborhood.

The challenge is that infill lots are rarely cookie-cutter. They're narrow, irregular, steeply sloped, or oddly shaped. Standard plan books don't work. Our plans do.

THE PROCESS

Three Steps From Plan to Permit

STEP 1

01

Browse our plans and find one that meets your needs and fits your site. Plan sets are designed to be clear legible and bring creativity to each building.

STEP 2

02

Purchase the plan set that fits your site. You'll receive a full-resolution PDF package or CAD Files — immediately, at checkout.

STEP 3

03

Verify compliance with local codes. Submit the documents to your local building department. Our plans are drawn to IRC standards to streamline the permit process.

Resources for InfillBuilders

Setbacks, FAR, and Lot Coverage: Zoning Terms Every Infill Builder Needs to Know
Setbacks FAR lot coverage zoning

Setbacks, FAR, and Lot Coverage: Zoning Terms Every Infill Builder Needs to Know

Introduction If you're planning to build on an infill lot, understanding zoning terminology is essential...
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The Infill Lot Feasibility Checklist: 10 Things to Verify Before You Build
infill lot feasibility checklist

The Infill Lot Feasibility Checklist: 10 Things to Verify Before You Build

Introduction Buying an infill lot can be an incredible opportunity — but only if the...
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ADU Rules by State: What You Need to Know in 2025
ADU rules by state 2025

ADU Rules by State: What You Need to Know in 2025

Introduction Accessory Dwelling Units (ADUs) continue to grow in popularity across the United States as...
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Sample Plan Set

Preview our architectural plans before purchasing. Standard plan sets typically include 8–16 24" x 36" sheets, including floor plans, reflected ceiling plans, sections, details, foundation plans, wall and roof framing plans, door and window schedules, framing and fastening notes, energy compliance information, and a conceptual electrical layout.