Home Addition: The Complete Guide for Homeowners (2025)
A home addition adds permitted square footage to your house. Covers 8 types, costs from $5K–$500K, permit requirements, what drawings you need, and how to plan it.
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Architectural Design Services
Say goodbye to expensive local architects, unreliable freelancers, and 3-month wait times. Get permit-ready construction drawings for your ADU, garage conversion, or home addition — starting at $997.
Free Consultation
Plans Produced With Industry-Standard Software
Why Clients Choose Us
We offer a 14-day money-back guarantee, no questions asked.
While you sleep, your drawings are being refined. We operate across time zones so your project never sits idle overnight.
No hourly billing. No discovery fees. No surprise invoices. You know exactly what you'll pay before a single line is drawn.
50+ projects delivered across 7 states with a 98% first-submission permit approval rate. We've built the process so you don't have to wait.
Every project gets a dedicated design coordinator who responds within 4 business hours. No ticket queue, no chatbot.
The Problem With Local Architects
For a project that doesn't require a licensed architect in most US states. You're paying for their office, their overhead, and their hourly rate, not the drawings.
Local design firms are backlogged. Every week you wait is a week your project isn't breaking ground, and construction costs keep rising.
ADUs, garage conversions, and home additions in most US jurisdictions only require stamped construction drawings, not a full architectural engagement.
What We Build
Complete permit-ready construction drawings for Accessory Dwelling Units: detached, attached, or garage conversion ADUs.
Transform your existing garage into a livable space (studio, bedroom, home office, or full ADU) with permit-ready drawings.
Add square footage to your home with a room addition, second story, or bump-out. Full structural and construction drawing package.
Our Methodology
You share your site details, measurements, and design preferences via our intake form. We review local zoning and setback requirements for your jurisdiction within 24 hours.
Your dedicated design coordinator develops the floor plan, elevations, and construction details using AutoCAD and Chief Architect. You receive a draft for review by Day 5.
Up to 2 rounds of revisions included. Your coordinator responds to change requests within 4 business hours. Every concern is addressed before final delivery.
Your complete construction drawing set is delivered as stamped PDF files, ready for building department submission. We support permit application questions at no extra cost.
Featured Work
A selection of completed construction drawing sets delivered to homeowners across the US.
Transparent Pricing
Every package includes 2 revision rounds, coordinator support, and permit-ready PDF delivery.
Starter
Garage conversion or simple floor plans
Standard
Most PopularADU or home addition full drawing set
Premium
Full package + 3D renders + rush delivery
Client Results
"I got quotes from 3 local architects — the lowest was $11,200. Build With A Plan delivered the same permit-ready drawings for $1,997. My permit was approved first submission. I saved over $9,200."
"The garage conversion drawings came back in 8 days. My contractor was impressed with the level of detail. We broke ground 3 weeks after I placed the order. Architects quoted me $7,500 — I paid $997."
"We added a 400 sq ft master suite. I was ready to spend $14,000 on a local architect. Build With A Plan handled everything — full structural plans, MEP drawings, permit support — for $2,997. Worth every penny."
5-Star Reviews
Permit Approvals
Construction Docs
Digital Precision
Common Questions
Local architects typically charge $5,000–$15,000 for the same permit-ready drawings we deliver for $997–$2,997, and their timelines average 8–14 weeks. Our team produces the same CAD and construction document output, at a fraction of the cost, in 10 business days. Many of our clients show up to their contractor with drawings their local firm couldn't match at any price.
In most US jurisdictions, ADUs, garage conversions, and home additions do not require the stamp of a licensed architect — only permit-ready construction drawings. Our drawings are produced by experienced architectural designers and are accepted by building departments in California, Texas, Arizona, Florida, Oregon, Washington, Colorado, and more.
Standard delivery is 10 business days from the day you complete your intake form and submit your site measurements. Day 5 is your first draft review. Days 6–8 are your revision window. Day 10 is final delivery. Premium clients receive a 5-day accelerated timeline.
Our Standard and Premium packages include: site plan, floor plan(s), exterior elevations (all 4 sides), building sections, electrical plan, plumbing layout, mechanical/HVAC layout, foundation details, framing plan, and Title 24 / energy compliance documentation.
Fill out the contact form with your project type, approximate square footage, and any sketches or photos you have. A dedicated project coordinator will reach out within 4 business hours to walk you through the intake checklist.
We draft all construction documents in AutoCAD — the industry standard for building department submissions — and use Chief Architect for 3D modeling and space planning. Photorealistic renders included in the Premium package are produced in Corona Renderer.
Every package includes 2 full revision rounds. A revision round covers as many changes as you can consolidate into a single feedback session — so there's no per-comment limit. If your project requires additional rounds, we offer them at a flat rate.
Our 98% first-submission approval rate is our track record. In the rare event of a correction notice from your building department, we review the comments and make the required drawing revisions at no additional charge.
We currently serve California, Texas, Arizona, Florida, Oregon, Washington, and Colorado. If you're in a state not listed, contact us — we evaluate new jurisdictions on a case-by-case basis.
We offer a 14-day money-back guarantee from the date of purchase, no questions asked. If work has begun and you've received a first draft, a pro-rated refund applies based on work completed.
Refer a Friend
Know someone planning an ADU, garage conversion, or home addition? Send them our way and earn 10% of their project value — paid the moment they sign.
Send a friend or neighbor our way — by email, text, or the contact form. Just mention your name so we can track it.
Once they book a project and payment is confirmed, we record the referral against your name.
10% of their project value is sent to you — no cap, no expiry, no minimum. Refer as many homeowners as you like.
Service Areas
Permit-ready drawings built to each city's local codes. Select your city for zoning rules, costs, and timelines.
Get your permit-ready drawings in 10 business days, thousands less than a local firm.
Start Your Project →Resources & Guides
Everything you need to know about permits, design, and costs before you break ground.
A home addition adds permitted square footage to your house. Covers 8 types, costs from $5K–$500K, permit requirements, what drawings you need, and how to plan it.
Read Article →
ADU construction cost ranges from $40,000 for a JADU to $400,000+ for a custom detached unit. Get real numbers by type, size, and state for 2025.
Read Article →
A garage conversion turns unused square footage into permitted living space (studio, bedroom, ADU, home office, or rental apartment) for $15,000 to $75,000. This guide covers every type, real costs, permit requirements, what drawings you need, and exactly how to get started.
Read Article →