Home Addition Drawings · Tigard, OR
Permit-Ready Home Addition
Drawings for Tigard, OR
Expand your home with a permitted room addition, second story, or family room extension. We deliver complete, code-compliant drawing sets for Tigard's building department — in 10 business days, starting at $1,497.
14-day money-back guarantee · 10 business day turnaround
Local Intelligence
What Tigard Homeowners Need to Know Before Submitting
Size & Zoning Rules
Any new square footage added to your Tigard home counts against the same zoning envelope that governs ADU size, meaning large additions may affect your ability to add a future ADU. Tigard's current ADU size cap is 800 sq ft — within the typical range for most floor plan configurations.
Tigard does not impose an owner-occupancy requirement, so you can rent both the main home and any ADU or conversion as investment units.
If the addition creates a second unit or is later converted to a rental, Tigard's ADU market supports approximately $1,745/month for a 2-bedroom unit.
Permit Process & Fees
Building Division permit fees for this project type typically range from $23,549 to $25,893 depending on project valuation and scope. Plan check runs approximately 7 weeks — though each correction cycle adds 3–6 weeks, which is why code-compliant drawings matter so much.
Addition permit packages submitted to Building Division must include a site plan, floor plans, all four elevations, an electrical plan, and energy compliance documentation — plus stamped structural drawings are always required for any load-bearing elements, second-story work, or new foundation.
Visit Building Division ↗Construction Cost Context
Tigard's home addition construction costs run $210–$350 per square foot — a wide range driven by labor markets, local code complexity, and finish level. Our drawings are priced at a fraction of what a full-service architect would charge to produce the same permit set.
⚠ Common Pitfall in Tigard
Tigard's Clean Water Services (the county's sanitary sewer authority) often requires a separate service provider letter before the city will even accept your ADU permit application, and getting that letter can take two to three weeks on its own if your lot's sewer lateral hasn't been mapped recently. Because much of Tigard sits in Seismic Design Category D, engineers frequently size footings and shear walls more conservatively than homeowners expect from online ADU cost calculators, which can push structural engineering fees higher than the flat per-square-foot estimates suggest. Also, since short-term rentals aren't allowed here, several lenders in Washington County will not count projected Airbnb income when qualifying homeowners for ADU construction loans, which catches people off guard mid-financing.
Expert Verdict — Marcus Reid, Licensed Designer
"In my experience working with Tigard homeowners, that 7-week plan check window assumes a clean, correction-free first submittal—which is the exception, not the rule—so I'd budget closer to 10-12 weeks and call the Building Division directly to check current queue times. As for the $300/sqft figure, that reads like a state-level estimate to me; I've seen actual Tigard builds swing well outside that number depending on finishes and site conditions, so get two or three local contractor quotes before you pencil out your budget. — Charlotte Pemberton, Senior ADU Design Consultant"
Market Context
Tigard has a median home value of $479,000. Comparable renovation projects in this market typically add 25.0% to resale value.
Neighborhoods in Tigard with the strongest home addition and resale value potential include West Tigard, East Bull Mountain, Derry Dell, Tigard Triangle, Downtown Tigard. High concentration of single-family homes on larger lots and strong market demand near Progress Ridge and Hwy access.
Permit Process
Permit applications are reviewed by the Building Division, with a plan check timeline of approximately 7 weeks. Permit fees in Tigard range from $23,549 to $25,893 depending on project scope. Design review: Yes - in historic districts only.
Tigard falls within Seismic Design Category Seismic Design Category D (per Oregon Structural Specialty Code / ASCE 7); site-specific SDC must be calculated using ASCE 7/OSSC maps and site soil parameters., which affects structural requirements for any new addition tying into the existing structure.
Local Financing Resources
Local Home Addition Lenders in Tigard
These lenders offer HELOC, construction, and renovation loans for home addition projects in Washington County. Compare terms before committing.
Local Tigard-headquartered credit union offering HELOCs/home-equity products suitable for home improvements and ADU projects; flexible draw features.
Visit Lender ↗Large Oregon-based credit union (branches in the Tigard/Portland area) offering HELOCs for home repair and improvement projects.
Visit Lender ↗Regional credit union offering HELOCs with a $5,000 minimum and typical draw/repayment structure (10-year draw / 20-year repay), suitable for larger ADU/renovation financing.
Visit Lender ↗Specialty ADU/renovation lender that partners with credit unions in Oregon to arrange ADU construction/renovation financing; used by credit unions to fund ADUs.
Visit Lender ↗Regional bank active in Oregon offering HELOCs for renovations and major home projects; draws as-needed and interest-only during draw period.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted Home Addition Contractors in Tigard
We draw the plans. These contractors build the addition. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Drawing Package Details
What's Included in Your Tigard Home Addition Package
Transparent Pricing
Tigard Home Addition Drawing Packages
One-time fee. No retainer. No hourly billing.
- ✓Site plan
- ✓Floor plans (existing + proposed)
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 energy compliance
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Stamped structural drawings
- ✓Foundation plan
- ✓Roof framing plan
- ✓Window & door schedules
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Cross-section details
- ✓Material specifications
- ✓HOA submission package
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
After You Order
Your Addition Drawings in 3 Steps
Submit Your Project Details
Share your property address, existing floor plan (if available), and the addition scope. We assign your project coordinator within 4 business hours.
We Draft Your Drawings
Our team designs your complete addition drawing set — engineered for Tigard's building department requirements and OR CBC code. Delivered in 10 business days.
Submit to Your Building Dept
Download your complete package and submit to Building Division. We support plan check corrections at no extra charge.
Common Questions
Tigard Home Addition FAQs
Do I need a permit for a home addition in Tigard? +
Yes — any structural addition to your home in Tigard requires a building permit. This applies to room additions, second-story additions, sunrooms, and attached garages. You'll need permit-ready drawings before the building department will accept your application. Our packages are formatted specifically for Tigard's submittal requirements.
How much does a home addition cost in Tigard? +
Home additions in Tigard typically cost between $250.0–$320.0 per square foot depending on the scope, finishes, and structural complexity. A 600 sq ft addition ranges from $150,000 to $192,000. Second-story additions cost more than ground-floor extensions due to structural requirements. Our drawing packages start at $1,497 — a fraction of local architectural fees.
What drawings are required to permit a home addition in Tigard? +
Tigard's building department requires: a site plan showing the addition's footprint and setbacks, floor plans for all affected levels, all four exterior elevations, an electrical plan, and energy compliance (Title 24 in California). Structural plans stamped by a licensed engineer are required for any load-bearing elements — included in our Premium package.
How long does the permit process take for a home addition in Tigard? +
Plan check in Tigard typically takes 7 weeks for home additions. Additions with structural components may require additional review. Complete, code-compliant drawings significantly reduce correction cycles — each cycle adds 3–6 weeks. Our drawings are engineered to pass on the first submittal.
What setbacks apply to home additions in Tigard? +
Tigard enforces minimum setbacks from property lines for all additions: typically 4–5 ft side setbacks and 5 ft rear setbacks, though these vary by zoning district and lot size. Your addition must stay within the buildable envelope. Our site plan documents existing and proposed setbacks and flags any zoning variances required.
Do I need structural drawings for a home addition in Tigard? +
Yes, for most additions. Any load-bearing walls, new foundations, second-story construction, or roof structure changes require stamped structural drawings from a licensed engineer. California's CBC (California Building Code) and seismic requirements make structural plans mandatory for most addition types. Our Standard and Premium packages include stamped structural drawings.
How much do home addition drawings cost in Tigard? +
Our permit-ready home addition drawing packages for Tigard start at $1,497. Local architects and designers typically charge $3,000–$10,000+ for comparable drawing sets. Every package is engineered for OR code compliance and formatted for Tigard's building department. Turnaround is 10 business days with a 14-day money-back guarantee.
Will a home addition increase my home's value in Tigard? +
In Tigard, where median home values are approximately $479,000, a permitted home addition adds square footage that appraisers value as part of the home's gross living area. Return on investment varies by addition type — master suite additions, family room expansions, and additional bedrooms typically recoup 50–75% of project cost in appraised value in OR markets.
Can I add a second story to my home in Tigard? +
Second-story additions are permitted in most Tigard residential zones, subject to height limits and design review requirements. California generally requires ministerial permit approval, but some cities impose design compatibility or neighborhood compatibility review for second stories. Our drawings cover all levels including foundation upgrades, shear walls, and roof framing required for vertical additions.
Nearby Cities
Also Available in Tigard
Adding an ADU instead? See our ADU design service.
Next Steps
Ready to Move Forward With Your Tigard ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Building Division.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
$997 – $2,997
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Building Division. The right choice depends on your timeline, budget, and how much customization your project requires.