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Most properties have more potential than owners realize

Many properties qualify for DADUs, but homeowners often don't realize their property's potential. Understanding the basics helps you start thinking about possibilities, and HeartLink Homes' free consultation provides a preliminary assessment. Our strategic partners provide the detailed technical evaluation to determine exactly what can be built on your property.

First Gate

Location requirements

Before anything else about the lot itself matters, the property has to sit inside the right boundary.

Must be within an Urban Growth Area (UGA)

  • HB 1337 only applies inside UGAs — the legislation that enables flexible DADU development specifically applies to properties within designated Urban Growth Areas
  • Most suburban areas qualify — property in or near a city in Pierce County or South King County is likely within a qualifying area
  • Rural properties typically don't qualify — properties outside UGA boundaries generally don't fall under HB 1337 provisions
  • HeartLink Homes verifies this during consultation — we'll quickly confirm whether your property is within a qualifying area
The Lot Itself

Property characteristics that work well

Lot size and access shape what's buildable more than almost anything else.

Lot size

  • No minimum lot size required under HB 1337 — the legislation removed traditional minimum lot size requirements
  • Smaller lots: may accommodate 1 DADU
  • Larger lots (1/4 acre+): often accommodate 2 DADUs
  • Each property is unique — individual assessment required to determine what's possible

Access considerations

🛤️

Alley Access (Ideal)

  • Can build on property line
  • Easiest utility connections
  • Maximum privacy for main house
  • May qualify for zero-down financing programs
  • Existing garage can be replaced/expanded
🚗

Driveway/Street Access (Also Works)

  • 5-foot setbacks from rear and side property lines
  • Flexible placement options
  • Utilities routed appropriately
Infrastructure

Utility availability

A DADU needs service connections, and existing capacity is a real constraint worth checking early.

Essential Services

  • Water
  • Sewer (or septic with capacity)
  • Electrical
  • Gas (if used)

What Gets Evaluated

  • Existing capacity
  • Connection points
  • Upgrade requirements (if any)
  • Cost implications
Separate Meters Required For
  • Condominiumized DADUs
  • Rental properties (best practice)
  • Legal protection for all parties
Site Review

Property conditions assessed

What's already on the lot, what the ground is doing, and what the code allows.

🏚️

Existing Structures

  • Detached garage (conversion or replacement opportunity)
  • Shed or outbuilding locations
  • Main house condition
  • Easements or encumbrances
⛰️

Site Characteristics

  • Topography and grading
  • Drainage patterns
  • Tree coverage (protections may apply)
  • Critical areas or wetlands
  • Soil conditions

Zoning compliance

  • Current zoning designation
  • Setback requirements
  • Height restrictions (typically 24 feet)
  • Lot coverage limits
  • HOA restrictions (if applicable)
Common Configurations

Scenarios that often work well

Four property configurations that regularly turn out to have DADU capacity.

Scenario 1: Large Backyard

  • 1/4 acre or more
  • Flat or gently sloping
  • Existing utility access

Potential: 1–2 DADUs, significant rental income or sale profit

Scenario 2: Alley-Access Garage

  • Existing detached garage on property line
  • Alley provides access
  • Older garage ready for replacement

Potential: Zero-down financing programs may be available

Scenario 3: Corner Lot

  • Two street frontages
  • Multiple access options
  • Good visibility for sale

Potential: 1–2 DADUs, flexible design options

Scenario 4: Underutilized Side Yard

  • Wide lot with side yard space
  • Good access from driveway
  • Mature landscaping provides privacy

Potential: 1 DADU, maintains backyard use

Honest Picture

Properties that may have challenges

Some conditions make a DADU harder — though not always impossible.

Creative Solutions Often Exist For Properties With
  • Very steep slopes
  • Severely constrained access
  • Significant critical areas or wetlands
  • Insufficient utility capacity
  • Very small lots in congested areas
  • Properties outside UGA boundaries
What You Get

HeartLink Homes' free consultation provides

Six things, at no cost and without obligation.

1. Preliminary Assessment

Of your property's potential.

2. Market Analysis

For your location.

3. Timeline & Process Overview

General understanding of what to expect.

4. Strategic Partner Connections

Introduction to our partners for detailed technical evaluation.

5. Real Estate Strategy Discussion

Rental vs. sale considerations.

6. Honest Assessment

We'll tell you if a DADU doesn't make sense.

Key Messages
  • More properties qualify than homeowners think
  • Each property is unique — requires individual assessment
  • HeartLink Homes provides preliminary assessment and education
  • Strategic partners provide detailed technical evaluation
  • HeartLink Homes handles real estate transactions when you're ready to sell
Common Questions

Frequently asked questions

Suitability questions homeowners ask most often.

The first requirement is that your property must be within an Urban Growth Area (UGA) — most suburban areas qualify. Beyond that, lot size, access, utilities, zoning, and site conditions all matter. HeartLink Homes provides a preliminary assessment during your free consultation. If you decide to move forward, our strategic partners conduct a comprehensive technical evaluation to definitively determine what's possible.
Alley access is ideal but not required. HB 1337 allows DADUs with driveway or street access using 5-foot setbacks from rear and side property lines. Many successful DADU projects have been completed without alley access. HeartLink Homes can assess your specific access situation during consultation.
Possibly. HB 1337 doesn't specify a minimum lot size — any lot that meets the minimum size for the principal unit can potentially have a DADU. However, practical considerations like setbacks, utilities, and parking affect what's buildable. Small lots may accommodate one smaller DADU. Contact HeartLink Homes for a preliminary assessment of your specific lot.
If you have a detached garage with alley or driveway access, it may be an ideal DADU opportunity. HB 1337 allows replacement of existing garages on the property line (if alley access) or with 5-foot setbacks. The old garage can be torn down and replaced with an expanded DADU. Zero-down financing options may even be available for this scenario. Let's discuss your property during a consultation.
It depends on your property and where the DADU will be sited. Efforts are typically made to preserve mature landscaping when possible, especially protected tree species. DADU placement can often be adjusted to minimize impacts. Strategic partners evaluate tree locations during the design phase and work to enhance rather than strip your property.
This is where HeartLink Homes' expertise really matters. If you build DADUs as condominiums and decide to sell them, we handle the entire real estate transaction — pricing strategy, marketing, listings, showings, negotiations, and closing. We'll position your DADUs to maximize value and attract qualified buyers. Our real estate knowledge helps you get the best possible outcome.
Continue the Series

Where to go next

Ready to Explore Your Property's Potential?

Get your free preliminary assessment

We'll help you understand what's possible on your property and guide you through the next steps — without pressure or obligation.

About This Guide & Sources

This property suitability overview was created by HeartLink Homes at Keller Williams Realty Puyallup to help homeowners understand what determines DADU feasibility. Information has been compiled from:

Important: Suitability criteria are set by your local jurisdiction, not by this page. Urban Growth Area boundaries, minimum lot size, setbacks, height limits, lot coverage, tree and critical area protections, parking, separate metering, and utility capacity requirements all vary by city and county and change over time. The figures cited here — including 5-foot rear and side setbacks and a typical 24-foot height restriction — must be confirmed with your city or county planning department for your specific parcel before you make any decisions. HOA covenants may impose additional restrictions. This page is general education, not legal, engineering, tax, or financial advice; nothing here is a determination that any particular property qualifies. Contact HeartLink Homes to discuss your specific property.