Before You Build in Hillsboro, OR: Permit & Rule Checklist (2026)
Everything you need to know before starting a home improvement project
Building a fence, installing a pool, or adding a shed? Each project has its own set of local permits and rules in Hillsboro. This guide consolidates fence, pool, ADU, shed, fire pit, and landscaping regulations into one checklist so you know what to expect before you start.
Quick Permit Checklist
At-a-glance overview of permit categories in Hillsboro. Click any card for details.
Fences & Walls
3 rules on file
Swimming Pools
3 rules on file
ADUs & Granny Flats
2 rules on file
Sheds & Outbuildings
2 rules on file
Fire Pits & Outdoor Structures
2 rules on file
Landscaping & Tree Removal
3 rules on file
Fences & Walls
Some RestrictionsHeight limits, materials, permits, and shared fence rules.
Neighbor Fence Rules
Few RestrictionsOregon law does not require neighbor consent for fences on your own property. Shared fence maintenance may be split. Hillsboro enforces code compliance for height and condition only.
Height Limits
Some RestrictionsHillsboro's development code regulates fence heights. Front yard fences are typically limited to 3.5 feet and side/rear fences to 6 feet in residential zones.
Permit Requirements
Few RestrictionsMost standard residential fences in Hillsboro do not require building permits. Fences exceeding height limits, retaining walls, and masonry structures may require permits.
Swimming Pools
Heavy RestrictionsPool permits, safety fencing, and drainage requirements.
Safety Rules
Heavy RestrictionsPools in Hillsboro require permits and inspections per Oregon building code. Anti-entrapment drains, electrical bonding, and emergency shutoffs are required.
Fencing Requirements
Heavy RestrictionsHillsboro requires pool barriers at least 48 inches high with self-closing, self-latching gates per Oregon Residential Specialty Code.
Above-Ground Pools
Some RestrictionsAbove-ground pools in Hillsboro must meet barrier requirements. Walls under 48 inches need separate fencing. Ladders must be removable or lockable.
ADUs & Granny Flats
Some RestrictionsAccessory dwelling unit rules and garage conversion permits.
ADU Rules
Some RestrictionsHillsboro allows ADUs on all single-family lots per Oregon HB 2001. ADUs are capped at 800 square feet. Both attached and detached types are permitted.
Garage Conversions
Some RestrictionsGarage conversions in Hillsboro require building permits. If creating an independent unit, it may qualify as an ADU under Oregon law.
Sheds & Outbuildings
Some RestrictionsShed permits, setback limits, and outbuilding size rules.
Carport Rules
Some RestrictionsHillsboro treats a carport as an accessory structure under Community Development Code Section 12.40.104. In residential zones, side and rear setbacks may be reduced to three feet for an accessory structure meeting Subsection 12.40.104.B. Setbacks are measured to the support posts closest to the driveway, or to the roof edge.
Shed Rules
Few RestrictionsSmall sheds under 200 square feet generally do not need permits in Hillsboro. Larger structures require permits and must meet setbacks.
Fire Pits & Outdoor Structures
Heavy RestrictionsFire pit placement, outdoor burning restrictions, and permits.
Outdoor Burning
Heavy RestrictionsOpen burning is largely prohibited in Hillsboro. Backyard debris burning is not allowed. The Oregon DEQ and Tualatin Valley Fire & Rescue regulate burning restrictions.
Fire Pit Rules
Some RestrictionsHillsboro allows recreational fires in approved fire pits with safety restrictions. Fires must maintain clearance from structures and be attended at all times.
Landscaping & Tree Removal
Some RestrictionsTree removal permits, heritage tree protections, and water rules.
Water Restrictions
Some RestrictionsHillsboro follows regional water conservation guidelines. Mandatory restrictions may apply during summer drought. Efficient irrigation is encouraged.
Tree Trimming
Some RestrictionsHillsboro requires property owners to maintain trees for clearance over sidewalks (8 feet) and streets (14 feet).
Tree Removal & Heritage Trees
Some RestrictionsHillsboro regulates tree removal through its development code. Significant trees and street trees may require approval before removal.
General Permit Tips
When do you typically need a permit?
Most cities require permits for structural work, including fences over a certain height, pools, ADUs, and sheds above a size threshold. Even projects that seem minor can trigger permit requirements, so it is always best to check first.
How to apply for a building permit
Visit your local building department or their website. Most jurisdictions accept online applications. You will typically need a site plan, project description, and may need contractor information. Processing times vary from same-day for simple projects to several weeks for larger builds.
Common permit violations to avoid
Building without a permit, exceeding approved dimensions, and ignoring setback requirements are the most common violations. Penalties can include fines, required removal of the structure, and complications when selling your home.
Permit Guides for Nearby Cities
Looking for rules beyond permits? View all ordinances we track for Hillsboro.