Tertius
Tertius
Expanded. Enhanced. All-in-one shop
for construction inspections in the
District.
Providing access to certified third-party
agencies, DOB Construction Inspectors,
and DOEE environmental inspections.
Looking for an Inspector
Offering Inspection Services
One Platform
Centralized Inspection Management
Certified Inspectors
Flexible & Transparent Scheduling
4+
Disciplines and growing
Third-party, special inspections, DOB in-house, DOEE
7,975
New projects in fiscal year 2025
100%
Qualified and certified inspectors
16,000+
Combined inspections in fiscal year 2025
Our growth story
Since its 2021 launch for third-party inspection, Tertius has expanded to
include
DOB construction inspections
, integrated
DOEE services
and introduced a
full-discipline certification
giving customers more visibility, flexibility, and control than ever before.
Certified Third-Party Agencies
Looking for an inspector?
Permits can be inspected either by third-party or by DOB Inspectors
Third-party construction Inspections
Inspection fees are set by third-party companies and paid through Tertius
Regulatory Code, Special Inspections and DOEE Inspections
Only DOB and DOEE approved agencies
Track inspections, download reports, and pay for inspection services with one login
Log in to TPIA
DOB construction Inspections Scheduling
The cost of the inspection is already included in the permit fees
Free service
Schedule within the next 2 weeks
DOB inspecors are certified and approved
Log in to DOB
How it works
A transparent system that ensures every inspection is submitted and received by the appropriate District authority.
Select the discipline
Third-party Regulatory Code, Special Inspections, DOEE erosion and sediment control inspections.
Create a Tertius project
Create a project with the inspection agency you select by using the address or permits.
Coordinate inspection scheduling
Review reports, and manage the inspections services.
Pay through Tertius
Conveniently pay for the inspection services through Tertius.
Monitor inspection progress
See when permits are completed. This finalizes your project.
Add Inspection Types
Search a permit number or all the permits at the same address and select the inspection types you need to be performed.
Select your Preferred Date
The system will show you the available dates for the next 2 weeks. Select the most suitable one.
Check the Results
Get notified about the expected arrival of the inspector on the day of the inspections and see the results in the same app.
Need more information?
Resources
DOB Permit Wizard
SCOUT (Check Your Permit or Inspection Status)
Permit based inspection customer preparedness guide
Third-party Program Procedure Manual
Special Inspections Procedure Manual
Tertius User Guide For Third-Party Agencies
Tertius User Guide for Customers
FAQ
About Access DC
Accela Status
Our web address has changed!
Starting today Friday, April 3, Tertius is moving to
tertius.dob.dc.gov
If you visit the old address after April 3, you will be automatically redirected to this new one. However, please update any saved bookmarks or links.
Your account, data, and login credentials are not affected by this change.
Questions? Contact
[email protected]