Sorry, you need to enable JavaScript to visit this website.


Department of Buildings

In observance of the Memorial Day holiday, DOB will be closed on Monday, May 27, 2024; no construction will be allowed on this day without an after-hours permit. You may report illegal construction by submitting an Illegal Construction Inspection Request Form during normal business hours or by calling 311.

Menu Button

Welcome to the Department of Buildings

1 I Need To...
2 ...



DOB’s online platform, Certifi, allows for the centralized submission, tracking, and issuance of Certificate of Occupancy (C of O) applications.

Check out Certifi's User Guide for information on the application submission and review processes.

Certifi clarifies and simplifies the C of O application process by allowing users to move through a step-by-step path based on their project’s needs, and increases transparency and efficiency of the review process for applicants and DOB reviewers.

In the District of Columbia, we want to encourage responsible growth and development, but we also want to ensure that construction happens safely. This platform allows us to continue prioritizing safety while also enhancing the customer experience and streamlining our processes, leading to a seamless progression that allows customers to hold us accountable and boosts our processing capacity.


Go To Certifi



Certifi User Guide

Certifi FAQs

Video Snippets: How To Apply for a C of O Using Certifi

Certifi External Introduction and Training Recording - October 19, 2023 

External Stakeholder Training PowerPoint - October 19, 2023