Residential Additions Permit & Inspection Process
A permit is required if you extend the area, height or overall footprint of an existing one– or two-family dwelling or their existing accessory structures.
If your construction project includes both alteration and addition to the structure you will receive an Add/Alter permit.
If your project includes an accessory dwelling unit (ADU) such as accessory apartment, granny pod, backyard cottage or carriage house, among others, please read the applicable requirements.
Listen to the DPS Podcast about ADUs for more information!
A permit is required prior to construction of a building or structure that increases the area, height or overall footprint of an existing one– or two-family dwelling or their accessory structures.
If a code violation is reported at your property, an inspector will order appropriate corrective action which may include obtaining a permit.
In many circumstances, electrical , mechanical , public right-of-way , well and septic , and/or fire protection permits are required to complete the project. You will also need to make sure that your project conforms to Zoning requirements.
Many of the subdivision and developments in Montgomery County have private deed restrictions and covenants regulating construction. The County does not enforce covenants and deed restrictions. You may obtain information from your homeowner’s or civic association. You may also need a permit or other permission if you live a Montgomery County municipality that requires it.
Applications for eligible projects will be taken in and reviewed through the intermediate track process. Other applications will be taken in and reviewed through the regular review process which may take up to 17 calendar days.
Applications processed through regular review must be reviewed and approved by DPS and WSSC (if applicable). DPS is committed to completing code reviews within 17 days for adequately prepared applications. WSSC is an outside agency that must complete their review before your permit may be issued.
Please refer to our list of guidelines for information that must be included on your plans.
Please refer to our fee schedule for information regarding fees associated with this permit application process.
Homeowners may apply for the building permit in their own name; however, if a contractor is to perform the work, DPS strongly suggests that the contractor be listed on the permit as the party responsible for the work. A contractor must have a Maryland Home Improvement Commission (MHIC) license to obtain a permit.
Please see our list of required inspections associated with this permit application type.