Are you a resident planning to add an addition to your home? Before you begin, you will need to acquire permits and submit plans. You will also need to complete multiple inspections during your build process.
Listed below are the types of permits required to add an addition to a residential home:
- Residential Building Permit for construction of architectural and structural elements
- Electrical Permit for all electrical installations
- Plumbing Permit for all installations of plumbing and gas piping systems
- Mechanical Permit for the installations, alterations or extensions of new ductwork; or the addition or extension of a mechanical heating or cooling system
- Land Disturbance Application is required for any activities that disturb more than 2,500 square feet of land
(Calculation Example: If your new building footprint is 500 square feet, the land disturbance area will be approximately 1,000 square feet.)
Adding an addition can either be an express review or a route-through review depending on the complexity of the project.
For details about the process, see:
- Residential Permit Review Process
- Land Disturbing Activity Permit Process
(As a rule of thumb, any total new building footprint area of 1,000 square feet or greater will usually indicate a land disturbance of greater than 2,500 square feet. Calculate the land disturbance area for your project by adding up the following areas for your site and following our instructions.)
Construction Document Requirement
Submitted Construction documents must contain sufficient information for plan reviewers to be able to review the proposed construction work.
In addition to the Residential Permit Submission Requirements, submit the following information:
- A scaled plat
- List of design load criteria: live load, dead load, snow load, wind load, bearing capacity and lateral earth pressure
- Footing details (minimum footing depth is 24 inches)
- Location of smoke alarms
- Structural framing plans for each level accurately detailing all members, sizes, span lengths and spacing
- Structural details of connections
- Evaluation report from an authorized listing agency, such as the International Code Council – Evaluation Service, must be submitted for all materials not listed in the code.
- Plans must include load calculations for all columns.
- Typical wall section with sheathing thickness and type
- Wall bracing including location of all braced wall lines and braced wall panels, method(s), and any other special requirements. Proprietary products require an evaluation report from an authorized listing agency.
- Structural framing plan for roof
- Elevations (front, side and rear) indicating window and door dimensions, and windowsill height above finished floor. Exterior grade (both preconstruction and post construction) must be accurately shown.
- Location of safety glazing
- Manufacturer’s design specifications for pre-fabricated fireplaces
- A clear distinction between existing construction, alterations to existing, and new work. Separate “existing” and “proposed” within the plans will make the distinction easier to review.
Throughout the building permit process and depending upon the extent of the work, you will be required to complete different inspections.
Call Arlington to schedule your inspection appointment 24 hours in advance:
- Integrated Voice Response (IVR): 703-222-3700, 24 hours
- Permit Specialists: 703-228-3800, 8 a.m. – 5 p.m., Monday – Friday
The cost for permits varies depending upon each project.
- Any permit expires 6 months after the last approved inspected activity on the site.
- If someone other than the permit holder is tasked with getting the permit from the department, they must have an Affidavit of Permit Authorization.