If you are a property owner submitting a Wetland Conditional Use Permit, the project will go before both the Conservation Commission and the Planning Board for approval. The Conservation Commission is advisory to the Planning Board and will make a recommendation on the application to them. Applicants or their representative will need to attend these meetings to give a presentation on the project. This is necessary to give Conservation Commission and Planning Board members a clear picture of what is being proposed as well as providing the ability to answer questions. If you have hired an outside party, such as an engineer, wetland scientist, landscape architect, etc., to produce your application, you may request that they present it on your behalf if they are willing. 

The Site Plan Review Technical Advisory Committee, also called the Technical Advisory Committee or TAC, is composed of city staff members from various Departments that provide technical review on applications before they are reviewed by the Planning Board. Site Plan, Subdivision, and Parking Conditional Use Permit applications all require review by TAC. For more information on the Technical Advisory Committee and to view the meeting calendar, please visit the Technical Advisory Committee webpage on the City of Portsmouth website --> https://www.cityofportsmouth.com/planportsmouth/site-plan-review-technical-advisory-committee

Please contact the Planning and Sustainability Department at (603) 610-7216 or planning@cityofportsmouth.com and administrative staff will direct you to a Planner who can discuss your project with you.

Yes, there are multiple buffers from wetlands, but the standard City buffer is 100 ft. This applies to all wetlands in Portsmouth that are over 10,000 s.f. as well as the jurisdictional tidal wetlands and vernal pools in Portsmouth. In addition to the 100 ft buffer, there are specific restrictions for what a property owner can do within 0-25 ft, 25-50 ft, and 50-100 ft of a wetland boundary. Please see Article 10 in the City of Portsmouth Zoning Ordinance for more information. 

In addition to local wetland buffers, be sure to check out the New Hampshire Department of Environmental Services webpage as the state has different wetland buffers for state waters such as tidal rivers, streams, and prime wetlands. 

To see if you have a wetland or wetland buffer on your property, please check out the City’s MapGeo online mapping application and be sure to turn on the ‘Wetlands’ layer under the Theme bar. If you are still unsure, please contact Kate Homet in the Planning & Sustainability Department for more information at (603) 610-7225 or by email at kehomet@cityofportsmouth.com.  

A building permit is needed for any pool addition. Staff will review the application to see if the proposed location impacts any wetland buffers, or is in the historic district, and you will be notified of the next steps if those regulations apply. Swimming pools are treated as accessory structures and need to meet setbacks within their Zoning District. 

A building permit is needed for a shed, or accessory structure except if it meets the following criteria (Section 10.811.60):

Any lot containing one or two dwelling units is permitted to construct and maintain a one-story detached accessory structure used as a tool or storage shed, playhouse, treehouse, or similar use per dwelling unit on the property, with a square footage not greater than 120 square feet. Accessory structures permitted shall not require any permit and shall be generally exempt from all provisions of the Zoning Ordinance except Article 10, Environmental Protection Standards, Section 10.516.30, Corner Lot Vision Obstruction, and Section 10.630 Historic District.

No accessory building, structure or use shall be located in any required front yard, or closer to a street than the principal building (Zoning Ordinance - Section 10.571) and all accessory buildings and structures shall be included in the computation of building coverage (Zoning Ordinance Section 10.574). Staff will review the building permit application to see if the proposed location impacts any wetland buffers, or is in the historic district, and you will be notified of the next steps if those regulations apply. All accessory structures are required to meet the setbacks of the Zoning District where they are located.  

1. An accessory building or structure not more than 10 feet in height and not more than 100 square feet in area shall be set back at least 5 feet from any lot line (Section 10.573.10). 
2. An accessory building or structure more than 10 feet in height or more than 100 square feet in area shall be set back from any lot line at least the height of the building or the applicable yard requirement, whichever is less (Section 10.573.20). 

Each application for a potential ADU is unique. We encourage you to come in and meet informally with the Planning Staff to discuss before making a formal application.  

There are two types of ADU – Attached and Detached – that can be created on a single-family property.  

1. Attached: An Attached ADU is conversion of interior space, an addition to the side or on a single-family residence. Interior renovations will require Administrative Approval. Additions will require Planning Board approval through a Conditional Use Permit.  
2. Detached: A Detached ADU will require Planning Board approval through a Conditional Use Permit. 

Staff will review each application and determine what the permitting process will require. After our informal meeting and if you decide to create an ADU, a building permit application must be made. This can be done using the online permitting program OpenGov. Planning and Sustainability staff will then work with you on the permitting process, making requests for any additional information if required. 

Depending on the height and location of a retaining wall, zoning review and a building permit may be required.  Please contact the Planning & Sustainability Department at 603-610-7216 or the Inspections Department at 603-610-7243 for a preliminary review of your retaining wall. 

We may have a subdivision or site plan on file for your property. It is unlikely that we will have a residential plot plan on file in the Planning Department, but you may want to make an appointment to review our files. Please contact the Planning Department at (603) 610-7216 and we can determine what we may have on file for your property. For review of the Inspections Department files please contact them at (603) 610-7243. 

You can find your Zoning District by searching for your property on MapGeo. Type in your address in the “Property Quick Search” box in the upper right corner of the map. Click on the “Themes” layer and toggle on “Zoning”. The legend will indicate which zone or zones your property is located in.  

The Zoning Ordinance outlines the use requirements for each zoning district in Section 10.440 - Table of Uses and the dimensional requirements in Article 5 and Section 10.521 - Table of Dimensional Requirements.  

If you need more assistance with the specific zoning requirements for your project please inquire with the Planning and Sustainability Department staff at (603) 610-7216.