--- title: "Home Addition Permits in Anne Arundel County, MD | TBG" description: "Permits for a home addition in Anne Arundel County: setbacks by zone, required plans, grading, septic review, flood-zone rules, inspections and fees." url: https://thebrettgroup.com/guides/home-addition-permit-anne-arundel/ last_updated: 2026-10-14 --- [TBG](https://thebrettgroup.com/) / [Home Remodeling](https://thebrettgroup.com/remodeling/) / Home addition permit guide Local guide · Anne Arundel County · October 2026 # Permits for a home addition in Anne Arundel County Every addition needs a building permit. What decides whether yours gets built as drawn is zoning: setbacks, height and lot coverage, plus septic, grading and flood rules. Here is how it works. Get matched with a builder who knows this - **Always**: Additions need a building permit - **7 ft**: Side setback for a house in R2 and R5 - **5,000 sq ft**: Disturbance limit for a standard grading plan - **50%**: Flood-zone substantial improvement trigger | Zone | Front | Rear | Side | Height | Max coverage | | --- | --- | --- | --- | --- | --- | | R1 | 35 ft | 30 ft | 15 ft | 45 ft | 50% | | R2 | 25 ft | 20 ft | 7 ft | 35 ft | 60% | | R5 | 20 ft | 15 ft | 7 ft | 50 ft | 65% | Setbacks for the house itself under current county law (§18-4-501, -601, -701). The county is considering a rewrite of the zoning code (Bill 61-26) in October 2026, so confirm the current numbers for your lot. ## 1. The permit An addition, which the county defines as an outward or upward extension, is filed as a Residential Single Family Dwelling permit in the Land Use Navigator. Expect to upload: - The building permit application. - Construction plans drawn to an architectural scale with dimensions and materials. - A site plan drawn to an engineering scale, showing property lines, easements, rights of way and any well, septic system or grinder pump. - A Critical Area worksheet and a standard grading plan application, where they apply. Electrical, plumbing, gas and mechanical work each need their own trade permit, pulled by a licensed tradesperson. ## 2. Setbacks, height and coverage The table above shows the setbacks for a house in the most common residential zones. An open deck attached to the house may project up to 10 feet into the rear setback if it stays at least 3 feet from the lot line. On an older lot that is smaller than today's standards, the county allows a house to expand with 25-foot front and rear setbacks, 7-foot sides and a 35-foot height limit. If the addition can't fit, the alternative is a variance, which adds months. ## 3. Grading and the Critical Area Any ground disturbance needs grading approval. A standard grading plan covers projects that disturb 5,000 square feet or less, with cuts or fills under 10 feet and 100 cubic yards, no slopes of 15% or more, and nothing in the 100-year floodplain or within 100 feet of tidal water, streams or tidal wetlands. Larger or steeper sites need a full grading permit. Near the water, Critical Area lot coverage is a separate limit from zoning coverage; see our [Critical Area guide](https://thebrettgroup.com/guides/building-near-the-water-critical-area/). ## 4. Septic and well On septic, the Health Department checks whether the system can handle added living space, and the lot needs room for two future replacement systems. Required septic upgrades must be done before the Health Department signs off. If a site can't meet conventional requirements, a "limited home addition" may be possible: up to 50% more living space, capped at 1,000 square feet, with no new bedrooms and an advanced pretreatment unit. See our [septic guide](https://thebrettgroup.com/guides/septic-upgrades-bay-restoration-fund/). ## 5. Flood zones If the project costs 50% or more of the building's market value, it is a "substantial improvement" and the whole house must meet flood rules, with the lowest floor at least 1 foot above the 100-year flood elevation. Below that threshold, only the addition itself has to be elevated. See our [flood-zone guide](https://thebrettgroup.com/guides/flood-zone-renovation-anne-arundel/). ## 6. Inspections and fees Inspections are scheduled in the Land Use Navigator and typically run footing, foundation, framing, insulation and final, with trade inspections along the way. The building permit fee is based on the cost of the work: a $150,000 addition works out to $1,492, plus the $43 application fee and trade permits. Try our [permit fee calculator](https://thebrettgroup.com/guides/permit-fee-calculator-anne-arundel/), or read [how the permit process works](https://thebrettgroup.com/guides/how-to-get-building-permit-anne-arundel/). ## Where this comes up most [Severna Park →](https://thebrettgroup.com/remodeling/severna-park/) · [Arnold →](https://thebrettgroup.com/remodeling/arnold/) · [Crofton →](https://thebrettgroup.com/remodeling/crofton/) · [Annapolis →](https://thebrettgroup.com/remodeling/annapolis/) · [Millersville →](https://thebrettgroup.com/remodeling/millersville/) · [Pasadena →](https://thebrettgroup.com/remodeling/pasadena/) ## Projects we match - [Additions](https://thebrettgroup.com/remodeling/additions/anne-arundel/): Bump-outs, second stories and in-law suites. - [New custom homes](https://thebrettgroup.com/remodeling/custom-homes/anne-arundel/): Build on your lot with a registered Maryland home builder. - [Kitchen remodels](https://thebrettgroup.com/remodeling/kitchen/anne-arundel/): Layouts, cabinets, counters and full gut renovations. ## Common questions ### Do I need a permit for a home addition in Anne Arundel County? Yes. Every addition needs a Residential Single Family Dwelling building permit, plus separate trade permits for electrical, plumbing, gas and mechanical work. ### How close to the property line can I build an addition in Anne Arundel County? It depends on the zone. Under current law, the side setback for a house is 15 feet in R1 and 7 feet in R2 and R5, and the rear setback is 30, 20 and 15 feet respectively. ### Can I add a bedroom on a septic system? Only if the Health Department approves the system for the added load, which may require a septic upgrade. A limited home addition without new bedrooms is an option on sites that fail conventional requirements. ### How much does an addition permit cost in Anne Arundel County? The building permit fee is $242 plus 1% of the cost over $25,000, plus a $43 application fee. A $150,000 addition works out to about $1,535 before trade permits. ## Official sources [AA County: Single family dwelling permit](https://www.aacounty.org/inspections-and-permits/permits/residential-permits/single-family-dwelling-permit) · [AA County: Do I need a permit?](https://www.aacounty.org/inspections-and-permits/permits/do-i-need-permit) · [AA County Bill 61-26 (current-law text)](https://www.aacounty.org/sites/default/files/2026-07/bill-61-26.pdf) · [AA County: Standard grading plan](https://www.aacounty.org/inspections-and-permits/code-compliance/standard-grading-plan) · [AA County Health: Property improvements](https://www.aahealth.org/environmental-health/wells-and-septic-systems/well-and-septic-applications-property-improvements) · [AA County: Substantial improvement form (PDF)](https://www.aacounty.org/sites/default/files/2023-03/flood-substantial-improvement-form.pdf) · [AA County: Permit fees](https://www.aacounty.org/inspections-and-permits/fees/permit-fees) This guide is general information, not legal or engineering advice. Rules and maps change; confirm the requirements for your property with the permit office before you design or sign a contract. ## More local guides [Renovating or adding on in a flood zone in Anne Arundel County](https://thebrettgroup.com/guides/flood-zone-renovation-anne-arundel/) · [Building or adding on near the water: the Critical Area explained](https://thebrettgroup.com/guides/building-near-the-water-critical-area/) · [Remodeling ideas for Anne Arundel County's most common house types](https://thebrettgroup.com/guides/remodeling-anne-arundel-house-types/) · [Materials that hold up near the Chesapeake](https://thebrettgroup.com/guides/chesapeake-coastal-building-materials/) · [Septic upgrades and Bay Restoration Fund grants in Anne Arundel County](https://thebrettgroup.com/guides/septic-upgrades-bay-restoration-fund/) · [Deck permits in Anne Arundel County](https://thebrettgroup.com/guides/deck-permits-anne-arundel/) · [In-law suites and accessory dwelling units in Anne Arundel County](https://thebrettgroup.com/guides/in-law-suites-adu-anne-arundel/) · [Energy rebates for Maryland home remodels in 2026](https://thebrettgroup.com/guides/energy-rebates-maryland-remodel/) · [Renovating a home in the Annapolis historic district](https://thebrettgroup.com/guides/annapolis-historic-district-renovation/) · [Do you need a permit to finish a basement in Anne Arundel County?](https://thebrettgroup.com/guides/basement-finishing-permit-anne-arundel/) · [Do you need a permit for a kitchen remodel in Anne Arundel County?](https://thebrettgroup.com/guides/kitchen-remodel-permit-anne-arundel/) · [Do you need a permit for a bathroom remodel in Anne Arundel County?](https://thebrettgroup.com/guides/bathroom-remodel-permit-anne-arundel/) · [Do you need a permit for a fence in Anne Arundel County?](https://thebrettgroup.com/guides/fence-permit-anne-arundel/) · [Do you need a permit for a shed or detached garage in Anne Arundel County?](https://thebrettgroup.com/guides/shed-permit-anne-arundel/) · [Do you need a permit for a pool or hot tub in Anne Arundel County?](https://thebrettgroup.com/guides/pool-permit-anne-arundel/) · [Do you need a permit to replace a roof, siding or windows in Anne Arundel County?](https://thebrettgroup.com/guides/roof-siding-permit-anne-arundel/) · [Demolition permits in Anne Arundel County](https://thebrettgroup.com/guides/demolition-permit-anne-arundel/) · [How to get a building permit in Anne Arundel County](https://thebrettgroup.com/guides/how-to-get-building-permit-anne-arundel/) · [Buying or selling a house with unpermitted work in Anne Arundel County](https://thebrettgroup.com/guides/unpermitted-work-buying-selling-anne-arundel/) · [Building permits in the City of Annapolis](https://thebrettgroup.com/guides/annapolis-city-building-permits/) · [Anne Arundel County permit fee calculator](https://thebrettgroup.com/guides/permit-fee-calculator-anne-arundel/) · [Do you need a building permit in Baltimore County?](https://thebrettgroup.com/guides/baltimore-county-building-permits/) · [Do you need a building permit in Howard County?](https://thebrettgroup.com/guides/howard-county-building-permits/) · [Remodeling permits in Anne Arundel County and Annapolis](https://thebrettgroup.com/guides/permits-anne-arundel-annapolis/) · [How to hire a home improvement contractor in Maryland](https://thebrettgroup.com/guides/hiring-a-contractor-maryland/)