2026 GUIDE • WASHINGTON DC

How much does a stormwater management plan cost in Washington DC in 2026

Most projects in Washington DC pay $500 – $3,000 for stormwater management plan review and associated permits in 2026, with the total driven by the amount of impervious area you’re adding, your site’s drainage conditions, and how much engineering the plan requires.

Stormwater management is the quiet line item that surprises developers after they’ve priced their building permit. DC’s stormwater rules require most new construction and significant redevelopment to manage runoff on site, and the review sits largely with DOEE even though it travels alongside your DOB permit.

Cost breakdown (2026)

Fee component	Typical 2026 cost
Filing fee	$32
Stormwater plan review fee	$200 – $1,200
Base permit fee (tiered by construction value)	$150 – $800
Plan review (site, grading, drainage)	$150 – $500
Technology fee (10%)	~10% of permit fee
Enhancement fee (6%)	~6% of permit fee
Typical total	$500 – $3,000

Large sites with extensive paving or parking push well beyond this range, since both the review and the required treatment volume grow with impervious area. If your project also disturbs ground, pair this with an erosion and sediment control permit.

What affects the price

• Impervious area added. The single biggest driver. More roof and pavement means more runoff to manage and a larger treatment requirement.
• Site conditions. Slopes, soil type, high groundwater, and proximity to streams or combined-sewer areas change how complex — and costly — the plan must be.
• Declared construction value. The DOB permit fee base scales with value, so plan cost and permit fee move together.
• Engineering scope. Sites needing detailed hydraulic modeling, infiltration testing, or green infrastructure design cost more to plan.
• Agency coordination. DOEE review, erosion controls, and DC Water coordination can each add fees and time.

How the fee is calculated

DOB uses a formula, not a flat rate. Under the DOB fee schedule (2026):

1. Filing fee: roughly $32, charged up front.
2. Base permit fee: tiered by declared construction value — roughly $148 for the first $1,000, then about $10 per additional $1,000. Minimum flat tiers for very low-value work run around $33 – $65.
3. 10% technology fee: added on top of the permit fee.
4. 6% enhancement fee: also added on top.
5. Zoning fee: where a zoning review applies.

Stormwater review is charged separately and is driven by site metrics — chiefly impervious area — not by construction value alone. The key takeaway: fees scale with declared construction value, while stormwater cost scales with how much runoff you create.

Budget the plan as a design-phase cost, not a permitting afterthought. Good stormwater design happens while the site layout is still fluid; once grading is set, options narrow and costs rise. Owners who bring an engineer in early usually spend less on infrastructure, face fewer review cycles, and avoid the schedule hit of redesigning a site to fit treatment practices that should have shaped the layout from the start.

Timeline & steps

1. Survey and site analysis. Establish existing and proposed impervious area and drainage patterns.
2. Engineer the plan. Size treatment practices to the required volume and document soil and infiltration assumptions.
3. File via CitizenAccess. Submit the stormwater plan alongside the building or site permit.
4. Review: expect 3 – 8 weeks, with revision cycles adding time for complex sites.
5. Construction and inspections: stormwater practices are inspected as they’re installed and again at closeout.

Common mistakes

• Designing before calculating impervious area. The treatment requirement drives everything; get the numbers first.
• Ignoring combined-sewer constraints. Sites in combined-sewer areas face additional requirements that catch unprepared owners late.
• Skipping infiltration testing. Assumed infiltration that isn’t verified on site often fails review or, worse, fails at inspection.
• Underestimating maintenance obligations. Stormwater facilities carry long-term maintenance duties that affect design choices and cost.

FAQ

Is a stormwater plan always required in DC?

No. Requirements depend on the amount of impervious area and the nature of the project. Small projects that add little or no impervious area may be exempt, while larger redevelopments almost always trigger review.

Does this review happen at DOB or DOEE?

Stormwater management sits largely with DOEE, but it travels alongside your DOB permit, so the two are coordinated during review and closeout.

How much does the plan itself cost to prepare?

Engineering fees vary widely with site complexity. Simple residential plans may cost a few hundred dollars to prepare, while complex commercial sites can run into the thousands — separate from the review fee.

Can I pay a fee instead of managing stormwater on site?

In some cases off-site compliance or payment in lieu may be allowed, but eligibility is narrow and specific to the site. Confirm with DOEE before assuming it’s an option.

When should I start the stormwater plan?

Early — ideally alongside schematic design. Stormwater constraints can change the layout of a site, and discovering them late forces expensive redesigns.

Disclaimer

Figures on this page are 2026 estimates based on the DC Department of Buildings fee schedule. Fee schedules change; always verify current amounts with DOB directly or through the CitizenAccess portal before filing. This article is informational and is not legal or financial advice.