Key takeaways
- Construction permitting in the District runs through the Department of Buildings (DOB), which absorbed that function from DCRA.
- The District still enforces the 2017 DC Construction Codes: the 2015 ICC model code family plus the 2014 National Electrical Code, as amended by DCMR Title 12.
- Historic districts blanket much of the District’s rowhouse stock, and a permit touching a historic exterior is cleared by the Historic Preservation Office.
- Interconnection runs under the District’s Small Generator Interconnection Rules at 15 DCMR Chapter 40, where Level 1 is inverter-based and capped at 20 kW.
- SREC certification with the Public Service Commission requires as-built construction drawings, so the package outlives final inspection.
Washington, DC solar permitting is different because three separate reviews can land on a single rooftop: the Department of Buildings applies the 2017 DC Construction Codes and the 2014 NEC, the Historic Preservation Office clears exterior work on historic properties, and Pepco interconnects under the District’s own small generator rules. Good DC solar plan sets satisfy all three on the first submittal.
Who actually issues solar permits in Washington, DC?
The District is a single jurisdiction with a single building department. Construction permitting sits with the DC Department of Buildings, which took the function over from the Department of Consumer and Regulatory Affairs. If your cover sheet template still says DCRA, fix that first.
DOB runs two paths for rooftop PV. Eligible one- and two-family residential properties use the Building Instant Permits category in the Citizen Access Portal, which issues on completion and payment; under DOB’s Instant Permits program that path covers roof-mounted systems up to 15 kW. Anything that does not qualify, including historically designated properties, goes through the DOB Permit Wizard and standard electronic plan review. Multi-family and commercial projects are reviewed against the DC Building Code rather than the Residential Code.
DOB states that it completes solar plan reviews within 10 business days. That is the agency’s target, not a promise about your project, and not something a drafting vendor controls. What you control is whether the package is complete when it lands. The gap between first-pass approval and a three-week correction loop is almost always documentation, not engineering, which is the pattern behind most permit rejections.
One more DOB wrinkle: instant-permit work has to be inspected by a third-party inspection agency authorized by DOB, results submitted through the Tertius platform, and final inspection closed within one year of permit issuance. Build that into scheduling rather than discovering it at commissioning. If the District is new to you, our rundown of permitting nuances you may not expect covers the surprises that cost the most schedule.
Which code cycle do DC solar plan sets have to be drawn to?
This is where installers coming from Maryland or Virginia get burned. The District is not on the newest cycle. According to DOB, the 2017 DC Construction Codes consist of the 2015 International Code Council family of model codes, the 2014 National Electrical Code, and 2013 ASHRAE 90.1, as amended by DCMR Title 12. That code took effect May 29, 2020 and is still what reviewers apply.
So electrical sheets get drawn to the 2014 NEC, adopted as the DC Electrical Code at 12C DCMR. Not 2017. Not 2020. Not 2023. If your CAD template carries a 2020 or 2023 NEC reference block because that is what your home state adopted, every DC sheet cites an edition the reviewer is not enforcing. That alone draws comments.
The consequences are real, not cosmetic. Rapid shutdown language, conductor ampacity tables, PV output circuit labeling and equipment-grounding provisions have all moved across cycles. A design leaning on a 2017 or later allowance that did not exist in the 2014 edition is not a compliant DC design, however sound it is elsewhere. Our breakdown of the NEC solar and storage rules covers where the editions diverge.
Zoning is a parallel citation: DOB requires compliance with the 11 DCMR Zoning Regulations of 2016, with a Solar Self-Certification Form available for expedited zoning review of eligible residential buildings. DOB has signaled it is modernizing the codes toward newer ICC editions through rulemaking across 2026 and 2027, but until those rules are final the 2017 codes and the 2014 NEC are what your drawings answer to.
How does historic preservation review change a DC rooftop?
This is the constraint with no equivalent in most markets, and the single biggest reason a DC job goes sideways. Large portions of the District sit inside designated historic districts, including much of Capitol Hill, Georgetown, Mount Pleasant, Takoma, LeDroit Park and Anacostia. Row after row of exactly the housing stock that suits residential PV.
Per the DC Office of Planning, review is required when a building permit is required for work affecting the exterior appearance of a historic property. There is no separate preservation permit to chase: Office of Planning states plainly that Historic Preservation Office clearance of the building permit application is your preservation approval. The review is folded into the permit, so a preservation comment is a permit comment.
Two things follow. First, the property loses the instant-permit path; DOB is explicit that historically designated properties apply through the Permit Wizard, so a job priced as a same-day permit is now a reviewed submittal. Second, the drawings must answer a question ordinary plan sets never address: what does this array look like from the street?
The Historic Preservation Office’s Sustainability Guide for Older and Historic Buildings sets the expectations. On flat roofs, panels are set back from the front edge, and from the exposed side edge on corner properties, to limit visibility from public street view. On sloped roofs, secondary elevations are preferred; where a front-facing array is unavoidable the guidance calls for low-profile panels set flush with the roof in a color complementing the roof finish. Installations should not produce a perceptible change in massing, height or roofline as seen from the street.
So the roof plan needs accurate setbacks from every visible edge, plus street-view context and ridge orientation captured before drafting begins. A sloppy field packet on a Capitol Hill rowhouse is not a drafting problem, it is a redesign. Our solar site survey checklist exists for this submittal. DOB also requires neighbor notification forms for row houses and townhouses.
What does Pepco interconnection require in the District?
Pepco is the electric distribution company for the District, but the process it administers is set by the Public Service Commission. The governing document is the DC Small Generator Interconnection Rules at 15 DCMR Chapter 40, which apply to facilities up to 20 MW that operate in parallel with the distribution system and are not subject to PJM requirements.
There are four review levels, and knowing which one you land in before you draw is the difference between a clean file and a resubmittal:
- Level 1 (Section 4004): inverter-based facilities only, at or below 20 kW. Approval is due within five business days of a complete application, with no application fee.
- Level 2 (Section 4005): thresholds vary by line voltage and location, running into the megawatt range. Screening results come back within 15 business days; power flow studies may be required.
- Level 3 (Section 4006): Level 2 procedures plus reverse power or import relays to prevent export. Not permitted on spot or area networks, which matters downtown.
- Level 4 (Section 4007): full engineering review with scoping meeting, feasibility, impact and facilities studies.
Equipment listing is not negotiable. Section 4002.1 requires interconnection equipment certified to IEEE 1547 and IEEE 1547.1, with inverters listed to UL 1741 by a testing laboratory recognized by OSHA. Section 4002.5 requires the most current approved version of each document at the time of submission. Your cut sheets have to show those listings, not imply them.
The rules also set completion windows: Level 1 certificates of completion are due six months after approval, Levels 2 through 4 get 24 months. On a network-served downtown building, the Level 3 export-limiting and area-network restrictions shape the single-line before you place a module, which is why our commercial solar PV designs start from the interconnection path.
What does a DC submittal package actually need?
Below is the verified spine of a District submittal. It does not replace DOB’s current requirements for the project in front of you, but these facts should already be baked into your title block and general notes.
| Submittal element | What the District requires |
|---|---|
| Permitting authority | DC Department of Buildings (DOB), via the Citizen Access Portal or the DOB Permit Wizard |
| Adopted construction code | 2017 DC Construction Codes: 2015 ICC model code family, as amended by DCMR Title 12 |
| Adopted electrical code | DC Electrical Code (12C DCMR), based on the 2014 National Electrical Code (NFPA 70) |
| Zoning citation | 11 DCMR Zoning Regulations of 2016; Solar Self-Certification Form available for eligible residential |
| Residential fast path | Solar Instant Permit for eligible one- and two-family properties, roof-mounted systems up to 15 kW |
| Historic review trigger | Any permit for exterior work on a historic landmark or property in a historic district; HPO clearance of the permit application is the preservation approval |
| DOB plan review target | DOB states it completes solar plan reviews within 10 business days |
| Interconnection | DC Small Generator Interconnection Rules, 15 DCMR Chapter 40; Level 1 is inverter-based and capped at 20 kW |
| Equipment listing | IEEE 1547 and IEEE 1547.1 conformance; inverters listed to UL 1741 by an OSHA-recognized NRTL |
| Inspection | DOB-approved third-party inspection agency; Residential Solar Inspection Checklist uploaded to Tertius |
| Post-installation drawings | As-built construction drawings must accompany each RPS application for solar energy systems |
The top rows belong on the cover sheet and in the general notes; the bottom rows belong in your close-out checklist. For the sheet-by-sheet version, what a plan set includes breaks down the drawings, calculations, cut sheets and placards a reviewer expects.
When does a DC project need an engineering stamp?
Stamp requirements are driven by scope and by the reviewer, not by a rule you can memorize. In the District the two triggers we see most are structural and commercial. Structural, because the rowhouse and flat-roof stock is old, frequently modified, and rarely comes with usable framing documentation, so a reviewer wants calculations backed by a licensed engineer rather than a generic load table.
Assume a structural review conversation on any historic or unconventional roof in the District, and price it in. Our guide to when a PE stamp applies lays out the decision points, and we provide engineering stamps in-house so a stamp requirement does not send you shopping for an engineer mid-permit.
What a stamp does not do is change the review outcome. A seal establishes that a licensed professional stands behind the calculations. Approval is DOB’s call, and no drafting firm, ours included, can promise it. What we promise is a package that is complete, drawn to the cycle the District enforces, and built to clear first-time review.
How do DC incentives change your project scope?
You are not selling incentives, but they change what you deliver. Two District programs matter to an installer’s paperwork.
First, the SREC market. To create District-eligible Solar Renewable Energy Credits, a generator has to be certified by the Public Service Commission. The Commission’s Renewable Portfolio Standard page carries a requirement that lands squarely on drafting: as-built construction drawings must accompany each RPS application for solar energy systems. Your drawing package is not finished at permit issuance. If the installed system deviates from the permitted design, someone redlines and reissues before the customer can register. D.C. Law 25-217, effective January 1, 2025, also decertified certain solar systems not located within the District.
Second, Solar for All, run by the Department of Energy and Environment, which aims to bring solar to 100,000 low-to-moderate income families in the District, with participants expected to see 50 percent savings on their electricity bill over 15 years. For an installer that is a program channel with its own documentation expectations, not a rebate to advertise. If your sales team wants a plain-language reference on the District incentive picture, use it as ammunition in the conversation and bring the technical scope back to us.
Both bite the design through production modeling and as-built accuracy. Credit revenue is metered against real output, so a string layout that ignores chimney shading is a revenue problem, not only an engineering one. Independent production reports give you a defensible number before the array is committed.
What does working with Avila Solar Drafting on a DC project look like?
We are a drafting and engineering partner for solar installers. Not a marketplace, not a lead source, and we do not compete for installs. You send site data, we return a submittal-ready package drawn to the 2017 DC Construction Codes and the 2014 NEC, with the historic and interconnection constraints already accounted for.
Standard turnaround on outsourced solar plan sets is 2-3 business days from a complete intake. Fast Roof turnaround is 1-2 business days. PV plan set pricing depends on system size, roof complexity and whether stamps are included — current pricing is on the solar plan sets page. Those are drafting timelines, separate from DOB’s review clock, which is the District’s to manage.
Avila Solar Drafting does not accept projects in APS or SRP territory in Arizona, the cities of Peoria and Phoenix, Los Angeles County (LABD) in California. Homeowner-direct projects go through the same order form and carry a separate development and consultancy fee (every business is exempt — the fee applies only to homeowners running their own project) — see current terms at signup.
FAQ
Who issues solar permits in Washington, DC?
The DC Department of Buildings (DOB) issues construction permits in the District, having taken that function over from DCRA. Eligible one- and two-family residential projects can use the Building Instant Permits category in the Citizen Access Portal. Historically designated properties, multi-family and commercial projects go through the DOB Permit Wizard or standard electronic plan review. DOB states it completes solar plan reviews within 10 business days.
Which code edition do DC solar plan sets have to meet?
The 2017 DC Construction Codes are in force, effective May 29, 2020. DOB describes them as the 2015 International Code Council family of model codes, the 2014 National Electrical Code, and 2013 ASHRAE 90.1, as amended by DCMR Title 12. Electrical sheets should cite the 2014 NEC, adopted as the DC Electrical Code at 12C DCMR, not a later cycle. Solar work must also comply with the 11 DCMR Zoning Regulations of 2016.
Does a DC rooftop solar project need historic preservation review?
It does if the property is a historic landmark or sits in a historic district and the work affects exterior appearance. The DC Office of Planning states that Historic Preservation Office clearance of the building permit application is the preservation approval, so there is no separate preservation permit to file. Historically designated properties are not eligible for the instant permit path and apply through the DOB Permit Wizard instead.
What size system qualifies for a DC Solar Instant Permit?
Under DOB’s Instant Permits program, the residential solar scope covers roof-mounted systems up to 15 kW on eligible one- and two-family structures. Properties in historically designated areas are excluded from that path. Instant-permit work must be inspected by a third-party inspection agency authorized by DOB, with the Residential Solar Inspection Checklist uploaded to Tertius, and final inspection completed within one year of permit issuance.
How fast can Avila turn around a DC solar plan set?
Standard turnaround is 2-3 business days from a complete intake, and Fast Roof turnaround is 1-2 business days. PV plan set pricing depends on system size, roof complexity and whether stamps are included — current pricing is on the solar plan sets page. Those figures describe our drafting timeline only. Permit review time belongs to DOB, and no drafting firm can promise a permit outcome. We deliver a complete, code-compliant package designed to clear first-time review.
Order DC solar plan sets
In the District, the code cycle, the historic overlay and the interconnection level are settled before anyone opens CAD. Send the site data and we handle the rest, drawn to what DOB actually enforces.
Order online, or call to talk through a specific rowhouse or a network-served commercial roof first.
Call 971-410-0655
