Washington Historic Rowhouse Roof and Solar Planning

Confirm the Historic Review Route

DC’s Historic Preservation Office and Historic Preservation Review Board use published design guidelines for work on historic properties. The guidance includes roofs and sustainability, so review both subjects when combining replacement and solar. Confirm the property’s designation and the applicable review route with HPO before choosing visible materials.

The office describes categories of compatible minor work that may qualify for staff review. That is a route to seek approval, not a guarantee that every roof or panel arrangement qualifies. Provide the actual proposal and allow staff to identify the next step.

Draw the Roof From the Street and Above

Prepare a roof plan showing slopes, parapets, chimneys, vents, skylights and proposed panels. Add street-level photographs from the relevant public viewpoints. Ask the designer to show panel height, mounting and the appearance of conduit or other equipment rather than supplying only a top-down rectangle.

The preservation decision can affect the solar arrangement. Resolve that arrangement before treating an energy estimate as a final design. If the proposed location changes, ask the solar provider to revise its assumptions and explain the effect on access, output expectations and roof penetrations.

Agree on the Roof’s Remaining Work

Have the roofer assess the covering, drainage and vulnerable edges before panels are ordered. Identify whether the work is repair, replacement or structural alteration, and which parts will be concealed by the array. Ask the solar installer what condition and mounting details it requires.

Assign responsibility for weatherproofing at every penetration. The agreement should explain who responds if a leak develops and how the two contractors will investigate it. Preserve access to drains, flashings and equipment instead of filling every available roof area with panels.

Keep Approval and Maintenance Records Together

Historic approval, building or trade permits and utility coordination address different parts of the project. Ask the team to identify the documents required for this design and who obtains each. An HPO clearance does not establish that electrical or structural work is complete.

At handoff, collect the approved layout, roof materials, panel and mounting information, inspection records and removal procedures. Ask what a future roof repair would require and who can safely disconnect or move equipment. These details help the homeowner maintain the building without losing the reasoning behind the approved design.

• Who coordinates the roof and solar drawings?
• Which public views and historic features affect placement?
• Who handles leak investigation and future panel removal?

Sources And Local Resources

Official sources checked October 17, 2026. Confirm current requirements with the authority responsible for your property.

• DC Historic Preservation Design GuidelinesRoof and sustainability guidance used in historic-property review.
• DC Work Qualifying for HPO ReviewStaff-review categories and referral for proposals that are not compatible with the applicable guidelines.