DC's oldest working Carnegie library finally reopens, doubled in size and fossil-fuel-free

For residents of Capitol Hill, the wait is finally over. The Southeast Library at 403 7th Street SE reopened this morning after closing on January 4, 2024, two years and nine months in which the neighborhood's closest public library branch was a folding table of book holds at the Arthur Capper Community Center and a longer bus ride to Northeast. The branch that came back today is barely recognizable in floor plan, though the brick facade and front steps look exactly as they have since 1922.

Mayor Muriel Bowser joined District leaders, library staff, and community members Thursday to celebrate the grand reopening of the historic Southeast Library in the Capitol Hill neighborhood. The $41 million modernization doubled the size of the century-old Carnegie Library and preserved one of the District's most significant neighborhood landmarks. The final price tag is $8 million higher than the $33 million figure DC Public Library announced when it closed the branch in late 2023, a gap DCPL has not detailed line-by-line in public documents released to date.

How do you double a building you cannot tear down?

That was the engineering problem Quinn Evans and general contractor Whiting-Turner had to solve. The answer turned out to be underground. To pull off the expansion while preserving the historic building, crews lifted the century-old masonry shell onto steel supports so they could excavate below it, a technique the mayor's office called unprecedented for a DC Public Library project. The library's total footprint grew from 7,943 square feet to 17,547 square feet, with the size of the building below ground doubling as part of the dig.

Richard Reyes-Gavilan, executive director of DC Public Library, described the approach plainly: "By doubling the size of the building below ground, adding generous amounts of natural light throughout, and installing a fully accessible entrance, we have created a space that can welcome tens of thousands of additional visitors per year while keeping the familiar footprint of the 1922 historic library the neighborhood loves."

The numbers behind that expansion are specific. The new library provides 25 percent more meeting and conference space, 50 percent more computer space, almost 50 percent more space for books, double the adult seating, and triple the space for children and families compared to what the branch had before construction started.

The building, constructed in 1922 and one of several libraries built with funds from the Carnegie Foundation, sits just steps from DC's Eastern Market Metro. The brick exterior and front steps are unchanged. Inside, one detail that surprised even the renovation team: the renovation restored original historic features on the upper level, including the library's fireplace mantel and its historic laylight, an ornamental glass ceiling panel discovered behind plaster during a 2020 site investigation, restored offsite, and reinstalled as part of the project.

A first for the library system's green goals

Beyond the space gains, the project carries a specific policy significance for the Bowser administration's building decarbonization push. The modernization fully electrified the library so it can operate without fossil fuels, and the project served as DC Public Library's pilot for LEED v4.1 certification, aligning historic preservation with the city's building decarbonization goals. Quinn Evans put a finer point on the carbon accounting: in addition to the embodied carbon benefits of building reuse, the team specified low-carbon materials for the renovation, yielding a 42 percent reduction in embodied carbon compared to a standard new building of the same size.

Outside, brick pavers, granite-clad retaining walls, and new landscaping welcome visitors, and a green roof covers the addition. The main 7th Street entrance, with its granite steps, stays put. The new universally accessible main entrance is on South Carolina Avenue SE, the same entrance that drew objections from some immediate neighbors during the design process years earlier, and that DCPL ultimately kept in the final plan.

Bowser's last library opening

The event carried an explicit note of finality. Mayor Bowser said: "I'm proud that over the past 12 years, we have renovated, rebuilt, or invested in all 26 of our neighborhood libraries. This is probably my final library opening as your mayor, and it's a good one. This library represents the lengths our teams go to get these projects right. They had to lift a century-old building onto steel supports, dig out a new basement, and get creative about bringing in sunlight."

Bowser is retiring after three consecutive four-year terms as mayor. The November general election follows a June 16, 2026 primary in which Ward 1 Councilmember Janeese Lewis George won the Democratic nomination. Bowser is out of office by January.

Since Bowser first took office 11 years ago, all DC Public Library locations have been funded, rebuilt, or renovated. Southeast is the last to come back.

Two years and nine months without a neighborhood library

After the library closed on January 4, 2024, residents relied on interim book holds and public computer access at the nearby Northeast Library, plus an express site at the Arthur Capper Community Center. For a neighborhood that already has one of the District's higher concentrations of children per household, that was a real loss. The Southeast branch consistently ranked among the system's busiest before it closed.

The project also ran longer than DC Public Library originally told the community it would. Early planning documents dated to 2020 put construction through 2024 and a reopening that year. The actual reopening came in September 2026. DCPL has not issued a public explanation of what drove the 20-to-24 month delay beyond the scope of the excavation work.

The cost figure itself has two versions in circulation. DC Public Library's own project page and the original DCist report from November 2023 both listed $33 million as the budget when the project launched. The mayor's official reopening release today and WTOP's reporting both use $41 million. Neither document accounts publicly for the $8 million difference.

What the building looks like now

The renovated library includes expanded space for children, teens, and adults; more space for books, computers, and seating; preservation and restoration of the building's historic elements; a universally accessible entrance; a restored exterior landscape; environmentally sustainable design; and more meeting, collaboration, and study space.

The Southeast Library modernization reflects the priorities of Next Libris, DCPL's Facilities Master Plan, which guides how the District will maintain, design, and expand library facilities in the years ahead. The plan focuses on maintaining aging buildings and systems, designing interiors around the needs of individual communities, and growing the system to provide fair library services across the city.

The branch reopens to the public beginning today. Programming kicks off immediately: an evening event Thursday and a 7:00 p.m. adult program are already on the calendar for September 10. The library's phone is 202-503-7590 and its email is southeastlibrary@dc.gov.

What D.C. Residents Should Watch

• The $8 million cost gap. The project was publicly budgeted at $33 million when it launched; the city's reopening materials put the final number at $41 million. DC Public Library and the Department of General Services have not released an itemized accounting of the difference. Residents and the DC Council's Committee on Libraries, Parks, Recreation, and Youth Affairs should press for one.
• The timeline question. The project ran roughly two years later than early community-meeting timelines projected. As DC Public Library continues modernizing other branches under Next Libris, the Southeast experience is a data point on whether DCPL's public schedules and budgets are reliable planning documents or optimistic floor-setters.
• LEED v4.1 pilot results. Because Southeast is DC Public Library's first LEED v4.1 project, the system is watching whether the certification process and the fossil-fuel-free operations hold up under real-world use. If it works, the model travels to future renovations across all 26 branches.
• The accessible South Carolina Avenue entrance. Neighbors near that entrance raised concerns during the design phase. Now that the building is open, community reaction to foot traffic and noise on that block will be worth tracking, particularly through the relevant ANC (6B).
• Who inherits the library portfolio. With Bowser leaving office in January, the incoming mayor will own the Next Libris plan and its remaining commitments. Where the Chevy Chase Civic Site rebuild and any other pending library projects stand in the new administration's first budget will be the first test of whether the 12-year renovation run continues or stalls.

Sources

• Mayor's Office, official reopening release, Sept. 10, 2026
• WTOP, Kate Ryan, Sept. 10, 2026
• DC News Now, Sept. 10, 2026
• Hoodline, Sept. 10, 2026
• Hill Rag, Elizabeth O'Gorek, July 8, 2026
• DCist, Nov. 20, 2023 (original renovation announcement)
• Quinn Evans Architects, project page
• DC Public Library, Southeast Library Modernization Project page
• Mayor's Office, public calendar, Sept. 10, 2026