Structured cabling and low-voltage installation in Washington, D.C.
Cablify installs network cabling, fiber, security cameras, access control and Wi-Fi across the District, Northern Virginia and suburban Maryland, for offices, federal contractors, labs and data centers.
- District of Columbia
- Downtown, NoMa, Navy Yard
- Northern Virginia
- Arlington, Alexandria, Tysons, Reston, Ashburn
- Suburban Maryland
- Bethesda, Rockville, Silver Spring
Three jurisdictions, three rulebooks
One metro, but the District, Virginia and Maryland each license and permit low-voltage work their own way.
District of Columbia
- Signaling and communications wiring counts as electrician work, and the District issues a master electrician limited license for low voltage
- DOB’s supplemental electrical permit covers data, CCTV, alarm and fire alarm devices, signed by a master electrician
- Alarm dealers and their agents are licensed, and each dealer must engage a limited master electrician
Virginia
- DPOR’s ESC specialty covers electronic and communication systems at 50 volts or less
- DCJS licenses electronic security businesses and registers their technicians, who complete 14 hours of entry training
- Fire alarm work falls under DPOR’s separate FAS specialty
Maryland
- Maryland State Police license security systems agencies and individual technicians
- Montgomery County issues low-voltage permits for work at 50 volts or less, including network cabling, without an electrical license
- Work above 50 volts needs a Maryland master electrician
A planning summary, not legal advice. Counties and cities add their own permit rules, and we confirm what applies to each address.
Secure and federal spaces
Secure rooms built to ICD 705 follow the Intelligence Community’s technical specifications, and the sponsoring agency’s TEMPEST authority reviews the plans. Those rules shape the cabling from the first drawing.
Tell us the clearance and escort requirements at the start. We confirm what we can staff before we quote.
- Telecom cable enters through a single inspectable opening and is labeled
- Unused copper is removed or grounded, and unused fiber is capped and labeled
- Signal lines are marked RED or BLACK on the plans, with the separation the TEMPEST review sets
- Access control wiring is reachable only from inside the room, and data leaving it is encrypted
- Installers are cleared, or escorted at all times by indoctrinated staff
Data Center Alley
Loudoun County counted about 233 data center buildings and 56.5 million square feet built or under construction as of March 2026. CBRE put Northern Virginia at 4,496.5 MW of inventory, with 2,420.2 MW under construction and 0.2% vacancy, in the first half of 2026, the largest data center market in the U.S.
Growth is meeting limits. Since March 2025, new data centers in Loudoun need a special exception instead of being allowed by right, and power delivery from Dominion Energy is taking longer.
We install fiber trunks, racks and ladder rack in data halls, and the cabling, cameras and access control in the offices and support spaces around them, to each operator’s standards.
Across the region
Government, contractors, life sciences and data centers, each with its own district.
Downtown and K Street
The District’s core office market. About 3.6 million square feet of downtown office space was demolished or repurposed in 2025.
NoMa and Navy Yard
NPR’s headquarters in NoMa and the U.S. Department of Transportation’s 1.35 million square foot headquarters at Navy Yard.
National Landing
Amazon’s HQ2 at Met Park, about 2.1 million square feet with room for more than 14,000 workers, alongside Crystal City offices.
Tysons
About 28 million square feet of office space, home to Capital One, Hilton and Booz Allen Hamilton.
Reston and Herndon
Offices along the Dulles corridor, linked by the Silver Line since its extension to Ashburn opened in 2022.
Bethesda and Rockville
NIH, FDA and hundreds of life sciences companies in Montgomery County along the I-270 corridor.
Common questions
Which rules apply to my site?
It depends on whether the address is in the District, Virginia or Maryland, and on the county. We check the licensing and permit rules for each site when we scope the job.
Can you work in a SCIF?
We plan and install cabling to the room’s ICD 705 requirements and the TEMPEST review. Access rules come from the sponsoring agency, so tell us the clearance and escort requirements up front and we will confirm how we can staff the work.
Do you work in Ashburn data centers?
Yes. We install fiber, racks, ladder rack and patch fields in data halls and colocation suites, and follow each operator’s access, labeling and change rules.
Do you cover the Virginia and Maryland suburbs?
Yes. Our Washington market covers the metro area, including Arlington, Alexandria, Fairfax and Loudoun counties in Virginia and Montgomery and Prince George’s counties in Maryland.
Request a quote in Washington, D.C.
Send the address, building type and what you need installed. Tell us if the space has security or clearance requirements.