82% of U.S. rental apartments are in buildings more than 10 years old, legacy stock that predates modern managed Wi-Fi design. Delivering a great resident experience in these buildings is an inside-wiring problem first and an access-point problem second. This article examines the brownfield market, the retrofit cost structure, and the wire-reuse technologies that make the economics work.
- Brownfield properties (10+ years old) account for 82% of the addressable U.S. multifamily rental market or about 20 million units, where managed Wi-Fi growth will concentrate through 2031.
- 65.8% of U.S. apartment stock, or roughly 15.4 million units, was built before 2000, predating the structured cabling required by modern managed Wi-Fi.
- Retrofit costs run 40–60% higher than greenfield, driven by inside-wiring labor, pathway construction, and occupied-unit coordination rather than equipment.
- Wire-reuse technologies (G.hn over copper, MoCA 2.5 over coax) deliver 2–2.5 Gbps over legacy in-building media, enabling gigabit-class managed Wi-Fi without opening walls or scheduling unit-by-unit cable pulls.
- Brownfield success requires pairing pragmatic retrofit solutions with a cloud-managed access and experience platform that standardizes deployment and continuously assures the quality residents expect from day one.
The managed Wi-Fi conversation in multifamily housing tends to focus on the resident-facing experience: instant-on connectivity, property-wide roaming, move-in ready, and no service call escalations. Those real benefits explain why managed Wi-Fi (property-wide, professionally operated Wi-Fi delivered as a single network across all units and common areas) is gradually displacing retail ISP arrangements in many new development projects. But the experience layer is only as good as the network beneath it.
If the access points are starved by undersized backhaul, if the wiring between floors cannot carry gigabit speeds, or if the GigE riser infrastructure has not kept pace with modern access points, the resident experience collapses regardless of how new the access points are. Resident experience starts inside the walls. Solving this consistently at scale requires an access-and-operations platform that can standardize design, automate activation, and continuously ensure experience across every building type.
Defining Brownfield
There is no official industry definition of a brownfield property in the managed Wi-Fi context. Operators, vendors, and analysts apply the term inconsistently, with some drawing the line at 5 years post-construction, others at the year 2000, and others including any property with a certificate of occupancy as a brownfield. The year 2010 is also often cited as a pivotal moment when structured cabling (CAT-5 and later) began to be used more frequently in new multifamily construction. But this threshold is still somewhat arbitrary.
For this discussion and the segmentation used in our latest research, a brownfield property is defined as any multifamily building more than 10 years old being considered for a managed Wi-Fi retrofit. That cut isolates the buildings most likely to predate the structured-cabling baseline and most likely to require meaningful inside-wiring intervention to deliver modern performance.
Why Greenfield Stays Single-Digit
Multifamily completions peaked at 608,000 units in 2024, the highest level since 1986, then declined to roughly 585,000 units in 2025 according to Yardi Matrix tracking. Yardi forecasts 441,000 completions in 2026 and 407,000 in 2027, with further moderation through 2031. Even at the 2024 peak, new construction added only about 2.4 percent to the existing rental inventory in a single year. As completions decline through the back half of the decade, that market share contracts further. The mathematical implication is that any operator scaling managed Wi-Fi deployment at a meaningful pace will do the bulk of that work inside existing buildings, not new ones. The full forecast and segmentation methodology are documented in the Maravedis U.S. Multifamily Rental Connectivity Market Analysis, 2026-2031.
The Maravedis market model puts the U.S. market-rate rental inventory at 24.93 million units at year-end 2025, growing to roughly 26.05 million by 2031. Inside that base, units less than 10 years old account for about 4.6 million today, or roughly 18 percent of the stock. The remaining 82 percent of the addressable market sits in properties that were built, wired, and commissioned before modern managed Wi-Fi was even part of the design conversation. That 20-million-unit pool is where the next decade of managed Wi-Fi deployment will concentrate.
The brownfield reality gets sharper when the age cut moves further back. NMHC tabulations of the 2023 American Community Survey[LG5] put roughly 65.8 percent of the U.S. apartment stock, about 15.4 million units, in buildings constructed before the year 2000. Roughly 7.6 millions of those units sit in buildings completed before 1980. These are properties built around analog phone service, copper coax for cable television, and minimal in-unit data infrastructure. Many were retrofitted at some point with Category 3 or Category 5 cable for early DSL or twisted-pair video, but very few were ever rewired for the bandwidth profile (typically at least 1 Gbps shared backhaul per riser segment and a sustained 300–500 Mbps per occupied unit at peak) that managed Wi-Fi now requires. Though again, no formal standard or definition exists today of what these numbers should be.
This is the segment where deployment economics can start to fracture. Garden-style suburban properties with accessible crawl spaces and reusable Cat5e or coax fall on the easier end of the spectrum. Pre-1990 dense urban mid-rise and high-rise buildings, with concrete construction, limited or non-existent conduit pathways, and occupied units that cannot be vacated for invasive pulls, sit on the hardest end. The same MSP can deliver an excellent resident experience in the first scenario and struggle to make the math work in the second. That said, modern wire-reuse technologies (as shown in the graph below) materially improve the economics in this hardest segment, so the challenge is one to be solved rather than a foregone conclusion.
The underservice of pre-2000 properties reflects a structural dynamic rooted in the early broadband era. Cable and DSL operators established bulk service arrangements for many of these buildings around 2000, capturing recurring revenue without reinvesting in in-building wiring upgrades. As bandwidth demands grew, the combination of high retrofit costs in occupied older buildings and the incumbents’ historically limited commitment to fiber-forward infrastructure left much of this stock stranded. New entrants recognized the gap but often faced the same physics and economics. The result is an addressable base where operators willing to solve the inside-wiring challenge—rather than avoid it—face limited direct competition and can build durable positions with property owners who have been underserved for two decades.
The chart above lays out the inside-wiring options operators actually encounter across the multifamily stock. The legacy media that defines pre-2000 brownfield buildings (Cat 5 at 100 Mbps, RG-6 coax at around 1 Gbps as a passive carrier) fall short of the bandwidth profile required by a modern managed Wi-Fi deployment. Current new-build cabling (Cat 6A and XGS-PON at 10 Gbps) was specified with Wi-Fi 6E and Wi-Fi 7 backhaul in mind, which is why greenfield deployments are comparatively straightforward. The most relevant row for the brownfield discussion is the hybrid layer in the middle: G.hn over existing copper or coax at up to 2 Gbps, and MoCA 2.5 over RG-6 at 2.5 Gbps. Those technologies clear the managed Wi-Fi bandwidth bar using wiring already in the walls, the practical mechanism by which a 1985-vintage building can deliver a future-ready 2026 resident experience.
What the Retrofit Actually Costs
Looking at per-unit deployment cost on an all-in basis (Wi-Fi access points, switching, and inside-wiring rework where required) is the clearest way to expose the brownfield premium. The numbers below range significantly and are intended to frame discussion, not to serve as case-specific estimates.
Positron Access Solutions, a global leader in innovative connectivity solutions for the hospitality and multi-dwelling unit (MDU) markets, indicated that its solution typically costs between $400 (coax) and $450 (copper), including installation fees but excluding Wi-Fi. Roughly 40 to 60 percent of that retrofit cost stack is inside-wiring labor. Equipment cost is broadly comparable to greenfield. The premium is concentrated in pathway construction, coordination of access to occupied units, and remediation of legacy infrastructure that new construction never has to confront. That cost shape is precisely why the four-quadrant segmentation in the Maravedis Market Rate Connectivity Report assigns very different penetration trajectories to large new properties versus small older ones, with the latter reaching only single-digit penetration by 2031.
The Wiring Constraint and the Workarounds
Property owners and MSPs generally face three options when deciding to upgrade an older building. The first is full fiber-to-the-unit, which delivers the cleanest long-term performance envelope but carries the highest capital and disruption cost in pre-2000 construction. The second is selective new structured cabling combined with Wi-Fi 6 or Wi-Fi 7 access points, accepting some compromise on top-end performance in exchange for a more practical retrofit footprint. The third is reusing the existing inside wiring, typically coax or telephone-grade copper, with technologies designed to deliver multi-gigabit performance over those legacy media.
That third path has become a meaningful part of the toolkit. Solutions from vendors like Positron Access Solutions allow operators to leverage existing in-building coax and twisted-pair copper to backhaul access points and deliver gigabit-class service to residents without opening walls or scheduling unit-by-unit cable pulls. For pre-2000 buildings where the economics of full-fiber retrofits do not pencil out and bulk deployment timelines cannot tolerate months of disruption, reusing the wiring already in the walls is often the difference between a project happening and not happening at all. Excellence in this segment is recognized through the Maravedis MDU Connectivity Awards, which include a dedicated Best Retrofit category honoring operators and vendors delivering measurable resident-experience outcomes in legacy buildings. In practice, these retrofits work best as part of an ecosystem: in-building wire reuse to make the economics pencil, paired with a cloud-managed access and experience platform to provision, secure, and ensure the Wi-Fi service residents actually love.
Delivering a Great Experience Anyway
None of this changes the experience standard residents expect. Whether the building was completed in 1972 or today, residents want move-in connectivity that works on the first day, roaming that follows them from the gym to the unit to the rooftop deck, and a network that does not require a service call when a streaming session drops. The job for property owners and MSPs is to choose a deployment architecture honest about the building they have, not the building they wish they had. That means a clear-eyed assessment of inside wiring during due diligence, a realistic capital plan that accounts for the brownfield premium, and a technology selection process that treats backhaul, riser, and inside-wiring physics as design inputs rather than afterthoughts.
The Wi-Fi network is the foundation of the resident experience, not a feature attached to it. In market-rate multifamily, that foundation will be poured inside an existing building for the foreseeable future. The operators who plan accordingly will pull ahead. A brownfield building, properly equipped with managed Wi-Fi backed by MDU-wide GigE, can deliver a broadband lifestyle equivalent to new construction. Those who treat brownfields like greenfield will find themselves explaining to property owners why resident reviews never improved. For the full forecast, the four-quadrant segmentation, MSP and equipment vendor profiles, and the per-unit cost methodology underpinning the analysis above, see the Maravedis U.S. Multifamily Rental Connectivity Market Analysis, 2026-2031.
The takeaway is simple: brownfield success is won or lost inside the walls. The operators that scale managed Wi-Fi in existing buildings will be the ones that treat inside wiring as a first-order design constraint, then pair pragmatic retrofit options, such as wire-reuse solutions from partners like Positron Access Solutions, with a cloud-managed access and experience platform that can standardize deployment, automate service turn-up, and continuously assure the quality residents feel day to day. Calix brings its AI and cloud platform to the MDU market through a partner ecosystem, including Positron, that covers every building type and wiring scenario.
Coming Up Next: The Case for Wi-Fi 7 in Multifamily
This article focused on the inside-wiring layer, the half of the stack that determines whether a great managed Wi-Fi experience is even possible. The next installment in this series will turn to the access-point layer: the case for deploying Wi-Fi 7 in multifamily, where it earns its premium over Wi-Fi 6 and 6E, and how the choice interacts with the wiring realities covered here. The practical question whether the inside wiring beneath the access points can carry what a Wi-Fi 7 radio is capable of delivering. The two pieces together, wiring underneath and radios on top, are the operational foundation of a great MDU broadband experience, regardless of whether the building was completed in 1972 or today.