How Much Should You Budget Per Square Foot for an In-Building Radio Coverage (BDA/DAS) System?

Published benchmarks for in-building radio coverage systems sit at roughly US$0.50 to US$2.00 per square foot for most buildings, rising to US$2.50 to US$5.00 or more for complex, high-rise or underground sites. Those figures come from US emergency-responder coverage projects, not Singapore, and square footage is a weak predictor of price for two-way radio. Antenna count, riser length, floor count, construction and the acceptance standard drive the cost far more than floor area, so a per-square-foot number is only good for a first budget line before a survey.

Why is cost per square foot such an unreliable number for a radio DAS?

Because the system is priced by antenna points, cable and head-end equipment, and none of those scale cleanly with area. A 200,000 sq ft open-plan warehouse may need a handful of antennas. A 60,000 sq ft hotel with concrete partitions, corridors and a basement may need several times that many. In UHF (400 to 470 MHz) one antenna in open space can cover a large floor plate, but each reinforced-concrete slab or core wall costs typically 10 to 20 dB of signal, so the count is set by how many obstructions the signal must cross, not how many square feet exist. Our piece on DAS antenna spacing per floor shows how that count is worked out.

A vertical building also pays for riser cable, couplers and tap values on every floor regardless of how small each floor is. A tall, narrow tower with modest floor plates can therefore cost more per square foot than a wide low-rise, even though the radio physics is identical.

What actually drives the price of a BDA/DAS installation?

Six items account for most of the variation. These are the levers I check first when a client asks for a budget number:

• Antenna points: the count and the ceiling access needed to place them, including shielded areas such as plant rooms and lift lobbies.

• Cable and riser route: length of 1/2-inch and 7/8-inch coax (roughly 4.5 dB and 2.8 dB per 100 m at 450 MHz), and whether ELV riser access is available on every floor.

• Head-end: a 40 W (46 dBm) repeater or BDA, its filtering, and battery backup sized for the required hours.

• Acceptance standard: a 90 percent coverage target costs less than 95 or 99 percent in critical areas, and a design threshold of -95 dBm with a 10 dB fade margin needs more antennas than a bare pass mark.

• Retrofit or new build: cabling into an occupied building, with night works and ceiling reinstatement, costs substantially more than running it before the ceilings close.

• Survey, design, commissioning and licensing: published guides put design at about 10 to 15 percent of installed cost, and a grid survey adds a further per-square-foot line on top.

How much does the survey and design stage add?

The US benchmark from one integrator's 2025 guide puts a signal survey at about US$0.05 to US$0.15 per square foot for buildings up to 50,000 sq ft and US$0.10 to US$0.30 for larger or complex ones. It is worth paying for. A proper survey is what stops a contractor from over-designing with extra antennas or under-designing and failing acceptance, and both errors cost more than the survey.

What does a Singapore building owner need to add to a US benchmark?

Treat the US number as a shape, not a quote. Singapore adds IMDA licensing and type-approval for the repeater or BDA, the cost of appointing a licensed installer, and often a stricter environment for basements and long ELV risers in dense, high-rise stock. Labour rates, equipment pricing and currency differ from US projects. I would not put a Singapore dollar per-square-foot figure into a tender without a survey, and any vendor who quotes one before seeing the building is guessing. Get at least a walk-through and a grid survey of the worst floors first.

Related questions

Does a bigger building always cost more per square foot? No. Large open floor plates usually cost less per square foot because each antenna covers more area, while small, heavily partitioned or underground spaces cost more.

Is a BDA cheaper than a full DAS? A single repeater or BDA with a few antennas is cheaper when the dead zone is limited to one area, such as a basement. Once dead zones spread across many floors, a distributed system is needed. See our hotel BDA/DAS cost breakdown for a worked example.

What is the cheapest time to install one? During construction, before ceilings and risers are closed. Retrofitting an occupied building typically costs materially more.

How Suneast approaches budgeting

Suneast designs and installs in-building two-way radio coverage systems in Singapore, working from a walk-through and grid survey to a per-floor antenna placement plan, coupler schedule and bill of materials. We give budget ranges only after the survey and state the assumptions behind every number: frequency band, design threshold, fade margin and the coverage percentage being targeted. Speak to Suneast at suneast.com.sg for a survey-backed budget for your building.