How Long Does It Take to Install and Commission an In-Building Two-Way Radio (BDA/DAS) System in a Singapore Building?

For a typical mid-sized Singapore building — say a 15-to-25 storey commercial block or a hotel of a few hundred keys — expect four to eight weeks from signed order to a passed acceptance test, assuming the design is clean and access is granted on time. A small single-basement carpark or a low-rise can be done in one to two weeks. A large hospital, mall, or transport terminal with several hundred antennas runs three to six months. The build itself is rarely the bottleneck; the survey, the design sign-off, IMDA licensing, and site access windows are what actually set the calendar.

I have commissioned enough of these to know the honest answer is "it depends on the building, not the box." Below is how the weeks actually break down.

What are the phases, and how long does each take?

Every in-building coverage job moves through the same five phases. Here are realistic durations for a mid-sized building:

• Site survey and benchmarking: 1–3 days on site. We walk the building with a signal generator and a scanning receiver, measure the existing level in every zone against the −95 dBm reliable-voice threshold, and read the floor plate, core, and riser layout off the CAD file.

• Design and BOM: 1–2 weeks. Link budget (downlink and uplink both), antenna placement plan, coupler/tap schedule, and bill of materials. This is desk work and can overlap procurement.

• Procurement: 2–6 weeks, often in parallel. The repeater or BDA, antennas, couplers, and coax are usually stocked, but long 7/8" trunk runs and IMDA type-approved head-end units can carry lead time.

• Installation: 3 days to 4 weeks. Cable pulls through the ELV risers, antenna mounting, head-end rack, power and monitoring. Scales directly with antenna count and how many floors need after-hours access.

• Commissioning and acceptance test: 2–5 days. Power-up, gain and isolation setting, then the grid coverage survey that the building has to pass.

Phases two and three overlap, which is why the elapsed time is shorter than the sum. The number that surprises clients is installation, because it is governed by access, not labour.

Why does access, not equipment, drive the schedule?

A DAS is a cabling job before it is a radio job. Most of the man-hours go into pulling coax vertically through the ELV risers and horizontally across each floor to the antenna positions. In an occupied hotel or hospital you cannot do that during business hours — you get night windows, one or two floors at a time, and the programme stretches accordingly. Riser access on tenanted floors, hot-work permits, and coordination with the fire and ELV contractors are the items that slip. When a job runs late in Singapore, nine times out of ten it is a permit or an access window, not a missing part.

How long does commissioning and the acceptance test take?

Commissioning is quick if the design was right. We power the head-end, set the repeater or BDA gain, and — for any off-air BDA — confirm donor-to-service antenna isolation exceeds the amplifier gain by a safe margin to stop oscillation. Then comes the acceptance test: the building is divided into a grid (commonly 20 cells per floor), and each cell is measured for received signal and audio quality. The pass criterion is a delivered level at or above roughly −95 dBm across at least 95% of the floor area, with critical areas — stairwells, lift cars, basements — held to a higher bar. A clean system passes the grid coverage survey in a day or two. A design built to only 10 dB fade margin instead of 15 dB in critical zones is where re-tests come from, and a re-test adds a week.

What can add weeks to the timeline?

Three things, mostly. First, licensing: an on-site repeater needs an IMDA station licence and type-approved equipment, and that paperwork should be started at design, not at handover — see IMDA licensing for in-building repeaters and boosters. Second, a failed benchmark that changes scope — if the survey finds the building is worse than assumed, antenna count goes up and so does the cable pull. Third, structural surprises: lead-lined radiology rooms, RF-shielded MRI suites, or double-basement walls that need a dedicated antenna the original count did not carry.

Related questions

Can it be done faster if it is urgent? Yes, within limits. Parallelising procurement with design, and securing 24-hour riser access instead of night-only windows, can compress a mid-sized job to two or three weeks. You cannot compress the acceptance test or the IMDA licence.

Does the annual re-test take as long as the first commissioning? No. The annual verification of active components and a spot-check coverage survey is typically a one-day exercise, not a full install cycle.

When should I engage an integrator relative to my building programme? At design stage, ideally before the ELV riser layout is frozen. Retrofitting coax into a completed riser is slower and more disruptive than designing the DAS route in from the start.

How Suneast handles this

Suneast surveys, designs, installs, and commissions in-building two-way radio coverage systems across Singapore, and we hold the IMDA station licence and type-approval paperwork as part of the delivery rather than leaving it to the client. We size the antenna count and coupler schedule to a 15 dB fade margin in critical areas so the system passes its acceptance grid on the first attempt, and we plan riser and after-hours access up front so the programme reflects the real building, not an optimistic one.