Why the Lowest Railing Bid Almost Always Costs You More

Three railing bids come in on a 340-unit tower: $2.9 million, $3.1 million and $2.35 million. The low bid is 19 percent under the next one and 24 percent under the high. Nobody in this trade has a 24 percent cost advantage. Aluminum costs what aluminum costs, glass costs what glass costs, and installers earn the same rates in the same city. When a railing bid is that far below the field, the difference is almost never efficiency. It is scope that has been moved out of the number and onto you.

Read the exclusions before the price

Most railing proposals put the number on page one and the exclusions on page three. Reverse the order. The exclusions page is where the bid spread actually lives, and it is usually a short list of expensive words.

• Engineering by others, or design excluded. The bidder has priced fabrication of a design somebody else has to stamp.
• Anchors and embeds by others. The fasteners, the cast-in plates or the edge blocking are now a concrete or general contractor scope item, often discovered after the pour.
• Substrate assumed adequate. The bidder has priced as though the slab edge is straight, square and structurally sound. It rarely is.
• Access from balcony only. If the crew cannot reach the work from inside, swing stage or boom time becomes a change order.
• Freight and offloading excluded, or crane by others. Glass crates and extrusion bundles do not offload themselves.
• Deliveries in one drop. A single-drop assumption on a 40-storey tower is an assumption about your schedule, not theirs.
• Winter conditions excluded. Heat, hoarding and reduced productivity are priced later, at whatever the market will bear.

None of these exclusions are dishonest. They are legitimate ways to narrow a scope. The problem is that a bid comparison spreadsheet with one number per bidder makes an unexcluded proposal look expensive and an exclusion-heavy proposal look sharp, when the two are describing different amounts of work.

The engineering gap

Guards are life-safety elements. They have to be designed for the specified loads, the anchorage has to be checked against the actual substrate, and in most Canadian jurisdictions the shop drawings have to be sealed by a professional engineer licensed in that province. Somebody pays for that. When it is excluded from the railing price, it typically comes back as a deferred design engagement in the $8,000 to $25,000 range for a mid-size building, plus review cycles, plus schedule.

The schedule cost is usually the larger one. A third-party engineer working from someone else's shop drawings will iterate. Two or three review rounds at ten business days each will consume six weeks, and railings sit on the critical path for occupancy in almost every high-rise. Having the stamp come from inside the fabricator, working from their own connection details and their own test history, removes both the fee and most of the iteration.

The anchorage assumption

The most expensive line in a cheap railing bid is the one that is not written down: the assumption about how the guard attaches. Concentrated loads at the top of a guard generate substantial moments at the base, and those moments have to go somewhere. On a face-mounted system that somewhere is the slab edge, which means edge distance, rebar cover and concrete quality all matter. A bidder who has priced a generic anchor without checking the edge condition has not saved you money. They have deferred a structural question.

When that question gets answered on site and the answer is unfavourable, the fixes are all costly: epoxy anchors with longer embedment, supplementary steel angles, a change from face-mount to top-mount with a new waterproofing detail, or in bad cases a structural repair. It is not unusual for slab edge remediation to add $40 to $120 per linear foot across the affected area, which on 4,000 linear feet is a bigger number than the original bid spread.

Nobody in this trade has a 24 percent cost advantage. When a bid is that far below the field, you are not buying a discount. You are buying an argument you have not had yet.

The deficiency tail nobody prices

Installation quality shows up eighteen months after the low bid was accepted, on a deficiency list, in front of a purchaser doing a pre-delivery inspection. Racked panels, inconsistent gaps, fasteners at different depths, a glass panel with a bruised edge that eventually breaks. Each item is small. The cost of fixing them is not, because the fix requires remobilizing a crew to an occupied building.

Remobilization on a completed high-rise typically runs $2,500 to $6,000 per day once you account for crew, hoist or swing stage time, building access coordination and resident notification. Two weeks of punch list work on a badly installed package is $25,000 to $60,000 that appeared in nobody's budget. If the original installer was a subcontracted crew that has since moved to another province, that work gets done by somebody else, at a premium, without the benefit of anyone who remembers how the system went together.

How to level railing bids properly

Levelling this trade takes about ninety minutes and saves a disproportionate amount of grief. Issue a short list of mandatory clarifications with the tender and require every bidder to answer them in writing on the same page.

• Is professional engineering, including sealed shop drawings for the province of the work, included in the price? Name the engineer or state that it is in house.
• State the assumed anchorage and the assumed substrate condition, including required edge distance and concrete strength.
• Are all anchors, fasteners, embeds, shims and sealant included?
• Who performs the installation: your direct employees, or a subcontracted crew? If subcontracted, name the firm.
• What is the assumed number of deliveries and the assumed access method?
• What is the price validity period and what escalation mechanism applies after it?
• What is the warranty on finish, on glass, and on workmanship, and who honours it?
• What is the replacement lead time for a single broken glass panel two years after handover?

That last question is more revealing than it looks. A supplier who imports a container of glass on a twelve-week cycle will answer it very differently from one who fabricates domestically. It is also the question that will matter most to your property manager, long after everyone involved in the tender has moved on.