What Determines the Price of a Shielded Room? 6 Factors to Know Before Getting a Quote
Two shielded rooms may look the same and still be priced very differently. We explain the main cost factors one by one.
3 min readSeptember 2, 2026
Why Does the Specification Matter So Much?
Comparable shielded room quotes depend on a clear specification. A vague text leads companies to quote with different materials, different test methods and different door types; in the end, the lowest price is often the most incomplete solution.
A good specification states clearly what the room will be used for, what performance it must deliver and how that performance will be proven. That way the purchasing team and the bidders are looking at the same target.
Values You Must State
The first item is the signal blocking level: how many dB across which frequency range? A statement such as at least 100 dB from 10 kHz to 18 GHz is far more useful than "high performance". The measurement standard should be written next to it; EN 50147-1 or IEEE 299 is usually preferred.
Then list the internal dimensions, the number and type of doors, the current ratings of the power lines to be filtered, whether data lines are fiber or copper, and the ventilation requirement. The number of people working inside also directly affects the air conditioning and lighting design.
Common Mistakes
The most common mistake is asking for a dB value without specifying the test method. If measurement points and frequencies aren't stated, everyone defends their own method at handover. The second mistake is not defining the door separately, even though the door is where leaks occur most often.
The third mistake is forgetting maintenance and warranty terms. Gaskets wear over time; if the specification doesn't require annual measurement and spare parts support, the room can lose its original performance within a few years.
Acceptance and Documentation Requirements
The specification should also list the documents delivered at handover: a signed test report, material certificates, as-built drawings, maintenance instructions and a training record. These documents help both in audits and in future modifications.
Stating that an independent body may attend the acceptance measurement also builds confidence. On every project we support purchasing teams with a draft specification and compliance table.
Frequently Asked Questions
What dB value should the specification require?
It depends on the use. To reliably block phone and Wi-Fi signals, 80–100 dB is usually enough; TEMPEST and military applications require higher values.
Can we ask the supplier for a draft specification?
Yes. We prepare a free draft tailored to your needs; your organization then edits the final text to its own rules.
Who performs the acceptance measurement?
The installing company performs it; if you wish, an independent body or your own team can also attend.
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