Acoustic Cut-List Criteria for Open-Plan Offices
In the value engineering round, only a specification that states a citable effect and a measurable target value stays on the cut list.
Evidence, put to work
A worksheet applies scientific analysis to your daily work. It shows what you need: numbers, thresholds, sources and how to put them to work. 67 worksheets
In the value engineering round, only a specification that states a citable effect and a measurable target value stays on the cut list.
When the value engineering round arrives, a lighting specification survives only if you can name the number that defends it.
Wargocki and colleagues recorded roughly 20 per cent higher task performance at 20 °C than at 30 °C: a stated performance loss like that is what keeps a cooling setpoint off the cut list.
A daylight specification clears the value engineering cut only when its benefit is stated as a number, such as an sDA of 300 lx over 50 per cent of the plane, that a client can weigh against the cost of the glazing or the shading system.
A lighting line clears value engineering only when its benefit names a number, such as 500 lx or a UGR of 19, and cites a standard.
Lohr and colleagues recorded 12 per cent quicker reaction times when plants entered a room. Budget owners strike planting lines that lack a number like that.
When the value engineering round opens and the glazing spec is on the chopping block, you defend a nature view only by naming the effect figure that justifies it.
In the value engineering round, a quantity surveyor keeps an acoustic specification only when it states a measurable target, such as ISO 3382-3's D2,S of 7 dB.
The ventilation specification survives the value engineering round when a client can weigh a number for the benefit against the saving.
Acoustic performance feeds the quality-to-rent-premium-to-exit-value chain the owner underwrites, yet the market prices it through a label average that says nothing about which measure earned it.
A lighting spec feeds the certification score that the market prices your building on, whether or not any single measure earned the premium.
Daylight quality feeds the asset-value case through a chain from measured performance to rent premium to exit value, but the premium your building trades on is a label average that says nothing about which single measure earned it.
A certification premium prices your building on a category average, and no line in that average tells you whether the plants or the water feature earned it.
Certification is tied to a rent premium in the exit price on average, so the lighting spend is priced whether or not any single measure earned it.
A certification premium prices the whole label into rent and exit value, but it never tells you which single measure inside the building earned it.
Acoustic performance sits inside the certification premium the market already prices into your asset, yet the label average tells you nothing about whether any single acoustic measure earned it.
Temperature set points sit inside the certification your building is priced on, yet the rent premium attached to the label is a category average that says nothing about whether this one measure earned it.
A certification's rent premium prices your building on a category average, so the ventilation spend that earns the label is only as defensible as the standard you require against it.
Air quality is a staff-cost lever before it is an energy line, because the people in the building cost far more per square metre than the rent or the ventilation that serves them.
Background noise in an open-plan office reaches your committee as a staff-cost line, because a small performance loss per head outweighs the acoustic fit-out that would have prevented it.
Lighting specification lands on the staff-cost line of the occupier's business case, where a fraction of a working day per person per year outweighs the fit-out premium of getting it right.
Daylight decisions land on the staff-cost line of your occupancy case, where a fraction of a per cent of performance outweighs the rent and energy you meter per head.
Lighting specifications sit inside the lease and fit-out decisions you sign off, and the cost of getting them wrong lands on staff productivity rather than on the energy line.
Because staff cost per head dwarfs rent and energy, a fraction of a sick day or a small reaction-time loss per person outweighs what greenery and water features cost to install and maintain.
Staff cost per head dwarfs rent and energy, so a small performance loss from a poor environment outweighs the cost of getting the nature view right.
On a per-head basis staff cost dwarfs rent and energy, so an acoustic environment that shaves a few per cent off sustained attention costs more than the fit-out that would have fixed it.
A set point drifting a few degrees from the comfort band costs more in lost cognitive output per head than the energy saved on the meter.
Acoustic quality reaches your rent roll only through the people in the building, and only the first link of that chain is backed by solid evidence.
Air quality reaches your rent roll only through the people who occupy the space, and only the first link of that chain is graded solid.
Circadian lighting reaches a building's income only through the people inside it, and only the first link of that chain is graded solid.
Daylight underwrites a rent and value case only through the people in the building, and only the first link of that chain rests on measured evidence an appraisal can use.
The room temperature you set, the humidity you hold and the quiet you buy reach your ADR and RevPAR only through the guest's body, and only the first link of that chain carries hard numbers.
The acoustic spend on a guest room reaches your pro forma only through rate, occupancy and review scores, and only the first link of that chain is evidenced.
PM2.5 costs the sleeping guest 0.55 hours of sleep per standard-deviation rise; the step from there to rate and occupancy is not yet evidenced.
Plants and water features move the people in a building before they move a rent roll, and only the first link of that chain is graded solid.
Lighting quality only reaches your rent roll through the people who occupy the space, and only the first link of that chain rests on evidence you can underwrite.
Nature views move the people in a building before they move a rent roll, and only the first link of that chain is solid enough to underwrite.
Balneotherapy and sauna use reduce measured stress and fatigue with effect sizes from 0.8 to 2.3 against no treatment, but no supplied evidence ties that guest-level change to a room rate, an occupancy point or a spa's payback.
Acoustic quality reaches your rent roll only through the people in the building and only the first link of that chain is graded solid.
Temperature control moves cognitive performance in occupants; whether it moves rent, yield or one building's revenue is a far weaker claim.
Boubekri and colleagues found 37 more minutes of sleep and a 42 per cent gain on decision-making tasks at 316 versus 40.6 equivalent melanopic lux: the number for a lease or fit-out brief.
You own how the office affects your people. Facilities and finance set the ventilation budget, and the effect on your people is what you answer for. This sheet gives you the figure to raise with them.
Workers in an optimised daylight and views condition slept 37 minutes longer and scored 42 per cent higher on higher-order decision tasks. You own that effect on your people, not the fit-out budget it takes to capture it.
You own how the space affects your people yet not the lighting budget, so you need a number ready for when the CFO asks what a lux target buys.
You own the effect of the workplace on people yet not the fit-out budget, and the plant line is the one a CFO can check against a number, not decoration.
Workers in an optimised daylight-and-views office slept 37 minutes longer and scored 42 per cent higher on cognitive tests, though no supplied study yet converts that into retention or sick-day figures.
You answer for how the open-plan floor affects your people, but the acoustic fit-out is funded from a budget you do not control, and your satisfaction score misses the 2 per cent absenteeism drop and other performance effects documented below.
The acoustic complaints in your survey trace to intelligible speech at nearby desks, and the evidence base is strong enough to defend a fit-out line before the CFO.
You answer for how the workplace affects your people, but facilities sets the thermostat and finance signs off the fit-out budget.
The air quality claim a compliance officer can sign off on is the one you can measure and cite, and this sheet gives you that sentence before the copy goes to the owner.
A compliance reviewer signs off on the lighting claim on your exposé only when it names the WELL v1 or EN 12464-1 threshold behind it and stops short of promising sleep, mood or alertness gains for the tenant.
A daylight claim only sells if it passes compliance sign-off, so the checkable sentence is what a compliance reviewer verifies.
A lighting claim clears compliance review when it names a standard's own number, such as 500 lx maintained or a UGR of 19; a health or productivity promise has no such number to check.
Compliance sign-off tests every claim about greenery or water. The evidenced sentence is the one that passes.
For the real estate marketing lead: a nature-view study measured 37 extra minutes of sleep under one tested condition, and this worksheet sets the boundary an exposé sentence must keep to pass an advertising review.
NC 30, about 35 dBA, is a claim a reviewer can check on the finished floor, and that measured figure is the one a compliance sign-off verifies.
A measured claim, such as a decay rate or an STI value, sells the acoustic fit-out, because a surveyor can check it against a published standard, and no standard exists for 'comfort' or 'wellbeing'.
EN 16798-1 sets the Category II comfort band at 20.0 to 24.0 °C heating and 23.0 to 26.0 °C cooling, the number an advertising review checks a temperature claim against.
Circadian lighting has evidence solid for mood and moderate for sleep, both strong enough for a capex paper. Daytime alertness does not clear that bar.
Daylight's effect sizes, a 37-minute sleep gain and a 42 per cent cognition gain, are large enough to defend in a capex paper, and Schöllhorn's null on alertness names the exact limit.
Illuminance has hard standards behind it, so a lighting line comes with figures a finance committee can verify.
Greenery earns a line in the fit-out budget on cognitive and physiological grounds, but the field measurements will not carry the productivity claim you want to put in front of finance.
Boubekri and colleagues measured 37 more minutes of sleep and a 42 per cent gain on cognitive scores: a capex paper defends that figure only by naming the author and the limit a finance committee will probe first.
Background noise crosses a measured threshold at STI 0.21 and peaks at STI 0.44, a citable performance loss you can defend line by line in a capex paper.
A finance committee approves acoustic capex only when the speech intelligibility figures behind it trace to a named study and a stated threshold.
A temperature shift is worth a 6 to 20 per cent swing in cognitive performance, evidence strong enough to justify a capex case built on the EN 16798-1 band.
Ventilation raises information-processing performance by 1.7 to 7.4 per cent, an effect size specific enough for a line in a capex paper.
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