LAEQ,T
LAEQ (or LAeq) refers to Level A weighted Equivalent Continuous Sound Pressure and T refers to time, so it is a metric used in acoustics to quantify the average sound energy of a fluctuating noise over a specific time period. It represents the constant noise level that would produce the same sound energy over the same period as the actual fluctuating noise.It is often used in environmental noise standards and regulations, most recently in particular connected with the noise produced by air source heat pumps and wind turbines. See article equivalent continuous sound pressure level, heat pump and wind turbine sound calculations, as well as sound, sound absorption, sound absorption coefficient, and noise v sound.
For the purposes of the consultation Permitted development rights for small scale renewable and low carbon energy technologies and electric vehicle charging infrastructure March 2012 LAEQ,T refers to 'The equivalent continuous sound level - the sound level of a notionally steady sound having the same energy as a fluctuating sound over a specified measurement period (T). LAEQ, 5 min – refers to the equivalent continuous sound level over a 5 minute period.' The consultation also notes that the term 'Could benefit from further clarification'.
[edit] Related articles on Designing Buildings
- Air source heat pumps.
- Biomass.
- BSRIA domestic hot water heat pumps testing.
- Domestic building services compliance guide.
- Feed-In tariff.
- Ground source heat pump.
- Making the most of renewable energy systems DG 531.
- Microgeneration certification scheme
- Micro CHP.
- Micro grid.
- Microgeneration.
- Noise v sound.
- Non-domestic building services compliance guide.
- Pre-completion sound testing.
- Renewable energy.
- Renewable Heat Incentive.
- Renewable Energy Consumer Code RECC.
- Solar photovoltaics.
- Solar thermal.
- Sound.
- Sound absorption.
- Sound absorption coefficient.
- Sound frequency.
- UKAS accreditation for sound absorption testing.
- Wind turbine.
Featured articles and news
A case study and a warning to would-be developers
Creating four dwellings... after half a century of doing this job, why, oh why, is it so difficult?
Reform of the fire engineering profession
Fire Engineers Advisory Panel: Authoritative Statement, reactions and next steps.
Restoration and renewal of the Palace of Westminster
A complex project of cultural significance from full decant to EMI, opportunities and a potential a way forward.
Apprenticeships and the responsibility we share
Perspectives from the CIOB President as National Apprentice Week comes to a close.
The first line of defence against rain, wind and snow.
Building Safety recap January, 2026
What we missed at the end of last year, and at the start of this...
National Apprenticeship Week 2026, 9-15 Feb
Shining a light on the positive impacts for businesses, their apprentices and the wider economy alike.
Applications and benefits of acoustic flooring
From commercial to retail.
From solid to sprung and ribbed to raised.
Strengthening industry collaboration in Hong Kong
Hong Kong Institute of Construction and The Chartered Institute of Building sign Memorandum of Understanding.
A detailed description from the experts at Cornish Lime.
IHBC planning for growth with corporate plan development
Grow with the Institute by volunteering and CP25 consultation.
Connecting ambition and action for designers and specifiers.
Electrical skills gap deepens as apprenticeship starts fall despite surging demand says ECA.
Built environment bodies deepen joint action on EDI
B.E.Inclusive initiative agree next phase of joint equity, diversity and inclusion (EDI) action plan.
Recognising culture as key to sustainable economic growth
Creative UK Provocation paper: Culture as Growth Infrastructure.