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 safe energy transition – ECA launches a new Charter
Practical policy actions to speed up low carbon adoption while maintaining installation safety and competency.
Frank Duffy: Researcher and Practitioner
Reflections on achievements and relevance to the wider research and practice communities.
The 2026 Compliance Landscape: Fire doors
Why 'Business as Usual' is a Liability.
Cutting construction carbon footprint by caring for soil
Is construction neglecting one of the planet’s most powerful carbon stores and one of our greatest natural climate allies.
ARCHITECTURE: How's it progressing?
Archiblogger posing questions of a historical and contextual nature.
The roofscape of Hampstead Garden Suburb
Residents, architects and roofers need to understand detailing.
Homes, landlords. tenants and the new housing standards
What will it all mean?
The Architectural Technology podcast: Where it's AT
Catch-up on the latest episodes.
Edmundson Apprentice of the Year award 2026
Entries now open for this Electrical Contractors' Association award.
Traditional blue-grey slate from one of the oldest and largest UK slate quarries down in Cornwall.
There are plenty of sources with the potential to be redeveloped.
Change of use legislation breaths new life into buildings
A run down on Class MA of the General Permitted Development Order.
Solar generation in the historic environment
Success requires understanding each site in detail.
Level 6 Design, Construction and Management BSc
CIOB launches first-ever degree programme to develop the next generation of construction leaders.
Open for business as of April, with its 2026 prospectus and new pipeline of housing schemes.
The operational value of workforce health
Keeping projects moving. Incorporating unplanned absence and the importance of health, in operations.
A carbon case for indigenous slate
UK slate can offer clear embodied carbon advantages.
Costs and insolvencies mount for SMEs, despite growth
Construction sector under insolvency and wage bill pressure in part linked to National Insurance, says report.