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
The Architectural Technology podcast: Where it's AT
Catch up for free, subscribe and share with your network.
The Association of Consultant Architects recap
A reintroduction and recap of ACA President; Patrick Inglis' Autumn update.
The Home Energy Model and its wrappers
From SAP to HEM, EPC for MEES and FHS assessment wrappers.
Future Homes Standard Essentials launched
Future Homes Hub launches new campaign to help sector prepare for the implementation of new building standards.
Building Safety recap February, 2026
Our regular run-down of key building safety related events of the month.
Planning reform: draft NPPF and industry responses.
Last chance to comment on proposed changes to the NPPF.
A Regency palace of colour and sensation. Book review.
Delayed, derailed and devalued
How the UK’s planning crisis is undermining British manufacturing.
How much does it cost to build a house?
A brief run down of key considerations from a London based practice.
The need for a National construction careers campaign
Highlighted by CIOB to cut unemployment, reduce skills gap and deliver on housing and infrastructure ambitions.
AI-Driven automation; reducing time, enhancing compliance
Sustainability; not just compliance but rethinking design, material selection, and the supply chains to support them.
Climate Resilience and Adaptation In the Built Environment
New CIOB Technical Information Sheet by Colin Booth, Professor of Smart and Sustainable Infrastructure.
Turning Enquiries into Profitable Construction Projects
Founder of Develop Coaching and author of Building Your Future; Greg Wilkes shares his insights.
IHBC Signpost: Poetry from concrete
Scotland’s fascinating historic concrete and brutalist architecture with the Engine Shed.
Demonstrating that apprenticeships work for business, people and Scotland’s economy.
Scottish parents prioritise construction and apprenticeships
CIOB data released for Scottish Apprenticeship Week shows construction as top potential career path.
From a Green to a White Paper and the proposal of a General Safety Requirement for construction products.
Creativity, conservation and craft at Barley Studio. Book review.
The challenge as PFI agreements come to an end
How construction deals with inherited assets built under long-term contracts.
Skills plan for engineering and building services
Comprehensive industry report highlights persistent skills challenges across the sector.
Choosing the right design team for a D&B Contract
An architect explains the nature and needs of working within this common procurement route.
Statement from the Interim Chief Construction Advisor
Thouria Istephan; Architect and inquiry panel member outlines ongoing work, priorities and next steps.