Cass Allen
Cass Allen is a UK-based specialist environmental consultancy providing acoustic design, air quality and odour assessment, and construction monitoring services to developers, contractors, architects, and local authorities across seven built-environment sectors. Founded in 2000 and headquartered in Bedford, the firm has delivered over 3,000 projects.
- Company typePrivate
- Founded2000
- HeadquartersBedford, United Kingdom
- Headcount11–50
- GTM typeB2B
- OfferingServices
What Cass Allen does
Cass Allen is a UK-based specialist environmental consultancy founded in 2000 by Patrick Allen and headquartered in Bedford, with a regional office opened in Manchester in 2025. The firm delivers acoustic design consultancy, air quality and odour assessments, and construction noise, vibration, and dust monitoring services to developers, contractors, architects, and local authorities across seven vertical specializations: residential, offices & commercial, educational, healthcare & pharmaceuticals, hotels & leisure, entertainment & leisure, and industrial & infrastructure. Project work spans the full lifecycle from early planning through RIBA stages, detailed design, construction, and final testing/handover, supported by 3D computer noise modelling, dispersion modelling, vibration monitoring, and on-site testing capabilities.
Technically, Cass Allen combines traditional acoustic engineering with regulatory specialism in complex UK frameworks including the Building Safety Act Gateway 2 (with over 30 submissions supported), BREEAM (New Construction versions 6.1 and 7), Approved Document Part E, Building Bulletin 93 (BB93), HTM08-01 for healthcare, BS4142 for industrial noise, and BS8233. The firm holds Constructionline Silver, SMAS WorkSafe, and Compliance Chain Bronze accreditations. Its differentiator rests on in-house testing capabilities that generate proprietary compliance evidence rather than relying on manufacturer data, alongside a large archive of Part E test results used for value-engineering.
The business operates as a B2B professional services firm on a project-based revenue model. Pricing is quote-based per proposal under standard conditions of contract (effective 24.06.25), exclusive of VAT, valid for 60 days, with 30-day payment terms and monthly progress billing for extended engagements. The go-to-market is sales-led through direct enterprise relationships, augmented by CPD seminars, university guest lectures, technical content marketing, and industry events. There are no disclosed resellers or channel partners.
Cass Allen firmographics
Firmographics- Name
- Cass Allen
- Legal name
- Cass Allen Associates Ltd
- Website
- https://cassallen.co.uk
- Company type
- Private
- Founded year
- 2000
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Cass Allen is a UK-based specialist environmental consultancy providing acoustic design, air quality and odour assessment, and construction monitoring services to developers, contractors, architects, and local authorities across seven built-environment sectors. Founded in 2000 and headquartered in Bedford, the firm has delivered over 3,000 projects.
- Ownership category
- akta.pro rank
Where Cass Allen is headquartered
LocationHeadquarters
- HQ city
- Bedford
- HQ country
- United Kingdom
- HQ region
- Europe
Offices2 records
Markets served
Cass Allen business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure
Revenue model
- Consulting Services: Professional consulting fees for acoustic consultancy, air quality assessments, and construction monitoring services. Projects are carried out under standard conditions of contract with pricing per proposal.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Pay-as-you-go | Project-based professional services with custom pricing |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels9 records
Cass Allen product offering
Product offeringCore offering
Cass Allen is a specialist environmental consultancy providing acoustic design, air quality and odour assessment, and construction noise, vibration and dust monitoring services to UK developers, contractors, architects, and local authorities. Engagements span all RIBA stages from early planning and land purchase considerations through detailed design, construction, and pre-completion testing and handover, with services delivered against UK regulatory frameworks including Approved Document E, BREEAM, Building Safety Act Gateway 2, BB93, HTM08-01, BS4142, and BS8233.
Product overview
Cass Allen is a specialist environmental consultancy providing a unified suite of acoustic and air quality services to the development, construction, and infrastructure industries. Their core offerings consist of three interconnected consultancy services: Acoustic Consultancy Services (covering design, testing, and compliance across all RIBA stages), Air Quality & Odour assessments, and Construction Noise, Vibration & Dust Monitoring. These services are delivered across seven sector specializations: Residential, Offices & Commercial, Educational, Entertainment & Leisure, Healthcare, Hotels, and Industrial & Infrastructure. The company supports clients from early planning stages through detailed design, construction, and final testing and handover.
Differentiator
Problem solved
Functional benefit
Products and services
- Acoustic Consultancy Services Expert acoustic design and consulting for residential, commercial, education, healthcare, hotel, leisure, and mixed-use developments, covering all RIBA stages from concept and land purchase considerations through design, construction, on-site issue resolution, and pre-completion testing. Services include noise impact assessments, sound insulation design, façade acoustic design, building services noise control, BREEAM credit input, and Building Safety Act Gateway 2 submission support.
- Air Quality & Odour Air quality and odour assessment and consulting during the planning, design, and construction phases of development projects, including dispersion modelling of vehicle emissions and industrial sources, emissions mitigation assessments, and odour surveys.
- Construction Noise, Vibration & Dust Monitoring Monitoring solutions for large-scale construction sites, including noise, vibration, and dust assessments, Section 61 Applications under the Control of Pollution Act, and real-time monitoring regimes designed to minimise complaints and construction delays.
Quantifiable outcome
- Over 3000 successful projects delivered
- +3 more outcomes
Companies that use Cass Allen
Customer profileNamed customers13 records
Segments7 records
Ideal customer profiles6 records
Cass Allen technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Cass Allen partnerships and signals
Strategic signalPartnerships
53 partnerships are on record, tiered core and minor.
- Farrans ConstructioncoreAppointed by Farrans Construction to prepare Section 61 Assessment for the Gull Wing project - a new bridge over Lake Lothing in Lowestoft. Required pre-construction noise survey, detailed computer noise modelling, and monitoring regime for multiple construction phases.
- Midgard LtdcoreWorking with Midgard as part of their design team on Consort Place (formerly Alpha Square), a landmark development on Isle of Dogs owned by Far East Consortium. Cass Allen involved in all aspects of design from façade to internal sound insulation, mechanical plant and building services.
- Midgard LtdcoreAppointed as Acoustic Consultant through full design and build for Regents Crescent luxury residential development including internal walls and floors, façade design, building services, and mechanical plant.
- Shiva HotelscoreAppointed for detailed acoustic design of The BoTree luxury hotel in Marylebone with 199 rooms, restaurants, bars, cinema, nightclub and fitness suite.
- Taylor WimpeycoreSupported Taylor Wimpey in delivering acoustic design for Coronation Square landmark development in Leyton - hundreds of new homes with community centre, NHS health hub and leisure facilities including 6 basketball courts.
- MCD Heritage LtdcoreAppointed by MCD Heritage Ltd to monitor vibration levels in British Museum artefact storage rooms during underground tunnel repair works.
- BT plccoreCarried out noise chapter for full Environmental Impact Assessment for multi-turbine wind farm scheme in Suffolk as part of BT's 'wind for change programme' - largest corporate wind power project.
- DLP PlanningminorPlanning consultants engaged on multiple wind farm and solar farm projects including BT wind farms and Lark Energy solar projects.
- Lark EnergyminorProvided noise impact assessment advice for solar farms including Ellough Suffolk project and 13MWp Langford solar farm spanning approximately 60 acres.
- Highways AgencycoreDeveloped monitoring and modelling programme for A10 Wadesmill bypass to assess noise impact on dwellings, mitigate disturbance, and provide data for noise compensation claims.
- Mott MacdonaldminorEngineers on A10 Wadesmill bypass project working with Cass Allen on noise assessment programme.
- Volvo UKcoreEstablished acoustic feasibility for relocating Volvo Training and Development Centre within main office HQ with challenging acoustic requirements for vehicle repair training courses.
- Cushman & WakefieldminorProject managers for Volvo UK training HQ relocation acoustic assessment.
- Johnson & JohnsoncoreDesigned acoustic treatment for new cooler compound at pharmaceutical plant in High Wycombe to achieve stringent planning noise limits near dwellings and care home.
- ISS Facility ServicescoreCarried out acoustic assessment for Yacht Hotel in Royal Victoria Dock next to ExCeL London Exhibition Centre using 3D computer noise modelling.
- Morgan Sindall plccoreAcoustic design of Holiday Inn Winchester facade and internal partitions plus sound testing for building regulations compliance.
- Mace GroupcoreFive-year involvement from outline planning through discharge of conditions, detailed design, construction and commissioning for Premier Inn and data centre combined development in Ealing.
- BDL Group plccoreInvestigated poor sound insulation issues at Hilton Hotel Central London across moveable partitions between meeting rooms and conference areas.
- Lafarge AggregatescoreNegotiated planning noise criteria with council for quarry extension and demonstrated compliance through surveys at nearby dwellings.
- ISG Construction LimitedcoreAdvised on acoustic design and construction of £4.7m Dukeminster Estate care home and 90-bed residential care home at former Lannock School site.
- Vinci Construction UKcoreProvided acoustic design guidance for St Ann's Hospital refurbishment progressing through BREEAM, planning requirements and HTM08-01 compliance.
- BannatynecoreCarried out noise assessments for padel court installations at various Bannatyne fitness centres across the country for planning applications.
- Center ParcscoreAcoustic design for multiple Center Parcs resorts including Sherwood, Woburn, Longleat, Longford and Whinfell for apartments, spa facilities, mechanical plant and Sub-Tropical Swimming Paradise water parks.
- Helix TechnicalcoreNoise and vibration assessments for Star City Birmingham Capital Karts E-Karting facility including assessments for multiplex cinema above.
- AllenbuildcoreAcoustic design for performing arts centre in Hammersmith with structurally isolated auditorium beneath residential units.
- Levitate ArchitectscoreAcoustic advice for new leisure centre in Nottingham with 50-metre swimming pool using 3D computer modelling for acoustic quality.
- AllenbuildcoreAdvising on acoustic design for ambitious performing arts centre project in Hammersmith with auditorium and residential units above.
- Inspire Group & Clegg ConstructioncoreInternal acoustic design and compliance with acoustics related planning conditions for Peterborough College Green Technology Centre - BREEAM ratings.
- Bouygues UKcoreAcoustic design advice for Fareham College campus expansion including professional quality studio theatre, dance studio, music and media studios.
- Balfour BeattycoreAcoustic design for South Bristol Skills College with diverse spaces from vehicle maintenance to beauty therapy requiring detailed acoustic design.
- Leadbitter GroupcoreNoise surveys, 3D computer noise modelling, sound insulation design, reverberation calculations for new skills college in Fareham.
- United HousecoreDetailed acoustic design for new Medical Centre and Library in Clapham meeting HTM 08-01 acoustic criteria including library doubling as performance space.
- Cowlin ConstructioncoreAcoustic design for £23m Merchant's Academy Bristol to comply with Part E and Building Bulletin 93 with pre-completion tests.
- The Brit SchoolcoreAcoustic design for new performing arts building with studios, rehearsal and performance facilities to standards exceeding BB93.
- Morgan SindallcoreAcoustic design guidance for 2-storey Hampton Wick Primary School extension including 3D noise model and BB93 compliance.
- Anglia Ruskin UniversitycoreLibrary refurbishment acoustic work including transmission tests and 3D modelling for atria noise reduction.
- Studio Egret WestcoreInternal acoustic design for Clapham One Library including elliptical floor shape with diffusion treatment and music performance space.
- GHM Rock TownsendcoreAcoustic input for mixed-use residential/school development in Hackney with school facilities below 100 residential flats.
- R G CartercoreAcoustic design for Cancer Research UK Cambridge fit-out and Wellcome Trust Genome Campus Kitchen Garden Enclosure £9.7m development.
- Vinci Construction UKcoreSupporting Vinci Construction UK on St Ann's Hospital refurbishment including BREEAM, planning and HTM08-01 requirements.
- Sir Robert McAlpinecoreSt Ann's Hospital refurbishment acoustic design support for construction and civil engineering.
- Modus UnitechminorProject managers for Johnson & Johnson pharmaceutical plant cooling compound acoustic treatment.
- Cannon Corporate UK LtdcoreAcoustic design guidance for 136-room Crowne Plaza Hotel on Albert Embankment as part of Lambeth regeneration.
- Kailish EstatescoreBuilding envelope design for combined Travelodge hotel/residential/hostel scheme in Swindon to achieve planning noise limits.
- Chartfront / EGPLcorePlanning permission assistance for Travelodge Cambridge on main access route requiring high performance facade.
- Lanos (Salford Quays)coreBuilding envelope and internal partitions specification for Ramada Hotel in Salford Quays adjacent to busy dual carriageway.
- Beadmans LLPminorProject managers for Vandon House Hotel Westminster acoustic design.
- Dexter Moren AssociatescoreArchitects for Vandon House Hotel 53-bedroom boutique hotel with six residential apartments near Tube lines.
- Aedas RHWLcoreArchitects for Crowne Plaza Albert Embankment 16-storey hotel with 136 rooms, restaurant, lounge bar, spa and meeting facilities.
- AMA ArchitectscoreArchitects for University of Cambridge Department of Genetics mechanical plant assessment.
- GleedsminorConstruction consultants for Franklin Building Granta Park R&D office planning application.
- BMR – Granta Park Propco LtdcorePlanning application support for Research & Development office building in Cambridge with noise impact assessment.
- Blue Castle CapitalcoreAir Quality Assessment for landmark Central Square Cardiff mixed-use development with high-rise residential tower near Millennium Stadium.
Scale indicators4 records
Recent moves6 records
Expansion highlights5 records
Cass Allen competitors and assessment
Company assessmentBroad incumbents
- WSP Acoustics: WSP is a major global consultancy with an environmental and acoustics practice serving UK infrastructure, transport, and development projects. Its UK development acoustics work overlaps directly with Cass Allen's project mix.
- Arup Acoustics: Arup is a global multi-disciplinary engineering consultancy with a significant acoustics practice serving UK and international clients. While much larger and broader, its acoustic and environmental services compete for the same developer and infrastructure work as Cass Allen.
- Buro Happold: Buro Happold is an international engineering consultancy with built-environment acoustics and environmental services. It competes for high-profile UK development and infrastructure projects and represents the larger, multi-disciplinary end of the competitive set.
- Hoare Lea: Hoare Lea is a UK building services and environmental engineering consultancy with acoustics capability embedded in its MEP and sustainability practice. It competes for mid- and large-scale UK development projects that Cass Allen also targets.
Direct peers
- Sandy Brown: Sandy Brown is a UK-based independent acoustic consultancy offering design, assessment, and testing services across residential, commercial, education, and arts sectors. It is the closest direct UK specialist peer to Cass Allen in scope, client base, and delivery model.
- RBA Acoustics: RBA Acoustics is a UK acoustic consultancy providing building acoustics, environmental noise, and construction monitoring services. Their services and target client base (developers, architects, contractors) closely mirror Cass Allen's playbook.
- Mason UK (UK Acoustics): Mason UK is an independent acoustic consultancy offering noise impact assessments, building acoustics, and vibration services across the UK development and infrastructure sectors. It is a comparable mid-sized UK specialist acoustic firm.
- Adrian James Acoustics: Adrian James Acoustics is a UK-based acoustic consultancy with a similar portfolio across residential, commercial, and educational developments. Comparable specialist positioning and client mix to Cass Allen.
- Noise Solutions: Noise Solutions is a UK acoustic consultancy providing planning noise assessments, sound insulation design, and construction monitoring. It competes directly with Cass Allen for mid-market developer and contractor mandates.
Emerging players
- Cundall: Cundall is an international multi-disciplinary engineering consultancy with acoustics and building performance services. It is growing its UK acoustic and environmental consulting footprint and is increasingly competitive on developer-driven mandates.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights6 records
Customer concentration
Cass Allen social profiles
Digital presenceCass Allen compliance and trust
Trust signalCompliance3 records
Cass Allen financial estimates
Financial estimateRevenue estimate
Valuation estimate
Cass Allen leadership team
Management profileNumber of profiles
Profiles7 records
Cass Allen funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Cass Allen M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Cass Allen
What does Cass Allen do?
Cass Allen is a specialist environmental consultancy providing acoustic design, air quality and odour assessment, and construction noise, vibration and dust monitoring services to UK developers, contractors, architects, and local authorities. Engagements span all RIBA stages from early planning and land purchase considerations through detailed design, construction, and pre-completion testing and handover, with services delivered against UK regulatory frameworks including Approved Document E, BREEAM, Building Safety Act Gateway 2, BB93, HTM08-01, BS4142, and BS8233.
Is Cass Allen a public or private company?
Cass Allen is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Cass Allen founded?
Cass Allen was founded in 2000. It employs 11 to 50 people.
Where is Cass Allen based?
Cass Allen is headquartered in Bedford, United Kingdom, in the Europe region.
How does Cass Allen make money?
One revenue line is on record: consulting Services.
Who are Cass Allen's main competitors?
Broad incumbents on record are WSP Acoustics, Arup Acoustics, Buro Happold and Hoare Lea. Direct peers are Sandy Brown, RBA Acoustics, Mason UK (UK Acoustics), Adrian James Acoustics and Noise Solutions. Cundall is listed as an emerging player.
Does Cass Allen have an API?
No public API is recorded for Cass Allen.