REDSIX PARTNERSHIP LTD

What REDSIX PARTNERSHIP LTD does

RedSix Partnership Ltd is a private UK sustainability consultancy headquartered in Cardiff with offices in Bristol and London, founded in 2015 and registered as a limited company in England and Wales. The firm delivers environmental certification, Net Zero Carbon strategy, and ESG advisory services to the built environment, specialising in BREEAM assessments (New Construction, In-Use, and Residential schemes), AECB CarbonLite certification, whole life carbon and embodied carbon analysis, energy modelling (SAP/SBEM), overheating analysis, GRESB reporting, MEES audits, and PAS 2035 retrofit coordination. RedSix serves developers, architects, contractors, and public sector clients across the UK, with notable projects including the UK's highest BREEAM-rated educational building (Aeron Valley School, 93.69%), INEOS Grenadier's Bridgend manufacturing facility, Ferne Park (BREEAM Outstanding 92.11%), Sheffield Business Park, and the Bottleworks Guildford heritage refurbishment. The consultancy operates on project-based, quote-driven engagements with no publicly disclosed pricing, monetising accredited expertise through fee-for-service work and, more recently, Carbon Literacy training and bespoke CPD sessions.

Name

REDSIX PARTNERSHIP LTD

Legal name

RedSix Partnership Ltd

Website

https://red-six.co.uk

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

1–10 employees

Short description

RedSix Partnership Ltd is a UK-based sustainability consultancy delivering BREEAM assessments, Net Zero Carbon strategies, embodied carbon analysis, and ESG advisory services to developers, architects, contractors, and public sector clients across the built environment, operating from Cardiff, Bristol, and London.

Ownership category

akta.pro rank

Product category

Built Environment Sustainability Consultancy

NAICS

Environmental Consulting Services (541620)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Regulatory & Disclosure Strategy (CSRD/ESRS, ISSB/IFRS S2, SEC, TCFD) (EUABAKAH)

akta.pro secondary industries

Benchmarking, Ratings & Stakeholder Reporting Portals (Scorecards, Dashboards) (EUABAEAJ), Climate Governance, Operating Model & Internal Carbon Pricing Design (EUABAKAF)

Keywords

• Sustainability consultancy
• BREEAM assessment services
• Net Zero Carbon strategies
• Embodied carbon analysis
• Built environment consulting

Headquarters

HQ city

Llanelli

HQ country

United Kingdom

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Sustainability Consultancy Services: Project-based consultancy fees for BREEAM assessments, Net Zero Carbon strategies, embodied carbon analysis, ESG consultancy, and compliance guidance across the construction lifecycle from planning to post-occupancy.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

REDSIX PARTNERSHIP LTD provides sustainability and environmental consultancy services for the UK built environment, delivering BREEAM assessments, Net Zero Carbon and decarbonisation strategies, embodied and whole-life carbon analysis, ESG/sustainability reporting, energy performance compliance (EPC, SAP, SBEM, MEES), building health and connectivity certifications (WELL, Fitwel, WiredScore), overheating risk assessments, and accredited Carbon Literacy and CPD training to developers, architects, contractors, and public-sector clients.

Product overview

RedSix Partnership Ltd is a sustainability consultancy offering a comprehensive portfolio of assessment, certification, and advisory services for the built environment. Their core service offering includes BREEAM assessments (spanning New Construction, In-Use, and Residential schemes), Net Zero Carbon strategies, embodied carbon and Life Cycle Assessment (LCA) analysis, and energy performance certifications (EPC, SAP, SBEM). These services are complemented by WELL Building and Fitwel certification consultancy, overheating analysis (CIBSE TM52/TM59), circular economy assessments, and ESG consultancy. The company also provides sector-specific services including GRESB reporting, MEES audits, PAS 2035 retrofit coordination, and WiredScore certification. On the training side, RedSix offers an accredited Carbon Literacy Course (a one-day certified program for construction professionals) and Bespoke CPD sessions on topics like BREEAM V7 and Net Zero Carbon. The firm operates across industrial, retail, commercial, residential, healthcare, education, leisure, and care accommodation sectors throughout the UK.

Differentiator

Problem solved

Functional benefit

Products and services

• BREEAM Assessment Services Independent BREEAM assessor services across New Construction, Refurbishment & Fit-Out, In-Use, Communities, Sustainability Rating, BIUFO, and CEEQUAL schemes, delivered to developers, contractors, architects, and public-sector clients seeking certified sustainability outcomes for built environment projects.
• Net Zero Carbon & Decarbonisation Strategy Consultancy Net Zero Carbon strategies, decarbonisation strategies, embodied carbon roadmaps, and asset-level decarbonisation planning for new-build, refurbishment, and existing estate portfolios, delivered to corporate, developer, and public-sector clients pursuing verified Net Zero outcomes.
• Embodied Carbon & Whole Life Carbon Assessment Embodied carbon analysis and whole life carbon assessments using the OneClick LCA tool to quantify operational and embodied impacts across building lifecycles, for developers, contractors, and design teams needing carbon-baseline data and reduction planning.
• Energy Performance & Compliance Services EPC, SAP, SBEM, MEES compliance, thermal bridging analysis, and energy modelling using IES Virtual Environment, delivered to developers, landlords, and public-sector clients to meet building regulations and minimum energy efficiency standards.
• Building Health, Wellbeing & Connectivity Certifications WELL, Fitwel, WiredScore, and NAPS accreditation support, advising landlords, developers, and occupiers on indoor environmental quality, occupant wellbeing, and digital connectivity certification for commercial and residential buildings.
• ESG & Sustainability Reporting Consultancy ESG strategy and reporting support including GRESB benchmarking, CSRD, TCFD, and SECR disclosure advisory for corporate, investor, and real-estate clients needing structured sustainability disclosures.
• Overheating Risk & Thermal Comfort Analysis CIBSE TM52 and TM59 overheating assessments, BB101 analyses for schools, and Part O compliance modelling for residential projects, delivered to design teams, developers, and education-sector clients.
• Accredited Carbon Literacy Training Accredited Carbon Literacy training courses certified by the Carbon Literacy Project, delivered to organisations, schools, and individuals seeking verified carbon literacy credentials.
• Bespoke CPD Training Sessions Bespoke Continuing Professional Development (CPD) sessions on sustainability topics tailored to client teams and delivered by the consultancy's qualified staff.

Quantifiable outcome

• 36 projects achieved BREEAM Excellent standard or higher
• +5 more outcomes

Named customers9 records

Segments6 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

One partnership is on record.

• bigmooseminorOthersCardiff-based charity focused on mental health, homelessness, and suicide prevention. RedSix is a long-standing supporter providing volunteering time, fundraising through events, and promoting awareness. Partnership includes team activities like running challenges (250km in September) and quiz nights.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Hilson Moran: UK environmental design and building performance consultancy providing BREEAM, WELL, energy modelling, and Net Zero strategy for commercial and residential developments. Direct peer in the built-environment sustainability space with overlapping accreditations and customer base.
• Hoare Lea: UK-based building services and environmental engineering consultancy with a dedicated sustainability team delivering BREEAM, Net Zero, and embodied carbon advisory across commercial, residential, and education sectors. Most directly comparable mid-sized UK firm competing for similar built-environment sustainability mandates.
• Elementa Consulting: UK building sustainability consultancy specialising in BREEAM, energy strategy, and operational carbon for new build and refurbishment projects. Closely comparable in service mix, accreditations, and target customer segments (developers, architects, contractors).
• Turley: UK planning and development consultancy with a dedicated sustainability team delivering BREEAM, energy statements, and Net Zero strategies for developers and public-sector clients. Closely comparable on planning-stage sustainability services and UK geographic focus.
• Useful Projects (Useful Simple Trust): UK sustainability and built-environment consultancy delivering BREEAM, embodied carbon, and net zero advisory across public and private sector projects. Comparable in size, ethos (employee-owned/B Corp-aligned), and service portfolio for UK building projects.

Broad incumbents

• AECOM: Global infrastructure consultancy with significant UK building sustainability and ESG advisory capabilities. Competes for major enterprise and public-sector BREEAM/NZC mandates and has the multi-disciplinary scale to bundle sustainability with broader project delivery.
• Arcadis: Global design and consultancy firm with sustainability, climate, and ESG advisory practices supporting UK real estate and infrastructure clients. Relevant peer for enterprise-level decarbonisation, ESG reporting, and Net Zero strategy mandates.
• WSP: Global professional services firm with a large UK sustainability and building performance practice covering BREEAM, LCA, ESG, and decarbonisation. Competes for larger enterprise mandates and represents the scaled-incumbent threat to small specialist consultancies.
• Stantec: Global engineering and environmental consultancy (including the acquired Hydrock UK business) offering BREEAM, energy, and sustainability advisory for UK buildings and infrastructure. Broader incumbent competing for similar enterprise and public-sector mandates with deeper geographic and technical resources.
• Buro Happold: Global engineering consultancy with a substantial built-environment sustainability practice spanning BREEAM, NZC, LCA, and ESG advisory. Larger, multi-disciplinary incumbent competing for the same enterprise and developer mandates as RedSix, but with significantly broader service breadth.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/redsixp

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about REDSIX PARTNERSHIP LTD