Warm

Name

Warm

Legal name

WARM

Website

https://peterwarm.co.uk

Company type

Private

Founded year

2009

Operating status

Operating

Headcount range

1–10 employees

Ownership category

akta.pro rank

Product category

Passivhaus and Low-Energy Building Consultancy

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

Electrical Work (1731)

akta.pro primary industry

Chillers, Boilers & Central Plant Operations (BPABACAG)

akta.pro secondary industries

Exterior Insulation & Weatherproofing (House Wrap, Air/Water Barriers) (HSAPAKAK), Duct Sealing, Insulation & Airflow Balancing (HSAOAIAH), Building Envelope & Weatherproofing (Roofing/Waterproofing/Gutters) (IMAIABAG)

Keywords

• Passivhaus consultancy
• Low energy buildings
• Building certification
• Thermal bridge modelling
• Airtightness testing

Headquarters

HQ city

Plymouth

HQ country

United Kingdom

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Passivhaus Certification Services: Independent Passivhaus and low-energy building certification providing confidence that buildings meet agreed standards and perform as intended, from design through to completion. WARM was among the first Passivhaus certifiers in the UK.
2. Design and Consultancy: Independent, practical support to help low-energy projects make confident decisions from early project briefs through to detailed design and on-site technical input. Services include Passivhaus consultancy, whole life carbon, airtightness testing, thermal bridge modelling, building services optimization.
3. Testing and Monitoring: Building testing and performance monitoring grounded in real-world experience including airtightness testing, coheating tests, energy use analysis, and comfort analysis. Helps identify issues early and validate design assumptions.
4. Training Services (via Coaction): Practical training and knowledge-sharing through sister company Coaction Training CIC, established in 2009. Courses include Passivhaus Bitesize, Certified Passivhaus Designer, Certified Passivhaus Tradesperson, Passivhaus in Practice, Retrofit Delivery, and Introduction to THERM.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels6 records

Core offering

WARM is an independent, family-run Passivhaus and low-energy building consultancy providing four core services: Design and Consultancy (Passivhaus design support, thermal bridge modelling, airtightness design, whole life carbon and retrofit), independent Building Certification (Passivhaus Classic, Passivhaus Plus, EnerPHit, AECB CarbonLite), Training (via sister company Coaction Training CIC), and Testing and Monitoring (airtightness testing, coheating tests, energy use and comfort analysis). It serves contractors, end clients, project managers, architects, and consultants across the UK low-energy building sector from early design through delivery and use.

Product overview

WARM is an independent, family-run low-energy building consultancy providing four core service offerings: Design and Consultancy (covering Passivhaus design, whole life carbon, airtightness, thermal bridging, and retrofit), Building Certification (independent Passivhaus certification), Training (delivered through sister company Coaction including Certified Passivhaus Designer and Tradesperson courses), and Testing and Monitoring (building performance testing, coheating tests, and post-occupancy evaluation). WARM supports clients, designers, contractors, and the supply chain to deliver high-performance buildings.

Differentiator

Problem solved

Functional benefit

Products and services

• Design and Consultancy Independent, practical consultancy support helping low-energy projects make confident decisions from early project briefs through detailed design and on-site technical input. Covers Passivhaus consultancy, whole life carbon, zero carbon building standards, airtightness design, thermal bridge modelling, building services optimisation, and retrofit solutions for contractors, end clients, architects and consultants.
• Building Certification Independent Passivhaus and low-energy building certification providing confidence that buildings meet agreed standards and perform as intended, from design through completion. WARM certifies against Passivhaus Classic, Passivhaus Plus, EnerPHit, and AECB CarbonLite standards for individual dwellings, multi-residential, education, leisure, and commercial schemes.
• Training (Coaction Training CIC) Practical training and knowledge-sharing delivered through sister company Coaction Training CIC to help designers, contractors, and clients build confidence in low-energy design and delivery. Courses include Passivhaus Bitesize, Certified Passivhaus Designer, Certified Passivhaus Tradesperson, Passivhaus in Practice, Retrofit Delivery, and Introduction to THERM, all endorsed by the Passivhaus Trust.
• Testing and Monitoring Building performance testing and monitoring grounded in real-world experience to help teams understand how buildings actually perform rather than just how they were designed. Includes airtightness testing, coheating tests, energy use analysis, and comfort analysis to validate design assumptions and identify issues early.

Quantifiable outcome

• St Sidwell's Point achieved airtightness of 0.3 m³/hr/m² @ 50 Pa, exceeding Passivhaus requirement of 0.4 m³/hr/m²
• +3 more outcomes

Named customers20 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Two partnerships are on record, tiered core.

• Coaction Training CICcoreStrategic or Co-development Partner · 1 January 2009Coaction Training CIC is WARM's sister company established in 2009 to support the construction industry with practical, experience-led training in low-energy building. WARM's team members serve as trainers for Coaction courses including Certified Passivhaus Designer, Certified Passivhaus Tradesperson, and other courses.
• Passivhaus TrustcoreStrategic or Co-development PartnerCoaction's training courses are endorsed by the Passivhaus Trust. WARM director Sally Godber co-authored industry guides for the Trust including Air to Water Heat Pumps, Steel in Passivhaus Construction, and How to Build a Passivhaus.

Scale indicators10 records

Recent moves6 records

Expansion highlights6 records

Broad incumbents

• Hydrock (now part of Stantec): UK engineering and sustainability consultancy with building performance and low-energy design services. Overlaps with WARM on public-sector and education Passivhaus work.
• Max Fordham: Established UK building services engineering consultancy with a growing Passivhaus and low-energy practice. Competes with WARM on larger schemes (and is itself a WARM client) but operates across a broader MEP portfolio.
• Cundall: Global multi-disciplinary engineering and sustainability consultancy with active Passivhaus and net-zero capability. Competes on larger commercial and education projects where WARM also bids.
• Buro Happold: Large international engineering consultancy with sustainability, building performance, and low-energy design teams. Increasingly competes with WARM on complex public-sector Passivhaus commissions.

Direct peers

• Etude (formerly ECD Architects): Architectural and Passivhaus consultancy with deep retrofit and new-build expertise, providing certification, PHPP modelling, and design services in the UK. Direct competitor on Passivhaus certification commissions.
• Sustainable BY Design: Specialist low-energy and Passivhaus consultancy offering design, certification, PHPP modelling, and airtightness services across UK residential and education sectors. Closely comparable niche positioning to WARM.
• Elementa Consulting: UK MEP and sustainability consultancy with a strong Passivhaus and low-energy building practice. Directly comparable to WARM in delivering Passivhaus certification, PHPP modelling, and design support for residential, education, and public-sector projects.

Regional players

• John Gilbert Architects: Scottish architecture and Passivhaus consultancy focused on social housing and retrofit. Geographic overlap (Scotland) and similar public-sector client base to WARM, though with a more architecture-led offering.

Others

• AECB (Association for Environment Conscious Building): UK membership body promoting sustainable building, including the AECB CarbonLite standard that WARM helps certify. Not a direct competitor, but the standards body whose work underpins WARM's certification revenue.
• Passivhaus Trust: UK non-profit that promotes Passivhaus standards and endorses Coaction's training courses. Functions as an ecosystem partner (training endorsement, technical guidance) rather than a commercial competitor.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/warm_lowenergy
• Xx.com/peterwarm
• LinkedInlinkedin.com/company/warm-low-energy-building-practice

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles13 records

Subsidiaries1 record

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 Warm