What LEAN GREEN CONSULTING LTD. does

Lean Green Consulting Ltd. is a privately-held, Scotland-incorporated building-energy consultancy (company number 538584) founded in 2016 and operated as a sole proprietorship by Es Tresidder from Fort William in the west Highlands. The firm delivers specialised consulting services to architects, design teams, and property owners across Scotland, the UK and Europe, with coaching/training services offered to building professionals worldwide. Its core offerings include Passivhaus design and consultancy, low-energy retrofit design, thermal bridging analysis using THERM, dynamic overheating analysis, and multi-objective building design optimisation. A secondary coaching service line prepares candidates for the Passivhaus designer/consultant exam and delivers DesignBuilder dynamic simulation training.

The underlying technology stack centres on DesignBuilder for dynamic building energy simulation, THERM for thermal bridge calculations, and evolutionary algorithms (genetic algorithms) developed through Es Tresidder's PhD and MSc research for multi-objective optimisation across cost, energy performance, comfort, and summer overheating risk. The firm's competitive position rests on the individual credentials of its founder, who holds both the Passivhaus Institute's certified Passivhaus designer credential and the AECB Carbonlite Retrofit Designer accreditation, combined with academic rigour in computational optimisation of low-energy building designs.

The business model is a professional services consultancy with two revenue streams: (1) time-based consultancy engagements sold directly via website contact, email, and phone, with pricing not publicly disclosed; and (2) coaching/training delivered both face-to-face and online worldwide. The go-to-market is sales-led and direct, targeting architects and design teams as the primary customer segment, with property owners (residential and commercial) as a secondary use-case segment. Marketing is content-driven through a blog, Twitter, and LinkedIn. The firm operates with no external investment, no institutional funding, no disclosed partnerships, and no patents or trademarks.

Name

LEAN GREEN CONSULTING LTD.

Legal name

Lean Green Consulting Ltd.

Website

https://leangreenconsulting.co.uk

Company type

Private

Founded year

2016

Operating status

Operating

Headcount range

1–10 employees

Short description

Lean Green Consulting Ltd. is a Scotland-based, sole-practitioner building-energy consultancy delivering Passivhaus design, low-energy retrofit, thermal bridging analysis, overheating analysis, and building design optimisation services to architects, design teams, and property owners across the UK and Europe, with worldwide coaching in DesignBuilder simulation and Passivhaus certification.

Ownership category

akta.pro rank

Product category

Building Energy Consulting

NAICS

Other Scientific and Technical Consulting Services (54169), Environmental Consulting Services (54162)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Sustainable/Green Building & LEED Consulting (BPAHAKAG)

akta.pro secondary industries

Energy Systems & Power Engineering Consulting (BPAHAIAG), Green Building & Energy-Efficient Construction (LEED, Weatherization) (EDAOAAAO)

Keywords

• Passivhaus design
• Building energy modelling
• Low-energy retrofit
• Thermal bridging analysis
• Overheating analysis

Headquarters

HQ city

Fort William

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

Revenue model

1. Consultancy Services: Passivhaus design and consultancy, low-energy retrofit design, thermal bridging analysis, overheating analysis, and building design optimisation services for architects and design teams.
2. Coaching Services: Coaching for designers preparing for Passivhaus designer/consultant exam and in dynamic building-energy simulation using DesignBuilder. Both face-to-face and online training worldwide.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Lean Green Consulting is a building-energy consultancy offering Passivhaus design and consultancy, low-energy retrofit design, thermal bridging analysis, dynamic overheating analysis, and multi-objective building design optimisation using evolutionary algorithms. The firm also provides coaching for Passivhaus certification exam preparation and DesignBuilder dynamic building-energy simulation training. Services are delivered directly by the founder to architects, design teams, and property owners in the UK and internationally.

Product overview

Lean Green Consulting is a building-energy consultancy offering a portfolio of specialized services centered on low-energy and Passivhaus building design. The core offerings include Passivhaus design and consultancy, low-energy retrofit design, thermal bridging analysis, overheating analysis, and building design optimisation using evolutionary algorithms. These services are complemented by coaching in building-energy modelling for Passivhaus certification and DesignBuilder simulation. The company operates as a consultancy firm rather than a software product, delivering expertise through direct client engagements and training programs.

Differentiator

Problem solved

Functional benefit

Products and services

• Passivhaus design and consultancy Certified Passivhaus designer services supporting architects and design teams from early design-stage feasibility checks through full project support to Passivhaus certification, ensuring designs meet rigorous Passivhaus standards.
• Low-energy retrofit design and consultancy AECB-accredited retrofit design consultancy for existing residential and commercial buildings, focused on moisture-robust, reliable energy performance retrofits that reduce energy bills and improve comfort and indoor air quality.
• Thermal bridging analysis Thermal bridge assessment using THERM software to evaluate and minimise thermal bridges in building designs for compliance with UK building regulations and Passivhaus requirements.
• Overheating analysis Dynamic overheating analysis for new-build and retrofit projects using simulation tools and future climate scenarios to mitigate summer overheating risk and ensure year-round performance.
• Building design optimisation Multi-objective building design optimisation using evolutionary algorithms, applicable to new-build and retrofit projects and optimised across cost, energy performance, comfort, and summer overheating risk.
• Coaching in building-energy modelling Coaching for designers preparing for the Passivhaus designer/consultant exam and in dynamic building-energy simulation using DesignBuilder, delivered face-to-face and online worldwide.

Quantifiable outcome

• Well-designed low-energy buildings can reduce energy use by up to 90%

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Scale indicators1 record

Recent moves6 records

Expansion highlights5 records

Direct peers

• Enhabit: UK sustainable building consultancy offering Passivhaus design support, retrofit advice, and building performance services for residential and commercial projects.
• WARM (Low Energy Building Practice): UK consultancy specialising in low-energy and Passivhaus building design, retrofit, and energy modelling — competing for the same architect and homeowner client base.
• Peter Warm Ltd: UK consultancy offering Passivhaus and low-energy building design services with a comparable focus on certified design and energy modelling for architects.
• Elementa Consulting: UK Passivhaus and low-energy building consultancy providing Passivhaus design, retrofit, and building performance services to architects and developers — directly comparable in service mix and target clients.
• GreenGauge Energy: UK building energy consultancy providing Passivhaus design, thermal bridging analysis, and overheating assessments — overlapping service portfolio and customer segments.
• Etude Ltd: UK consultancy offering Passivhaus design, low-energy retrofit, and building performance analysis services for architects and self-build clients.

Broad incumbents

• Hoare Lea: Large UK engineering firm offering building performance, sustainability, and low-energy design services including Passivhaus expertise within a wider portfolio.
• Cundall: International engineering consultancy with a dedicated sustainability team providing building energy modelling, Passivhaus support, and low-carbon design services.
• Max Fordham LLP: Major UK engineering consultancy with a sustainability and building performance practice; offers Passivhaus-adjacent services as part of a broader MEP and sustainability portfolio.

Others

• Passivhaus Trust: UK industry body promoting Passivhaus standards — adjacent rather than competing, but the central certification body whose standards Lean Green's services are designed around.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights5 records

Customer concentration

• Xtwitter.com/EsTresidder
• LinkedInlinkedin.com/company/lean-green-consulting-ltd.

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 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 LEAN GREEN CONSULTING LTD.