21 Degrees

What 21 Degrees does

21 Degrees is a UK-based sustainable building products and services company that supplies high-performance fenestration, mechanical ventilation with heat recovery (MVHR), heat pumps, solar panels and solar batteries, together with airtightness membranes, Compacfoam insulation and specialist accessories, to homeowners, commercial clients, architects/specifiers and local authorities across England. The company operates a trading identity of GoEco Renewables Limited within the Efficient Building Solutions group, which also encompasses Environmental Construction Products Ltd and five operating sister brands (JEM Energy, JL Phillips, H.Eco, Doré Woodman, Solar Voltaics).

Technically, the company differentiates on building-fabric performance: its triple-glazed timber windows and doors use dual compression seals achieving BS EN 12207 Class 4 airtightness (the highest grade), with products used in the UK's most airtight home (0.041 air permeability @ 50 pascals). MVHR units recover up to 95% of heat from outgoing air, with the Focus 200 unit drawing approximately 22 watts (≈10p per day to run). The firm also delivers Passivhaus consultancy, MVHR design and whole-building low-energy design services through its 21° by Design offering.

Commercially, 21 Degrees runs a hybrid revenue model: one-time product sales (including a direct e-commerce shop), professional installation services delivered by an in-house FENSA-registered team operating nationwide, design/consultancy fees, and FCA-regulated finance brokering via Shermin Finance (8.9% APR Representative). Distribution combines three physical showrooms (Huddersfield, Swindon at the National Self Build and Renovation Centre, and Poole), a nationwide installation team, regional sales phone lines, and digital marketing via a Knowledge Hub. The company holds an unusually dense certification stack including MCS, FENSA (Company ID 23703), TrustMark, Secured by Design, PAS24:2022, Part Q, Gas Safe, REFCOM F-Gas, FSC timber and the Queen's Awards for Enterprise: Sustainable Development (2009). It was originally founded in 1995 as Environmental Construction Products, became Eco East Anglia, then Green Building Renewables in 2023, and rebranded to 21 Degrees in November 2024.

Name

21 Degrees

Legal name

GoEco Renewables Limited

Website

https://eco-energyuk.co.uk

Company type

Private

Founded year

2007

Operating status

Operating

Headcount range

1–10 employees

Short description

21 Degrees is a UK sustainable building supplier (operating as GoEco Renewables within the Efficient Building Solutions group) that designs, supplies and installs high-performance windows, doors, MVHR systems, heat pumps and solar products for homeowners, commercial clients, architects and councils across England.

Ownership category

akta.pro rank

Product category

Energy-Efficient Building Solutions

NAICS

Plumbing, Heating, and Air-Conditioning Contractors (238220), Plumbing, Heating, and Air-Conditioning Contractors (23822), Drywall and Insulation Contractors (23831)

SIC

Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585), Industrial & Commercial Fans & Blowers & Air Purifing Equip (3564), Heating Equipment, Except Electric & Warm Air Furnaces (3433)

akta.pro primary industry

Residential HVAC System Installation (Furnace/AC/Heat Pump) (HSAOAGAA)

akta.pro secondary industries

Energy Storage Components for Renewables Manufacturing (BESS Packs, PCS, Thermal Management) (EUAMAHAI), Ventilation, Ducting & Air Distribution Equipment (IMAHAKAG), Attic Insulation, Air Sealing & Ventilation Upgrades (HSAPACAI), Commercial HVAC/R Installation (Rooftop Units, Split Systems) (HSAOAGAH)

Keywords

• Renewable energy systems
• Low-energy building products
• Passivhaus consultancy
• Triple-glazed timber windows
• Mechanical ventilation heat recovery

Headquarters

HQ city

London

HQ country

United Kingdom

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Product Sales: Sale of triple-glazed timber windows, doors, MVHR units, heat pumps, solar panels, Compacfoam insulation, airtightness products and accessories through e-commerce shop (odoo.21degrees.com)
2. Installation Services: In-house FENSA registered installation team providing window, door, and system installation throughout the UK. Supply-only service also available for customers with own installers.
3. Design Services: MVHR design service, Passivhaus consultancy, low energy design service, and 21° by Design supporting self-builders and architects from concept to completion
4. Training & CPD: Specialist design and construction training for building professionals, CPD sessions on Passivhaus, high performance windows & doors, and MVHR
5. Finance Brokering: FCA registered credit broking through Shermin Finance (FCA registration 1003260). Offers credit products from panel of lenders at 8.9% APR Representative.

Pricing tiers

Go-to-market motion2 records

Distribution channels5 records

Marketing channels6 records

Core offering

21 Degrees supplies and installs renewable energy systems (solar panels, solar batteries, air source and ground source heat pumps) and high-performance building fabric products (triple-glazed timber windows, high-performance doors, MVHR ventilation systems, airtightness membranes, Compacfoam insulation) for UK residential and commercial buildings. The company complements its product portfolio with specialist design services (Passivhaus consultancy, MVHR design, low-energy whole-building design), a nationwide in-house FENSA-registered installation team, and CPD training for building professionals.

Product overview

21 Degrees is a sustainable energy and building fabric company offering energy-efficient products and services for residential and commercial buildings. The company provides a portfolio of high-performance products including triple-glazed timber windows, high-performance doors, MVHR ventilation systems, solar panels, solar batteries, and heat pumps (air and ground source). These core products are complemented by specialist airtightness products, Compacfoam insulation, and consumable accessories like MVHR filters and loft hatches. The company also offers design services including Passivhaus consultancy, MVHR design service, and low-energy design service. Originally founded as Eco East Anglia, rebranded to Green Building Renewables in 2023, and became 21 Degrees in November 2024. The company operates as part of the Efficient Building Solutions group.

Differentiator

Problem solved

Functional benefit

Products and services

• Triple-Glazed Timber Windows

Quantifiable outcome

• Up to 95% heat recovery from outgoing air in MVHR systems
• +4 more outcomes

Named customers4 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Nine partnerships are on record, tiered core.

• JEM EnergycoreOthersPart of the 21 Degrees family and Efficient Building Solutions group. Solar and renewable energy installation partner.
• J L PhillipscoreOthersPart of the 21 Degrees family and Efficient Building Solutions group.
• H.EcocoreOthersPart of the 21 Degrees family and Efficient Building Solutions group.
• Doré WoodmancoreOthersPart of the 21 Degrees family and Efficient Building Solutions group.
• Solar VoltaicscoreOthersPart of the 21 Degrees family and Efficient Building Solutions group.
• Efficient Building SolutionscoreOthersParent group of Environmental Construction Products Ltd (Company Number 3359943) and GoEco Renewables Ltd (Company Number 10062009). Owns the 21 Degrees trading brand.
• TrustMarkcoreStrategic or Co-development PartnerUK Government-endorsed quality scheme for trades. 21 Degrees operates in accordance with TrustMark requirements for customer service, workmanship, and complaints handling.
• Microgeneration Certification Scheme (MCS)coreStrategic or Co-development PartnerQuality assurance scheme for renewable energy installations. 21 Degrees certified for heat pump and solar installations.
• Renewable Energy Consumer Code (RECC)coreStrategic or Co-development PartnerConsumer protection scheme governing sales and marketing practices in renewable energy sector. 21 Degrees compliant with RECC requirements.

Scale indicators5 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Green Building Store: UK Passivhaus-focused supplier of high-performance windows, MVHR, insulation and airtightness products. Predecessor entity to parts of the 21 Degrees group (Environmental Construction Products/Green Building Store lineage) and the most direct functional peer for sustainable building product distribution.
• Ecological Building Systems: UK and Ireland distributor of natural and low-impact building materials, airtightness membranes, and insulation systems for Passivhaus and low-energy construction. Directly comparable product mix (Pro Clima membranes, specialist insulation) and overlapping architect/specifier customer base.
• Beattie Passive: UK Passivhaus design-and-build specialist offering consultancy, training, and certified Passivhaus construction. Comparable in targeting architects and self-builders with high-performance building expertise, though more construction-led than product-led.
• Kensa Heat Pumps: UK manufacturer and installer of ground source and air source heat pumps, plus heat network infrastructure. Directly comparable in supplying and installing heat pumps for residential low-carbon projects, with overlapping MCS-certified installer profile.

Broad incumbents

• NIBE Energy Systems: Swedish manufacturer of heat pumps, MVHR, and HVAC systems sold through UK installer networks. Overlaps with 21 Degrees' heat pump and MVHR categories at the product level but operates as a manufacturer/equipment supplier rather than design-to-install integrator.
• Vaillant UK: Major UK boiler and heat pump manufacturer selling through installer networks. Comparable as a heat pump equipment supplier to UK consumers but competes only at the product tier, not at the integrated Passivhaus consultancy or fabric offering.
• Worcester Bosch: Established UK boiler and now heat pump manufacturer with broad installer network. Overlaps with 21 Degrees in heat pump supply and residential heating installation but lacks the Passivhaus design and MVHR specialism.
• Internorm: European high-performance triple-glazed window and door manufacturer with UK distribution. Direct competitor at the high-performance timber window tier 21 Degrees supplies, though operates as a manufacturer rather than design-to-install service provider.

Emerging players

• Octopus Energy Services: UK energy retailer's in-house heat pump, solar, and EV charger installation arm scaling rapidly with significant venture-backed marketing. Emerging direct competitor in residential renewable installations but lacks Passivhaus design and airtightness specialism.
• Boxt: Digital-first UK boiler and heat pump installer with strong consumer marketing and finance offerings. Emerging competitor in the residential heat pump segment that 21 Degrees also targets, though without Passivhaus or building-fabric positioning.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@weare_21degrees/videos
• Xx.com/weare_21degrees
• Facebookfacebook.com/wearetwentyonedegrees
• LinkedInlinkedin.com/company/weare21degrees

Compliance12 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries5 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 21 Degrees