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Perfect Conditions, Every Single Day
Elite performance environments with total climate control and A-rated energy efficiency
From £150,000
When excellence is non-negotiable and conditions must be perfect year-round, DUOL permanent air domes deliver the world's most advanced covering technology. Trusted by Premier League academies and David Lloyd Leisure.
The Premium Choice for Serious Facilities
Choose permanent air domes when consistent, professional-grade conditions are essential for your operation. Perfect for facilities where member experience, energy efficiency, and year-round availability drive success.
Ideal for
David Lloyd Leisure and premium operators
Premier League football academies
Elite tennis and performance centres
Universities with professional programmes
Active leisure operators
You should choose permanent if you:
Require 365-day availability without compromise
Need total climate and environmental control
Have sustainability and energy efficiency targets
Want premium member/player experience
Seek 20-30 year asset lifespan
Why Elite Facilities Choose Permanent
A-Rated Energy Efficiency
ECO Ultra achieves 0.65 W/m²K U-value—the industry's best thermal performance, reducing heating costs by 50-70%.
Total Climate Control
Maintain 18-22°C year-round regardless of external conditions, from -30°C to +45°C.
Double-Skin Technology
Exclusive DUOL partnership brings patented ECO membrane system—no thermal bridges, no condensation, no compromise.
Smart Building Systems
IoT-enabled monitoring with predictive maintenance, remote management, and real-time performance data.
Architectural Excellence
Wrinkle-free design with hidden cables creates premium aesthetics worthy of flagship facilities.
10-Year Warranty
Industry-leading membrane guarantee demonstrates DUOL's confidence in their technology.
Professional Lighting
Integrated LED systems deliver up to 1000 lux for broadcasting standard illumination.
Superior Acoustics
45dB sound reduction creates peaceful training environments even in urban locations.
Tailored to Your Facility
Insulated Membrane System
ECO Ultra
Two PVC layers with air gap insulation
U-value of 0.65 W/m²K (ECO Ultra)
Eliminates condensation issues
10-year manufacturer warranty
HVAC Integration
Total environmental control
Maintain 18–22°C year-round
Heat recovery ventilation options
Smart controls for efficiency
Proven from -40°C to +50°C
LED Lighting System
Broadcast-quality illumination
200–500 lux for training
Up to 1,000 lux for competition/TV
Integrated into membrane design
Low energy consumption
Complete Facility Integration
More than just a dome
Changing rooms and amenities
Spectator seating options
Equipment storage
Seamless connection to existing buildings
Engineered for Excellence: Membrane Technology
ECO Basic - The Foundation Solution
Double-membrane with air pocket insulation
15–20% energy savings vs single-skin
Natural light transmission
Proven across hundreds of installations
Upgrade path to ECO Advance available
ECO Advance - The Smart Investment
U-value: 2.8 W/m²K
Upgradeable to A-rated insulation
Wrinkle-free design
Hidden cable system
30–40% energy savings
Architectural Options
Panoramic windows (up to 20m²)
Elevated sidewalls (up to 6m)
Custom geometries for challenging sites
Full colour customisation
Climate Control Systems
Gas-fired heating (300-1,500kW)
Air source heat pumps (COP 3.5-4.0)
Ground source heat pumps (COP 4.0-5.0)
Heat recovery ventilation (80% efficiency)
Technical Overview
Structural Performance
Wind rated to 180mph (290km/h)
Snow loading: 1.5kN/m²
Seismic resistance to regional codes
Operating pressure: 300-500 Pa
Triple safety factors
Installation
Timeline: 16-24 weeks total
Groundworks: 6-8 weeks
Manufacturing: 8-10 weeks
Assembly: 7-10 days
Commissioning: 3-5 days
Operational Requirements
Power: 3-phase, 100-400A
Energy use: 150-300kWh/m²/year
Maintenance: Annual inspection
Lifespan: 20-25 years membrane
Environmental Credentials
A-rated energy performance available
Supports net-zero targets
60% carbon reduction vs traditional
BREEAM excellent achievable
Covered Facilities Already Winning
The Grange Club, Edinburgh
We now run around 80% of our winter programme indoors. That's a massive change, and it's felt at every level of the club.
Rick Symington, Chair
Caesarean Lawn Tennis Club, Jersey
You get that wow from the kids and the parents the first time they step inside. I never get tired of hearing that amazement and seeing the look on their faces. For many, it's their first time playing indoors. The light, the scale, and the sound of the ball echoing around the space make it feel special.
Scott Sherborne, Head of Tennis
David Lloyd
Covair have supplied many domes to the David Lloyd group of leisure clubs over a number of years. There are currently 35 domes in operation around the UK, both seasonal and permanent. With this volume of sites involved it is crucial to have regular communication and a high level of support, which we have with Covair.
Julie Bingham, Capex Manager
Premium Facility Management
Comprehensive Care Total facility management for optimal performance
Bronze, Silver and Gold tiers
M&E inspection and certification
Guaranteed emergency response
Preventive maintenance included
Professional Cleaning Maintain appearance and extend lifespan
Specialist membrane cleaning
Restores light transmission
Enhances facility appearance
Extends membrane lifespan
Capital Investment Options Structured financing solutions
Leasing and hire purchase options
Seasonal payment structures
Quick approval process
Tailored to your cash flow
Your Premium Solution
Membrane Options
ECO Basic: Proven double-skin construction
ECO Advance: Upgradeable to A-rated efficiency
Installation and commissioning included
Groundworks additional
What Affects Price
Dome size and configuration
Technology level selected
Climate control specification
Architectural features
Site complexity
What Affects Price
Dome size and configuration
Technology level selected
Climate control specification
Architectural features
Site complexity
Typical ROI Timeline
3-4 years through energy savings alone
Member retention improvements
Premium pricing capability
Reduced maintenance costs
Enhanced facility reputation
Energy Savings Comparison:
50-70% savings vs single-skin domes
30-40% savings vs traditional buildings
Carbon reduction: 60% versus conventional
Membrane Technology (ECO Advance vs ECO Ultra)
THE SMART INVESTMENT
U-value: 2.8 W/m²K (upgradeable)
Future-proof with insulation upgrade path
30-40% energy savings vs single-skin
Identical elegant appearance to Ultra
From £150,000
THE PREMIUM STANDARD
U-value: 0.65 W/m²K (A-rated)
100mm premium insulation layer
60-70% energy savings vs single-skin
10-year manufacturer warranty
From £450,000
SMART BUILDING / ENERGY PERFORMANCE
Why Elite Facilities Choose Permanent
A-Rated Energy Efficiency
ECO Ultra achieves 0.65 W/m²K U-value—the industry's best thermal performance, reducing heating costs by 50-70%.
Total Climate Control
Maintain 18-22°C year-round regardless of external conditions.
Double-Skin Technology
Exclusive DUOL partnership brings patented ECO membrane system—no thermal bridges, no condensation, no compromise.
Smart Building Systems
IoT-enabled monitoring with predictive maintenance, remote management, and real-time performance data.
Architectural Excellence
Wrinkle-free design with hidden cables creates premium aesthetics worthy of flagship facilities.
10-Year Warranty
Industry-leading membrane guarantee demonstrates DUOL's confidence in their technology.
Professional Lighting
Integrated LED systems deliver up to 1000 lux for broadcasting standard illumination.
Superior Acoustics
45dB sound reduction creates peaceful training environments even in urban locations.
Frequently Asked Questions
What's the difference between ECO Basic and ECO Advance?
ECO Basic is a proven double-membrane system with air pocket insulation, ideal for facilities on a budget. ECO Advance features an elegant wrinkle-free design with hidden cables (2.8 W/m²K) and can be upgraded with insulation later without replacing the membrane.
How does the energy efficiency compare to traditional buildings?
ECO Advance achieves better thermal performance than most traditional sports buildings, with 30-40% lower energy consumption and significantly reduced carbon emissions. ECO Basic delivers 15-20% energy savings versus single-skin alternatives.
Can permanent domes withstand extreme weather?
Yes, they're certified to 180mph winds and have performed flawlessly from Siberian winters (-40°C) to Middle Eastern summers (+50°C).
What about condensation issues?
ECO Advance eliminates condensation through its advanced double-skin technology with no thermal bridges. ECO Basic manages condensation effectively through its air pocket design, with only minimal occurrence possible in extreme conditions.
How long does installation take?
Total project timeline is 16-24 weeks from order, with actual dome installation taking just 7-10 days. Most time is manufacturing and groundworks preparation.
What maintenance is required?
Annual professional inspection is essential, taking 2 days. The DomeCare™ Gold package includes all mechanical, electrical, and membrane maintenance.
Can the dome be relocated?
Yes, permanent domes can be dismantled and relocated if requirements change—a significant advantage over traditional construction.
