This site provides informative articles and actionable guides to share our knowledge on achieving energy and water independence, including the use of natural insulation to drive down energy costs. Ultimately, our goal is to help you create a low-maintenance, cost-effective home.

ECS is an energy and natural insulation consultancy—our advice comes from real-world experience, not sales pitches. We only recommend systems we actively install and trust, such as Victron, Steico, Diasen, and hemp.

To keep our skills sharp, we sometimes take on small land and building restoration projects between running our own living show house here in Western Asturias, where we put our experience into practice and test new ideas and products.

In 2025, the business split into two distinct entities; BioReforma S.L. has taken over management of restorations and natural spray insulation in the south, and ECS focuses on consulting and distribution.

ECS Insulation Calculator — Spain CTE 2026
ECS · Eco Construction Spain

Natural Insulation Calculator

Find the right breathable insulation for your project — sized to Spain's 2026 CTE building standards.

Spain CTE 2026 Compliant
Where is your project?
We'll determine your CTE climate zone and required U-value targets automatically.
What are you insulating?
Select the wall or structure type. This determines which CTE U-value limit applies.
Choose your insulation
ECS stocks natural, vapour-permeable materials from Steico, von Hanf, Rockwool and Diasen.
Add a finish or substrate layer (optional)
A cork render, clay plaster or lime coat adds thermal mass and controls moisture. Recommended for historic buildings.
Your Insulation Performance

Wall Assembly

Climate Zone Detail

Ready to specify your materials?

ECS ships natural insulation nationwide from Barcelona and Asturias. Get a quote or ask a question.

This tool is for estimation purposes only. Calculations are based on generic material properties and steady-state physics. It does not account for thermal bridges, mortar joints, or site-specific conditions. Compliance with the Spanish Technical Building Code (CTE) requires a certified project by a licensed Architect.

Articles

Land Clearing & Site Preparation in Western Asturias | ECS

Just bought a property in Western Asturias? ECS provides professional land clearing, flail mowing, and excavation for historic properties to help you start your renovation.

Heating in Spain

Heating in Spain

Understanding Carbon Fleece Heating and Phase-Change Hot Water

Understanding Carbon Fleece Heating and Phase-Change Hot Water

The Ultimate Eco-Envelope: Sprayed Hemp, Cork Upgrades, and Clay Finishes

The Ultimate Eco-Envelope: Sprayed Hemp, Cork Upgrades, and Clay Finishes

The Breathable Building Revolution: Why Steico, Diathonite, and Hemp are Winning

The Breathable Building Revolution

The “Lazy Architect” Trap

The “Lazy Architect” Trap

From Charming Ruins to Energy Fails: Why Spain’s Old Houses Are Becoming Unsellable Bricks

From Charming Ruins to Energy Fails: Why Spain’s Old Houses Are Becoming Unsellable Bricks

Steico Insulation

Natural Insulation

Radon Gas

Radon

Smart Home Batteries: Saving Money Without Solar Panels | ECS

Cannot install solar panels? Discover how to drastically cut your Spanish electricity bills using a smart grid-tied battery and daily energy arbitrage.

E-Waste Guarantee of Professional Tools

Why do Makita and Bosch tools fail in a year while Festool lasts 20? Read why ECS abandoned the 1-year e-waste guarantee for Festool’s sustainable quality.

The Real Cost of Building Right: Old Stone vs Modern Codes

The Real Cost of Building Right: Old Stone vs Modern Codes

The Reality of Off-Grid Living: Costs & Setup | ECS

The Reality of Off-Grid Living: Costs & Setup | ECS

Historic Roof Restorations: Natural Slate & Steico | ECS

ECS restores historic roofs in Spain using natural slate and breathable Steico wood fibre. Preserve exposed timbers and eliminate damp permanently.

Eucalyptus in Spain

Replacing eucalyptus, yield stacking, native forests Spain, silvopasture, ecological restoration, green desert.

Natural Insulated Lime & Hemp Renders | ECS

With 30 years of experience, ECS provides premium breathable natural renders. Discover our polished Diasen cork finishes and new proprietary hemp blends.

Restoring an Asturian ruin

Asturian urban law, building amnesty Asturias, off-grid restoration Spain, rural grants Spain, PREE 5000 Asturias, traditional stone restoration.

EU Solar Inverter Ban: Will Your Energy Bills Increase?

Chinese solar inverters Europe, solar energy cybersecurity, will solar inverter ban increase energy bills, European solar manufacturers

What is a VPP? Virtual Power Plants & BESS Explained

BESS with a Virtual Power Plant (VPP) fixes broken solar dumping, unlocks peak trading arbitrage, and stabilises the modern grid.

Why is Spain Still Using Non-Breathable Insulation?

Why Spanish architects still favour synthetic foam over breathable insulation. Learn about damp, CTE regulations, and the shift to sustainable building in Spain.

Under the Skin: An Exclusive Look at Our Historic Retrofit

Under the Skin: An Exclusive Look at Our Historic Retrofit

The “Free” Insulation Trap: Why Modern Grants Can Ruin Historic Spanish Homes

The “Free” Insulation Trap

From Damp Walls to Dry Homes: Unmasking the True Causes of Damp

From Damp Walls to Dry Homes: Unmasking the True Causes of Damp

The “Lazy Architect” Trap

The “Lazy Architect” Trap

Steico Insulation

Natural Insulation

How to build a Steico & Huum sauna

Master the art of the “breathable” sauna. Learn how to integrate Steico Flex and Duo Dry panels with HUUM heaters for a high-thermal-mass, eco-friendly sauna build.

The Real Cost of Restoring a Mountain Ruin

Buying a pile of stones? Don’t underestimate the budget. ECS breaks down the real costs of mountain ruin restoration, from structural shells at 800€/m² to full finishes.

Insulation Regulations Delay Property Sales and Drive High Demand for Installers

Insulation Regulations Delay Property Sales and Drive High Demand for Installers

Step-by-step guide: How to make a Diathonite kitchen countertop

Learn how to create a stunning concrete kitchen countertop with this comprehensive step-by-step guide.

Effective traditional methods employed in preventing rising damp

Effective traditional methods employed in preventing rising damp

Heating in Spain

Heating in Spain

The Main Factors Behind Rising Damp: Unveiling the Culprits

Discover the hidden causes of rising damp with this insightful article.

Diasen: Natural Plasters Explained

Discover the beauty and benefits of Diasen natural plasters in this comprehensive guide.