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Energy-efficient timber houses start with the right structure
Energy performance

Energy-efficient timber houses start with the right structure

ZTC adapts timber structures to project energy requirements, insulation, airtightness and assembly quality.

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ZTC experience and production facts

35+

years of experience

400+

completed projects

14

European countries

±1 mm

CNC precision

Technical energy performance indicators

ZTC timber structures can be designed for strong thermal performance, but the final result depends on the whole building — not wall thickness alone.

Wall U-value
Calculated for the project

The U-value depends on all wall layers, material properties and structural junctions. It is not determined by the Comfort, Premium or Lux name alone.

Airtightness
Tested for the completed building

The airtightness target is set in the design; the achieved result is verified by a building airtightness test.

Wall thickness
According to panel specification

Total external wall thickness comprises the frame, insulation, barriers and finishing layers.

What ZTC covers and what the project team reviews

  • ZTC provides the timber structure, insulation and membranes according to scope.
  • Windows, ventilation, heating and building form must be reviewed with architects and engineers.
  • A+ class depends on the whole building, not wall thickness alone.

An energy audit is usually carried out during the design stage to compare solutions before production and assembly.

What clients say about working with ZTC

Google reviews highlight structural quality and energy performance delivery.

Google review

We are Premium Living AS in Norway and built two houses with this company. We were very satisfied. We sold the last project 2 years ago when I write this review, and the first house was built 4 years ago. With both houses, the production, planning and timing all went smooth and well organised. Right now, all three buyers are pleased, and we haven't received a single complaint about flaws or even blemishes. Even during the Covid lockdowns there was no doubt that our investments and cooperation with ZTC were solid. We recommend, and anyone that has questions can ask ZTC for our reference.

Google review

ZTC built my house in 2012, and they have done some reclamation work in two periods since then. Only positive experiences with ZTC! Good quality of workmanship and customer support.

Google review

Ļoti profesionāls un ieinteresēts darbs no ZTC puses, lai maksimāli izpildītu klienta vēlmes mājas būvniecībā, ieguldot laiku visu detaļu precizēšanā, kā rezultātā pašas būvniecības laikā neko nevajadzēja koriģēt un ir tapusi patiesi kvalitatīva māja. Atzinīgus vārdus par mājas būvniecības kvalitāti saņēmām no visiem speciālistiem, ar kuriem sadarbojāmies vēlāk - liekot logus un durvis, jumta segumu un apdari. Paldies par paveikto un varam tikai ieteikt citiem izmantot ZTC pakalpojums māju būvniecībā! Pateicībā, Irēna un Janeks

View reviews on Google

ZTC technical reference points

U-value

The U-value depends on all wall layers, material properties and structural junctions. It is not determined by the Comfort, Premium or Lux name alone.

Airtightness

The airtightness target is set in the design; the achieved result is verified by a building airtightness test.

Precise production

CNC precision of ±1 mm helps reduce assembly error risk.

Factory production

Panels are prepared in controlled conditions in the ZTC factory in Latvia.

A+ class and energy audit

A+ energy performance depends on the whole building — structure, windows, ventilation, heating and form. ZTC provides the timber structure and panel solution, while the energy audit result is defined during design together with architects and engineers. This helps choose scope before production.

Related ZTC projects

Precision Meets Recognition: Building for an Architect

Private residence

Precision Meets Recognition: Building for an Architect

Gelderland, Netherlands

View project
Commitment & Trust – Building Homes Through Challenges

Private residence

Commitment & Trust – Building Homes Through Challenges

, Sweden

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Authentic-Style Two-Storey House

Private residence

Authentic-Style Two-Storey House

Amsterdam, Netherlands

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Modern Coastal House with Curved Timber Structures

Private residence

Modern Coastal House with Curved Timber Structures

Akershus, Norway

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Sustainable Engineering: The CLT & SiOO:X Home

Private residence

Sustainable Engineering: The CLT & SiOO:X Home

Leinster, Ireland

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Prefabricated timber frame house

Private residence

Prefabricated timber frame house

Oslo, Norway

View project
View portfolio

Related topics

Frequently asked questions

Questions about U-value, n50, A+ class, energy audit and timber structure solutions.

Comfort, Premium or Lux for an energy-efficient house

Insulation material and panel layers are one part of a building’s energy performance. Choose panels together with the building shape, windows, thermal bridges, heating and ventilation. No panel specification alone guarantees a particular energy class.

Compare Comfort, Premium and Lux layers and pricing conditions. Heating and ventilation are excluded from the panel and exterior-complete package prices, so budget for them separately.

Planning an energy-efficient timber house?

Send project information so ZTC can review the structure and scope against your target.

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