21 ADD Modular Homes

Designed by Your Nature

What is 21 ADD?

We are a team of experts and professionals, driven by a shared vision. Our mission is to create homes that prioritize the health and comfort of residents, allowing them to thrive in harmony with the surrounding nature.

ADD stands for autonomous, energy‑plus buildings. The technology we developed grants independent sources of electricity, heat and cooling. Experience the benefits of naturally clean water and air while saving money.

The 21 ADD house was developed operating under the pre‑commercial procurement in a research and development formula by the EU award winning Polish National Centre for Research and Development

We believe that where we live determines the quality of our lives.

Discover the optimal living space, grown and nourished with the surrounding nature.

Living in a 21 ADD home is easy, energy‑saving and ecological

What’s inside?

usable area

96.78 m²

buiding area

123.86 m²

Energy saving and ecology made simple

Only 25.4 kWh/m² of energy is required annually for heating, domestic hot water supply, and ventilation.

By using environmentally friendly sources the building creates more energy than it needs.

Low carbon footprint of building materials – 217.68 kg CO2/m².

46% of our building materials come from recycling.

21 construction days

We make 90% of your house in our factory, so it takes less time to deliver. After making the modules, we usually need 21 days to build the house on your property.

Build and save money

Our technology makes building houses cheaper than traditional methods. We reduced the required workforce and waste production. We also use less energy and made construction more weather resistant. In order to make the process more energy efficient we use recycled building materials.

What sets us apart from other options is that our building price covers the cost of installations, which are essential for creating your ideal living space.

The cost of each house may vary based on individual preferences and the location of the building plot. Please contact us to discuss your specific requirements and get an accurate price for your future home. 

What is the approximate cost of a 21 ADD house?

developer’s standard

6,000 PLN/m²

turnkey house

8,000 PLN/m²

Do you need a custom house design? ​

We want your future home to be just right for you. We can help you with house design ideas or create a custom design based on your specific preferences.

Discover our building technology

Factory‑made modules

At 21 ADD, we manufacture modular buildings using the LSF (Lightweight Steel Frame) technology, filled with our custom‑made SGW mortar blend.

Thermal insulation

μ = 0,1

Sound insulation

46 dB

Fire resistance

REI = 120 min.

Airtightness

n50 = 0,4 h-1

Outstanding performance verified by laboratory testing

The LSF structure is covered with SGW mortar, making it an exceptionally sturdy, airtight, sound-absorbing, and fire‑resistant one‑piece construction.

Installations

A home to us is far more than just structure and mortar. Creating the optimal living space requires combining a range of solutions. To realize our vision:

The majority of components and technologies required for module production are either sourced or can be produced locally in Poland.

The installation cost is already included in the building price!

Eco-Power Solutions

Say goodbye to electricity bills – our homes are equipped with self‑sustaining energy sources. We’ll help you configure the equipment to generate the exact amount of power you need. And if theres any excess production, you can even sell it back to the grid.

Solar Panels

Harness the sun’s energy to generate electricity that covers your entire power needs.

Energy Storage Systems

Store the surplus energy produced on sunny days, ensuring you always have a reliable power supply.

EV Charger

We can provide a home charger for your electric vehicle, delivering clean energy to keep you on the move.

Heating, Ventilation, Air Conditioning

At 21 ADD, we prioritize natural, energyefficient, and ecofriendly solutions for heating and cooling your home. So, what are the technologies we employ?

Heat pump

Residents have an independent and efficient source for both heating and cooling.

Heat storage tanks

To boost the heat pump’s performance, we use heat storage tanks with solar collectors for hot water.

Capillary mats

For a comfortable and even distribution of temperature, we implement capillary mats throughout the rooms.

88% water savings

We can make the house eco‑friendly with water‑saving solutions based on your plot’s conditions. All in harmony with the surrounding nature.

Wastewater treatment

We treat wastewater using a two‑stage process, including a reed bed system, making it safe for toilet flushing and watering the garden.

Rainwater harvesting

The system collects rainwater and purifies it, providing enough water for monthly household needs.

Connection

In the future, if you get permission for a wastewater treatment system, the basic setup will be ready to connect to the water‑saving system.

Health is in the air!

Our custom‑made ventilation system prioritizes the health and comfort of the residents while conserving heat in the building.

Health

The filters effectively purify the incoming air from pollutants

Comfort

The system regulates air humidity and CO2 levels in the rooms

Savings

We optimize heat energy use with a high‑efficiency recovery system.

Ideal conditions in your spaces

For your utmost comfort, we’ve synchronized all installations with the Building Management System. BMS optimizes your spaces daily, ensuring ideal conditions for your well‑being and health.

Automation

With BMS, you gain full control over the building’s installations which automatically adjust to your needs and preferences.

Cost efficiency

Additionally, the application efficiently manages thermal and electrical energy, aiming to minimize consumption at all times.

COMING SOON

Supportive Space for Independent Seniors

Our society is rapidly getting older. By 2050, according to GUS stats, over 42% of Poles will become senior citizens. At the same time, there are fewer people available to look after them.

The 21 ADD Senior Home is designed for a wide range of needs that older residents have. We blend 21 ADD technology with solutions that help seniors go about their everyday life within a small community.

About us

Introducing 21 ADD – Dr. Ludomir Duda, a thermodynamics expert and climate advocate, brought this innovative idea to life, working alongside his son, Jan.

We’re dedicated to developing and implementing eco-friendly and energy-positive solutions for residential construction.

Our concepts, designs, and modular buildings have successfully passed testing by the Polish National Centre for Research and Development. We’re proud to advance the 21 ADD technology through the “Energy and Process-Efficient Construction” initiative, supported and funded by NCBR. Join us in building a sustainable future!

Contact us!

We’re here to help. Feel free to ask any questions, and we’ll be happy to provide answers and advice. Just give us a call or send us an email!

Email

biuro@21stopni.pl

Phone number

+ 48 512 059 100

Address

Ostroroga 18c, Warszawa