Operator field data — collected on site at Asuntomessut 2026, Lempäälä (29 July 2026) How we read the data

Kohde 5 · Asuntomessut 2026

Completed

Rentohelmi

built by TUPLA-J Rakennus Oy93 · 2 bed

About this project

Rentohelmi is a detached house with one floor and two bedrooms, offering a living area of 93 m² and a gross area of 113 kem², and stands on a 760 m² plot with a building right of 300 m². The open living-kitchen space is 34.6 m², complemented by a 2.1 m² sauna. The house features a timber frame structure and a facade of vertical panel 145 mm with an accent false panel 145 mm. Heating is managed by water underfloor heating, an exhaust-air pump Nibe F470, and Alpic Air.

93 total area
Where
As built

Project specifications

Areas & dimensions

Living area93 m²
Gross floor area113
Living room & kitchen34.6 m² open space
Plot760 m², building right 300 m²

Construction & systems

Frametimber frame
Facadevertical panel 145 mm + accent false panel 145 mm
Heatingwater underfloor + exhaust-air pump Nibe F470 + Alpic Air

Other

sauna2.1 m²
Budget

Build a budget

93 m² from the model
1House-kit level
Subtotals by group
Plot and permits710 – 2 090 €
Catalogue norm
Design4 480 – 12 980 €
Catalogue norm
Connections1 500 – 6 500 €
Catalogue norm
Site works17 230 – 48 950 €
Catalogue norm
House kit167 400 – 232 500 €
Catalogue norm1800–2500 €/m² × 93 m²
Technical systems
Included in the kit
Interior and finishing
Included in the kit
Other costs16 170 – 38 938 €
Catalogue norm
Specialist designs (heating/vent/water/electrical)Not added
B2Included in the kit
Heating — air-to-water heat pump, installedNot added
F1Included in the kit
Heat-recovery ventilationNot added
F3Included in the kit
Internal electrical and low-voltageNot added
F4Included in the kit
Internal plumbing and sanitary wareNot added
F5Included in the kit
Interior finishing (below turnkey stage)Not added
G1Included in the kit
Every row states its source. No figure is a model's guess.
See it line by line
2Build locationThe county adjusts the local-work lines — site works, connections, permits — not the house kit.
3Do you have a plot?
A plot with a detailed plan saves both money and months.
Helps manufacturers check the model fits your plot.
4What is already on the plot?
Electricity
Water and sewer
Connections are the cost buyers most often miss.
5How will you finance it?
207 490 – 341 958 € excl. VAT · 2 231 € / m²Indicative range, not a quote. Every row states its source.
In progress & finished

Construction & reveal photos

Coming soon

Built by

TUPLA-J Rakennus Oy
Since 2023
View profile

Project credits

Pääsuunnittelija (principal designer)
Anna Jokela
Architecture
Helmitalo (TUPLA-J Rakennus Oy)Noora Sievola
Landscape design
Maisemasuunnittelu Mygarden, Nina Bergström
Contractor
Helmitalo (TUPLA-J Rakennus Oy)
Supplier
Lammin Ikkunat ja OvetLinnatuliNoblessa
Operator field data — collected on site at Asuntomessut 2026, Lempäälä (29 July 2026) How we read the data

Kohde 5 · Asuntomessut 2026

Completed
Rentohelmi
by TUPLA-J Rakennus Oy
932 bed

About

Rentohelmi is a detached house with one floor and two bedrooms, offering a living area of 93 m² and a gross area of 113 kem², and stands on a 760 m² plot with a building right of 300 m². The open living-kitchen space is 34.6 m², complemented by a 2.1 m² sauna. The house features a timber frame structure and a facade of vertical panel 145 mm with an accent false panel 145 mm. Heating is managed by water underfloor heating, an exhaust-air pump Nibe F470, and Alpic Air.

Where

As built

Project specifications

Areas & dimensions

Living area93 m²
Gross floor area113
Living room & kitchen34.6 m² open space
Plot760 m², building right 300 m²

Construction & systems

Frametimber frame
Facadevertical panel 145 mm + accent false panel 145 mm
Heatingwater underfloor + exhaust-air pump Nibe F470 + Alpic Air

Other

sauna2.1 m²
Budget

Build a budget

93 m² from the model
1House-kit level
Subtotals by group
Plot and permits710 – 2 090 €
Catalogue norm
Design4 480 – 12 980 €
Catalogue norm
Connections1 500 – 6 500 €
Catalogue norm
Site works17 230 – 48 950 €
Catalogue norm
House kit167 400 – 232 500 €
Catalogue norm1800–2500 €/m² × 93 m²
Technical systems
Included in the kit
Interior and finishing
Included in the kit
Other costs16 170 – 38 938 €
Catalogue norm
Specialist designs (heating/vent/water/electrical)Not added
B2Included in the kit
Heating — air-to-water heat pump, installedNot added
F1Included in the kit
Heat-recovery ventilationNot added
F3Included in the kit
Internal electrical and low-voltageNot added
F4Included in the kit
Internal plumbing and sanitary wareNot added
F5Included in the kit
Interior finishing (below turnkey stage)Not added
G1Included in the kit
Every row states its source. No figure is a model's guess.
See it line by line
2Build locationThe county adjusts the local-work lines — site works, connections, permits — not the house kit.
3Do you have a plot?
A plot with a detailed plan saves both money and months.
Helps manufacturers check the model fits your plot.
4What is already on the plot?
Electricity
Water and sewer
Connections are the cost buyers most often miss.
5How will you finance it?
207 490 – 341 958 € excl. VAT · 2 231 € / m²Indicative range, not a quote. Every row states its source.

Construction photos

Coming soon

Built by

TUPLA-J Rakennus Oy
since 2023

About this build

Total floor area
93 m²
Floors
1
Bedrooms
2

Project credits

Pääsuunnittelija (principal designer)
Anna Jokela
Architecture
Helmitalo (TUPLA-J Rakennus Oy)Noora Sievola
Landscape design
Maisemasuunnittelu Mygarden, Nina Bergström
Contractor
Helmitalo (TUPLA-J Rakennus Oy)
Supplier
Lammin Ikkunat ja OvetLinnatuliNoblessa