[Custom-built Homes] Approximately 40% Prioritize 'Seismic Resistance' Most in Performance. Which do you prioritize: 'Performance' or 'Price'?
A survey conducted jointly by NEXER Co., Ltd. and Clavis Co., Ltd. on 'Awareness of Performance and Quality in Custom-built Homes' revealed that approximately 40% of respondents consider 'seismic resistance' to be the most important factor. This reflects the high safety consciousness of residents in an earthquake-prone country like Japan.
📋 Article Processing Timeline
- 📰 Published: April 28, 2026 at 19:00
- 🔍 Collected: April 28, 2026 at 10:31
- 🤖 AI Analyzed: April 28, 2026 at 15:19 (4h 47m after Collected)
■ What do you prioritize in 'performance' when building a custom home?
Custom-built homes offer the significant advantage of being designed from scratch to suit one's own lifestyle and family needs.
While floor plans and designs often draw attention, it is actually 'housing performance' that greatly affects comfort and safety once living begins.
There are various performance indicators such as insulation, seismic resistance, and energy efficiency, but what do people who have considered or experienced custom-built homes actually prioritize?
Therefore, in collaboration with Clavis Co., Ltd., we conducted a survey on 'Awareness of Performance and Quality in Custom-built Homes' targeting 139 men and women nationwide who responded in a preliminary survey that they 'have experienced or are considering purchasing a custom-built home.'
*When quoting the content of this press release, please take the following actions:
・Explicitly state that the source is "a survey by NEXER Co., Ltd. and Clavis Co., Ltd."
・Set a link to Clavis Co., Ltd. (https://clavis.co.jp/)
・Set a link to the relevant article (https://clavis.co.jp/blog/blog-3835/)
"Survey on Awareness of Performance and Quality in Custom-built Homes" Overview
Survey Method: Internet questionnaire
Survey Period: March 31, 2026 - April 5, 2026
Target Respondents: Men and women nationwide who responded in a preliminary survey that they 'have experienced or are considering purchasing a custom-built home.'
Valid Responses: 139 samples
Questions:
Question 1: What do you particularly prioritize as 'performance' in a custom-built home?
Question 2: Please tell us the reason.
Question 3: Please select all you know about housing performance. (Multiple answers allowed)
Question 4: What image do you have of a 'high-performance home'? (Multiple selections allowed)
Question 5: When considering a custom-built home, which do you prioritize more, 'performance' or 'price'?
Question 6: Please tell us the reason.
*In principle, numbers are rounded to the second decimal place, so the total may not always be 100%.
■ 41.0% responded that 'seismic resistance' is the most important performance aspect for custom-built homes.
First, we asked what people particularly prioritize as 'performance' in custom-built homes.
The most common answer was 'seismic resistance' at 41.0%.
This was followed by 'insulation' at 15.8%, 'durability' at 12.9%, and 'energy efficiency' at 10.1%.
As Japan is an earthquake-prone country, it is clear that an overwhelming number of people prioritize 'seismic resistance,' which is directly linked to home safety.
On the other hand, performance aspects related to daily comfort and running costs, such as 'insulation' and 'energy efficiency,' also garnered a certain level of support, suggesting that the points of emphasis differ depending on the lifestyle and regional environment of the residents.
We asked for the reasons behind each response, and here are some of them:
Those who responded 'seismic resistance':
・Because I live in a region where a Nankai earthquake is expected. (Female, 30s)
・Because I experienced the Great Hanshin Earthquake. (Female, 40s)
・If the house collapses due to an earthquake, other performance features are meaningless. (Male, 50s)
Those who responded 'insulation':
・Because I don't like the cold. (Male, 40s)
・Because my previous house was very cold in winter. (Female, 50s)
・Because it affects utility costs. (Male, 50s)
Those who responded 'durability':
・Because it's something I'll live in for a long time, durability is important. (Female, 40s)
・Because I plan to live there for a long time, I want it to last. (Male, 50s)
・It's a big purchase, so I want it to last. (Female, 60s)
Those who responded 'energy efficiency':
・Because I want to reduce running costs. (Male, 30s)
・Because electricity and gas prices are apparently going to skyrocket from now on. (Female, 40s)
・Because it can reduce utility costs. (Male, 40s)
Among those who prioritized seismic resistance, many sincere voices cited past earthquake experiences or living in regions where major earthquakes are anticipated. For insulation, dissatisfaction with the cold and the burden of utility costs were prominent reasons. For durability, the common sentiment was "I want my home to last because I'll live in it for life," and for energy efficiency, a high awareness of running costs was evident.
■ 84.9% responded that they know 'seismic rating' as a housing performance indicator.
Next, we asked about knowledge of housing performance. The awareness of 'seismic rating' was remarkably high at 84.9%, followed by 'insulation rating' at 50.4%, 'UA value' at 6.5%, and 'C value' at 3.6%.
Easy-to-understand indicators like seismic and insulation ratings are widely known, but those who understand specialized figures like UA value (average heat transmission coefficient of the outer envelope) and C value (equivalent air leakage area) are still a minority. To correctly compare housing performance, understanding these indicators is crucial.
Custom-built homes offer the significant advantage of being designed from scratch to suit one's own lifestyle and family needs.
While floor plans and designs often draw attention, it is actually 'housing performance' that greatly affects comfort and safety once living begins.
There are various performance indicators such as insulation, seismic resistance, and energy efficiency, but what do people who have considered or experienced custom-built homes actually prioritize?
Therefore, in collaboration with Clavis Co., Ltd., we conducted a survey on 'Awareness of Performance and Quality in Custom-built Homes' targeting 139 men and women nationwide who responded in a preliminary survey that they 'have experienced or are considering purchasing a custom-built home.'
*When quoting the content of this press release, please take the following actions:
・Explicitly state that the source is "a survey by NEXER Co., Ltd. and Clavis Co., Ltd."
・Set a link to Clavis Co., Ltd. (https://clavis.co.jp/)
・Set a link to the relevant article (https://clavis.co.jp/blog/blog-3835/)
"Survey on Awareness of Performance and Quality in Custom-built Homes" Overview
Survey Method: Internet questionnaire
Survey Period: March 31, 2026 - April 5, 2026
Target Respondents: Men and women nationwide who responded in a preliminary survey that they 'have experienced or are considering purchasing a custom-built home.'
Valid Responses: 139 samples
Questions:
Question 1: What do you particularly prioritize as 'performance' in a custom-built home?
Question 2: Please tell us the reason.
Question 3: Please select all you know about housing performance. (Multiple answers allowed)
Question 4: What image do you have of a 'high-performance home'? (Multiple selections allowed)
Question 5: When considering a custom-built home, which do you prioritize more, 'performance' or 'price'?
Question 6: Please tell us the reason.
*In principle, numbers are rounded to the second decimal place, so the total may not always be 100%.
■ 41.0% responded that 'seismic resistance' is the most important performance aspect for custom-built homes.
First, we asked what people particularly prioritize as 'performance' in custom-built homes.
The most common answer was 'seismic resistance' at 41.0%.
This was followed by 'insulation' at 15.8%, 'durability' at 12.9%, and 'energy efficiency' at 10.1%.
As Japan is an earthquake-prone country, it is clear that an overwhelming number of people prioritize 'seismic resistance,' which is directly linked to home safety.
On the other hand, performance aspects related to daily comfort and running costs, such as 'insulation' and 'energy efficiency,' also garnered a certain level of support, suggesting that the points of emphasis differ depending on the lifestyle and regional environment of the residents.
We asked for the reasons behind each response, and here are some of them:
Those who responded 'seismic resistance':
・Because I live in a region where a Nankai earthquake is expected. (Female, 30s)
・Because I experienced the Great Hanshin Earthquake. (Female, 40s)
・If the house collapses due to an earthquake, other performance features are meaningless. (Male, 50s)
Those who responded 'insulation':
・Because I don't like the cold. (Male, 40s)
・Because my previous house was very cold in winter. (Female, 50s)
・Because it affects utility costs. (Male, 50s)
Those who responded 'durability':
・Because it's something I'll live in for a long time, durability is important. (Female, 40s)
・Because I plan to live there for a long time, I want it to last. (Male, 50s)
・It's a big purchase, so I want it to last. (Female, 60s)
Those who responded 'energy efficiency':
・Because I want to reduce running costs. (Male, 30s)
・Because electricity and gas prices are apparently going to skyrocket from now on. (Female, 40s)
・Because it can reduce utility costs. (Male, 40s)
Among those who prioritized seismic resistance, many sincere voices cited past earthquake experiences or living in regions where major earthquakes are anticipated. For insulation, dissatisfaction with the cold and the burden of utility costs were prominent reasons. For durability, the common sentiment was "I want my home to last because I'll live in it for life," and for energy efficiency, a high awareness of running costs was evident.
■ 84.9% responded that they know 'seismic rating' as a housing performance indicator.
Next, we asked about knowledge of housing performance. The awareness of 'seismic rating' was remarkably high at 84.9%, followed by 'insulation rating' at 50.4%, 'UA value' at 6.5%, and 'C value' at 3.6%.
Easy-to-understand indicators like seismic and insulation ratings are widely known, but those who understand specialized figures like UA value (average heat transmission coefficient of the outer envelope) and C value (equivalent air leakage area) are still a minority. To correctly compare housing performance, understanding these indicators is crucial.