[Renovation] Should I make a last-minute purchase? List of manufacturers that have decided to raise prices of building materials/fittings in Japan from 2026 [Renovation]

12/29/2025

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Hello everyone, this is DIY Renova.

“I heard that the price will go up in 2026, but should I buy it now?”
When doing self-renovation, the effects of price increases will be more direct on items that are more expensive and difficult to change later, such as windows, doors, kitchens, and flooring.

However, if you rush to buy, you may end up losing money due to problems with storage space, changes in specifications, warranties/model changes, and non-cancellation. In this article, as of December 28, 2025, we will organize the manufacturers whose prices have been announced for 2026 from a DIY perspective, and summarize them in one book that will help you decide on last-minute purchases.

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Please note that this document is not necessarily accurate, and should be used as reference information only.

So, here you go.

Table of Contents

Important note first

The “price increase date” is easily misinterpreted even when announced by the manufacturer.

There are three main criteria for price revisions:

"From orders": Based on the day the order is received (for DIY, the timing of estimate → order is important)
“From the order”: The standard is the date when the retailer/agent places the order with the manufacturer (if it is DIY, the processing date on the shop side may deviate)
"From shipments": Factory shipments are the standard (it's easy to cross over if the delivery time is long)

It is safe to always check the manufacturer's wording and ask the retailer what timing is the applicable standard (the table in this article is based on the standard dates announced by each company).

"Revision rate" is a guideline. Up and down by product number

Even within the same manufacturer, revision rates usually vary greatly depending on series and options. For example, LIXIL shows the average revision rate for each category, but only for "some products."LIXIL Corporation.

List of manufacturers with “price revisions announced” in 2026

The list below is limited to only those that have been confirmed as "official release/official publication page" or "reported as release content in industry newspapers" (information that is only rumored or spread on SNS is not included).

Manufacturer	Main targets (building materials/fittings/housing equipment)	Implementation timing of price revision	Approximate revision rate	basis
LIXIL	Parts of residential sashes/doors, metal siding, exteriors, building sashes, etc.	From 2026/4/1 (*some 5/1) orders	The average cost for residential sashes and doors is about 5%, and the average cost for metal siding is about 5%.	LIXIL Corporation.
YKK AP	Residential products, exteriors, metal exterior materials, building products	From orders received on May 1, 2026 (report basis)	Approximately 5-10% (report)	Shinken Housing. Kensetsu Tsushin Shimbun Digital.
Panasonic	Electrical materials, lighting, system equipment, branch faucets, built-in dishwashers, air conditioners for residential equipment	2026/1/1~4/1 (varies by item)	Presented in separate sheet (width by item)	Panasonic Newsroom Global.e-sugimoto.co.jp.
Eidai Industry (EIDAI)	Flooring, interior stairs, interior doors, storage, etc.	From orders received on January 5, 2026	5% (release description/reporting)	eidai.com.eidai.com.
takara standard	Part of the kitchen, bathroom, washroom etc.	From orders placed on April 1, 2026	Width by product (e.g. 7-10% for kitchen set)	Hashimoto Sogyo Co., Ltd.

By manufacturer: Focus only on the points that have a big impact on DIY

LIXIL (2026/4/1~Partly 5/1)

LIXIL has announced ``partial revisions to manufacturer's suggested retail prices'' for building materials and equipment, and the implementation date is ``from April 1, 2026 (sometimes May 1) for orders received''.LIXIL Corporation.
The scope is wide-ranging, and the following points should be especially noted if they are directly connected to DIY.

"Residential sashes and doors": Average of about 5% (however, there are some cases where the average is about 10%, so there are differences depending on the category)biz-lixil.com.
"Metal siding (main body/accessories)": Average of about 5%biz-lixil.com
"Exterior (fences, gates, carports, decks, etc.)": Average of about 5% is often mentioned.biz-lixil.com

Reality from a DIY perspective:
For windows, entrance doors, and exterior systems, the process of ``on-site measurement → finalization of specifications → delivery date'' is long, and it may be too late to get things started in the new year in order to make it in time before the price increases. Especially when it comes to windows, the opening dimensions must be determined, so those who haven't finished demolition are more likely to rush into buying and make mistakes.

YKK AP (from orders received on May 1, 2026, based on press)

According to a report in the industry press, YKK AP will revise the prices of residential products, exterior products, metal exterior materials, and building products "from orders received on May 1, 2026," and the price increases will be "approximately 5 to 10%."Shinken Housing.

Things that often come up for DIY are sashes, entrance doors, shutters, exterior materials, balconies, and fences.
This can easily cost hundreds of thousands of yen to several million yen for a complete set, so even a few percent revision rate is painful.

Note:
Since it is based on news reports, it is a good idea to check the ``manufacturer's official information document (PDF)'' at the store before actually placing an order (most stores have it).

Panasonic (2026/1/1~4/1)

Panasonic has different revision dates for each item, and if you are doing DIY, you will be stuck at the timing of electrical work and equipment updates.

Electrical equipment materials (wiring equipment, electrical equipment panels, piping equipment, etc.): 2026/1/1Panasonic Newsroom Global
Lighting equipment: 2026/1/1Panasonic Newsroom Global
Branch faucet: 2026/2/1Panasonic Newsroom Global
Built-in dishwasher: 2026/3/1Panasonic Newsroom Global
Air conditioner for residential equipment: 2026/4/1Panasonic Newsroom Global

Tips from a DIY perspective:
While it is relatively easy to make last-minute arrangements for electrical equipment materials and lighting ``if the part number is confirmed,'' they are also affected by model changes and specification changes. In particular, when it comes to housing equipment, the sooner you buy it and put it to rest, the more disadvantageous it may be in terms of warranties starting and early failure handling, so it is best to only buy items that will be installed soon.

Eidai Industry (EIDAI) (from orders received on January 5, 2026)

Eidai Sangyo has announced that it will revise the catalog prices for flooring materials, interior stairs, interior doors, storage, etc. starting from January 5, 2026, for orders received.eidai.com.
Reports say the price increase will be 5%.Shinken Housing

The areas that are most affected by DIY are floors, fittings, and storage.
The pitfall here is that it's easy to move backwards due to the order of construction. If you buy it, the storage space will be hell.

Takara Standard (from orders placed on April 1, 2026)

Takara Standard has issued a notice of price revision "from orders placed on or after April 1, 2026."Hashimoto Sogyo Co., Ltd.
The revision rate is written for each product, such as 7 to 10% for a kitchen set example.Hashimoto Sogyo Co., Ltd.

What you need to be careful about when doing DIY is that it is not a "last minute purchase".
When it comes to kitchen units, if you don't plan on-site dimensions and fit, you'll end up with a worst-case combination of ``it won't fit'', ``you can't read the delivery date'', and ``the piping doesn't match up''. If you are in a hurry, the first thing you should do is not to purchase, but to ``determine the plan and dimensions.''

Deciding on a last-minute purchase by asking 5 questions

Even if a price increase is confirmed, not everyone should rush in. Especially if you are doing DIY, you will be less likely to have an accident if you mechanically sort the items using the following five methods.

Question 1: Are the specifications (product number, color, style) "confirmed"?

If you are not sure, don't make last-minute purchases.
When it comes to fittings and sashes, there are many simple items such as ``left and right hand'', ``frame orientation'', ``opening direction'', and ``handle color''.

Question 2: Is there a place to store it? Can you eliminate the risk of humidity, sunlight, and deformation?

Wood-based materials (flooring materials and fittings) are prone to warping and twisting due to fluctuations in moisture content (simply put, ``the dimensions change due to absorbing and expelling moisture'').
If you are making a last-minute decision, decide on storage conditions first.

"Thick stretch film that can be used to store flooring materials"
"Slatted/Pallet (lifted off the floor)"
"Dehumidifier/Hygrometer"
Even if you buy something like this, it is directly connected to the work.

リンク

Question 3: Does it have a long delivery time?

Delivery times for windows, entrance doors, kitchens, and some exterior parts are difficult to predict, so it is worth placing orders before prices go up. On the other hand, there is no need to rush when it comes to consumables that can be purchased immediately.

Question 4: Is the price increase targeted for "large amount categories"?

Even if it is 5%, if it is 1 million yen, it is 50,000 yen.
The higher the unit price, such as floors, fittings, windows, and kitchens, the more cost-effective the last-minute construction will be.

Question 5: Do you understand the cancellation policy?

When manufacturing to order is involved, it is common for orders not to be cancelled. With DIY, it's easy to get lost in the process, so if you rush into the process without making this point vague, you'll end up losing money instead of avoiding price increases.

2026 If you want to make a move before the price rises, what to do before “buying”

This is simple, but it works.

1) Confirm the base date for price increase in "Order acceptance/Order placement/Shipping"

LIXIL clearly states that it is based on orders received.LIXIL Corporation.
Panasonic also clearly indicates the revision date for each item.Panasonic Newsroom Global
If there is no such clear statement (or it is based on reports), the quickest way is to check the documentation at the store.

2) Leave the "expiration date of quotation" and "conditions for price deferral" in writing.

Even with the same “estimate”,

Prices are not guaranteed until orders are received.
Order must be placed within 〇 days
Logistics costs vary separately
etc. are possible. If you do DIY, it's easier to mess up later, so it's safer to leave it by email.

3) Make the storage area and delivery line first

The more expensive building materials you buy, the more your home becomes a material warehouse the moment you receive it.
The success or failure of a last-minute purchase is often determined by "logistics and storage" rather than construction ability (and this is the source of the most stress).

Manufacturers and items whose prices have already increased recently

This is a part that summarizes representative examples of price revisions that have already been implemented in 2025 (base date: December 28, 2025).
同じメーカーでも「対象外の商品」や「オプションだけ改定」などが混ざるので、発注前は必ず一次資料（メーカー告知）と販売店の適用基準（受注/発注/出荷）を確認してください。

List of recent price increases (mainly in 2025)

Manufacturer	Price revision begins to apply	Main targets (items that are likely to be encountered during DIY)	Approximate revision rate	reference
NORITZ	From January 6, 2025	Gas water heater equipment, oil water heater equipment, related parts (remote controls/pipe covers, etc.), built-in stoves/range hoods, etc.	Approximately 3 to 15% in hot water field, approximately 3 to 40% in related components, etc.	(Noritz official)Noritz Co., Ltd.'s corporate information site.
LIXIL	From orders received from April 1, 2025	"Some products (including parts)" such as residential sashes, doors, exteriors, siding, etc.	Example: Residential sashes/doors 3-12%, etc. (varies by category)	(LIXIL official)LIXIL Corporation.
Rinnai	From May 1, 2025	Water heating equipment, kitchen equipment, etc. (applies to products sold in Japan. Revision rates are listed for each product group)	Example: Water heating equipment 1-12% (average 4%), etc.	(Rinnai official)Rinnai.
YKK AP	From April 1, 2025/May 1, 2025 orders (by category)	General exterior products, Lucius balconies, metal exterior materials (accessory parts), etc. Depending on the category, orders for residential products will start from May 2025.	Example: Exterior approx. 4-15%, metal exterior materials (accessories) approx. 10%, etc.	(Price revision guidance document in the name of YKK AP)sg-news.sungreen.co.jp
AICA Industry (AICA)	From shipments from June 2, 2025	Melamine decorative board (all product numbers)	Approximately 10-15% of the design price	(Aica Kogyo Price Revision Guide PDF)Aica
AICA Industry (AICA)	From shipping on July 1, 2025	Design price for housing equipment building materials (details depend on target category)	Approximately 10% (approximately. There are exceptions)	(Aica Kogyo Product News)Aica
AICA Industry (AICA)	From shipping on July 22, 2025	Non-combustible decorative boards (Ceral, etc.) and auxiliary materials (including bath panel systems)	Design price revision (details in announcement)	(Aica Kogyo Product News)Aica
Cleanup	From orders placed on September 1, 2025	"Some products" such as related equipment (e.g. description of bathroom mirror cabinet, etc.)	Approximately 4-10% (about 5% on average)	(Cleanup official PDF/official announcement)Cleanup.
TOTO	From orders received on October 1, 2025	Housing equipment (targeted products and average revision rate announced)	Average revision rate is stated in official materials (differences depending on target category)	(TOTO official)TOTO Co., Ltd.

Why do prices continue to rise?

Manufacturers tend to cite raw materials, fuel, logistics, and exchange rates as reasons for price increases. LIXIL mentions the impact of raw materials, parts, logistics costs, etc.LIXIL Corporation
The construction cost index also shows an increase in the index for housing (wooden construction).Construction price portal
In addition, peer-reviewed studies overseas have generally concluded that disruptions in the supply network lead to increases in construction materials and equipment prices.athensjournals.gr.

In other words, DIY-wise,
It is OK to understand that this is a phase in which the costs of not only ``the materials themselves'' but also ``transportation, production, and inventory'' are accumulating.

Summary: Last-minute purchases are only for those who meet the “winning conditions”

At least LIXIL, Panasonic, Eitai Sangyo, Takara Standard, and YKK AP (report) have announced price revisions for 2026.Shinken Housing等
It is easy to make a profit with last-minute purchases in high-priced categories such as windows, doors, kitchens, floors, and fittings.
However, in DIY, if the storage location and specifications are weak, you are likely to lose.
If you are unsure, you will be less likely to lose if you start by ``confirming order standards'', ``writing quotation conditions'', and ``creating a storage environment''.