Keishosha, Ltd. Keishosha, Ltd.
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Conservation of historic and cultural-property buildings planning, survey, design, supervision

Carrying history
into the future.

Keishosha is a Japanese architectural practice devoted to historic and cultural-property buildings. We take a building from survey and conservation planning through to repair design and on-site supervision, so that what has been repaired many times over the centuries can be handed on once more.

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ABOUT

Passing buildings on

What we inherited from the past,
we pass on to what comes next.

A historic building survives because it has been repaired, again and again. Reading carefully how it was built, and how each generation chose to mend it, is where the next repair begins.

We handle the whole sequence in one office — conservation planning, survey, design and construction supervision — so that a building can keep being used without losing what makes it worth keeping.

We work anywhere. Our record is in Japan, but we are glad to travel, and we welcome enquiries about projects outside the country — whether that means a survey, a conservation plan, or working alongside a local team.

Keishosha (継承社) means “the company that carries things forward”.
The name and the mark say what we are for.
SERVICES

What we do

01

Survey

  • Condition survey and measured drawings
  • Deterioration survey and diagnosis of causes
  • Review of applicable regulations
02

Design & Supervision

  • Design for repair works
  • Construction supervision of repair works
  • Seismic strengthening: design and supervision
03

Consultancy

  • Conservation and management plans
  • Master plans for repair and improvement
  • Survey reports and documentation
PROCESS

How we work

STEP 01

Consultation

We begin by listening — your intentions, budget and constraints, and whatever is troubling you about the building. We work with grounds and gardens as well as with structures.

STEP 02

Survey

We carry out the survey work needed to establish the building’s present condition and the extent of deterioration, and confirm the regulations that apply.

STEP 03

Proposal

Drawing on the consultation and the survey, we set out what is possible and put a proposal to you.

STEP 04

Schematic design

The proposal is developed in detail through meetings and presentations until it becomes a schematic design you are satisfied with, together with an estimate of construction cost.

STEP 05

Detailed design

From the schematic design we prepare the drawings needed to tender and let the works.

STEP 06

Contractor selection

We review tenders and costs, and advise on the choice of contractor.

STEP 07

Construction supervision

We convey the design intent clearly to the contractor and inspect the works, so that everything is built in accordance with the contract documents.

WORKS

Selected works

Important Cultural Property

Former Hinjitsukan — conservation and management plan 重要文化財旧賓日館 保存活用計画策定業務委託

Conservation and management plan for an Important Cultural Property
June 2023 ─ March 2025

Prefecturally designated

Ito Family Residence, main house — detailed repair design 伊藤家住宅主屋修理その他設計委託

Detailed design for repair works to a prefecturally designated property
July 2024 ─ March 2026

Prefecturally designated

Kasuga Shrine worship hall — supervision of dismantling repair 春日神社拝殿 解体修理工事監理業務委託

Construction supervision of dismantling repair works
July 2017 ─ March 2023

Municipally designated

Former Yogo Village Office — supervision of restoration and repair 市指定文化財「旧四郷村役場」復原・修理ほか工事監理業務委託

Construction supervision of restoration and repair works
October 2021 ─ March 2023

COMPANY

Company profile

Name
Keishosha, Ltd.
株式会社 継承社
Representative
Tomohiro Konagaya, President
Class-1 Architect (一級建築士) — the national architect licence of Japan
Established
1 May 2014
Offices
Head office 208-35 Otani-cho, Tsu, Mie 514-0007, Japan
Tel +81-59-226-2950

Nagoya office Meiko Building 2F, 1-17-13 Nishiki, Naka-ku, Nagoya, Aichi 460-0003, Japan
Tel +81-52-766-7215
Services
Architectural consultancy
Conservation and management planning/survey, design and construction supervision/branding/construction management
Registered architectural office
Architectural design and construction supervision
Registration
Registered architectural office, Governor of Mie Prefecture No. 1-2257
Registered 22 May 2024 / Managing architect: Tomohiro Konagaya, Class-1 Architect
Languages
Enquiries in English are welcome.
Our working language is Japanese. We read and reply to English correspondence with the help of translation, and would arrange an interpreter for meetings and site work. Please do write in English — it will reach us.

Tell us about your building.

A survey, a plan, or simply a first conversation — all are welcome, wherever the building stands.

info@keishosha.co.jp
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