What is the floor-area ratio in Rokurokuso-cho, Ashiya?

Rokurokuso-cho is mainly Category-1 low-rise residential, so the FAR is roughly 100–150%. But the private covenant from the original subdivision fixes the minimum plot size, walls, exterior colour and even structure — you cannot build in breach of it even if you meet the statutory limits. Confirm the covenant before buying.

Where in Ashiya are the rules strictest?

Rokurokuso-cho. Its building covenant is often called Japan's strictest, fixing the minimum plot size (barring subdivision), wall height and material, garish colours and even commercial use. Ashiya also has city-wide landscape districts governing height, exterior colour and roof pitch.

Does building on Ashiya's hillside cost more?

Usually yes. On the slopes of Rokurokuso and Iwazono, retaining walls, earth-retention and pile foundations are a given, and site-preparation alone can add 20–30% to the build cost. The gap with the flat areas shows up in preparation cost, not just land price.

Build in Ashiya — Japan's most prestigious residential city

Ashiya

In Ashiya — Japan's wealthiest city per capita — we deliver luxury homes that blend Hanshin Modernism heritage with contemporary architecture, navigating strict zoning, aesthetic ordinances, and private covenants.

Key districts

Rokurokuso-cho

Premier traditional luxury district, strict private covenants

Funato / Asahigaoka

Newer high-end residential, sea-mountain views

Iwazono-cho

Near Hankyu Ashiyagawa Station, green hillside luxury

Okuike

Rokko upper foothills, secluded villa-style residential

What you can build, by Ashiya district

Within Ashiya, what you can build changes sharply by district — driven by zoning, private covenants and terrain (figures are guides; confirm per plot).

District	Zoning / FAR tendency	Specific constraint	What suits it
Rokurokuso-cho	Mostly Cat-1 low-rise, FAR ~100–150%	Private covenant fixes min plot size, walls, exterior colour, even structure; subdivision nearly barred	Low-rise grand residences, covenant-compliant
Iwazono / hillside	Cat-1 low-rise + landscape ordinance	Height/eaves/roof-pitch rules; slopes add 20–30% for retaining walls & piling	2–3 storeys exploiting the view
Funato / flat area	Cat-1 low-rise to mid-rise	Landscape ordinance applies; covenants comparatively mild	Freer custom homes
Okuike	Villa-like, includes control areas	Urbanisation-control zones need build permits; check infrastructure	Villas / second homes

Rokurokuso-cho's private covenant is among Japan's strictest — even if you clear the statutory limits (FAR etc.), you cannot build in breach of it. Confirm the covenant before buying. See landscape ordinances and the building-regulations guide.

Climate & environment

Between Osaka and Kobe climates. Summer rokko-oroshi (humid sea breeze), winter winds from Rokko mountains. Unique microclimate influenced by both sea and mountains.

Building considerations

**Among Japan's strictest** building and aesthetic ordinances — height, eave position, exterior color, roof pitch all regulated
**Private covenants** in Rokurokuso etc. (development-era building rules) must be checked and complied with
Hillside retaining-wall, slope stabilisation, pile foundations (20-30% cost premium factor)
Detailed neighbour coordination (privacy, sightlines, construction-noise)
Hanshin Modernism / hybrid Japanese-Western mansion aesthetic considerations
Overseas-owner and executive-tier clients require English / Chinese consultation

Featured project

Ashiya · Case study

Ashiya single-family home

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What we assess first before you build here

Common plot issues here

Private covenants (Rokurokuso etc.) bind minimum plot size and even structure — check before purchase
The scenic ordinance regulates height, wall colour and roof pitch
Slope retaining walls and piles can add 20–30% to build cost

Reading land prices here

Levels differ sharply between Rokurokuso/the hills and the flats. Read the published standard-lot prices for the tiers — we verify specific plots free before you buy.

Our first-pass check (free)

Zoning, district plans and ordinances
Road access and front-road width (effective FAR)
Level differences and retaining walls
Ground quality and improvement-cost risk
Budget guide and schedule

Cases & further reading

Check your plot (free)Send plot details for a first assessment

Land prices can be checked against the official published prices (MLIT). We look up your specific plot free of charge.

Access & coverage

25 min by JR/Hanshin/Hankyu train from our Osaka office, 35 min by car. Walking distance from JR Ashiya, Hanshin Ashiya, and Hankyu Ashiyagawa stations. Monthly multiple site visits with owner-present meetings.