The local building code

Why this is the first step

Designing a building does not start with the floor plan but with what the plot allows. The local building code (HÉSZ) and the regulation plan that goes with it set the framework, and they differ from municipality to municipality — and from zone to zone.

If this only emerges during the design, part of the work done so far is lost.

What it typically governs

• Zoning: what use of building may be placed there.
• Coverage: what percentage of the plot may be built on.
• Building height.
• Siting: front, side and rear setbacks, the buildable area.
• Green space ratio.
• Roof form and pitch, sometimes covering and colours.
• Stipulations on materials in areas protected for townscape reasons.
• Local parking rules.

What counts particularly on a light gauge steel project

The height limit

A light gauge steel floor and roof are often shallower than traditional ones. Under a height limit that is an advantage: more ceiling height is left within the same permitted height.

Townscape expectations

Townscape rules generally concern appearance — roof form, façade material, colours — not the structure. A light gauge steel frame can be paired with any façade, so this is rarely a real constraint; it turns into a question about the build-up instead.

Coverage and the floor plan

A tight coverage ratio often produces a narrow, long building, which raises bracing questions. That has to be watched in the structural design.

How to get hold of it

The local building code in force is available from the municipality and in the publicly accessible planning databases. In case of doubt the chief architect or the building authority can advise.

For a specific plot, ask for written information: verbal information cannot be relied on later.

What to check before buying a plot

• The zoning and the permitted coverage.
• Whether there is protection, restriction or a planned regulation line.
• Availability of utilities.
• Ground conditions — not revealed by the code, but they strongly affect the cost of the foundations. Ground investigation report.

The point

The local code is not a constraint but a starting point. Know it and you design at the edge of what is possible; ignore it and you design again afterwards.