What each part contains
The graphic part locates. It shows the division into zones, boundaries, particular perimeters and elements identified across the territory.
The written part prescribes. It sets out the rules applying to each zone, defines the terms used and fixes the numerical values.
Neither contains the full information. The graphic part says where, the written part says what, and meaning arises only from cross-reading the two.
Particular plans for new districts also include a justifying report, setting out intentions and often making the spirit of the provisions intelligible.
| Part | What it carries | How to read it |
|---|---|---|
| Written part | The binding rules and definitions | It governs interpretation |
| Graphic part | Boundaries, zones and building lines | It locates the plot |
| Combined reading | The applicable result | The two are read together |
Why neither reads alone
Three practical reasons.
A graphic marking without a written rule says nothing of its effect. A perimeter shown on a plan may correspond to a strong constraint or a mere indication, depending on what the text says.
A written rule without location does not say whether it applies. Provisions attach to zones, and the graphic part is needed to know which zone the plot falls in.
The definitions sit in the written part. The technical terms used are defined there, and those definitions condition every calculation, as the article on the parameters limiting volume shows.
The cross-reading method
Five steps, in this order.
Locate the plot on the graphic part and note the zone it falls in.
Note every marking that concerns it, perimeters, alignments, protected elements or constraints shown.
Find in the written part the provisions attaching to that zone.
Find the provisions attaching to each marking noted, which add to the previous ones.
Check the definitions of the terms used before any calculation, these being specific to the document consulted.
Step four is the most often skipped, although it frequently carries the strongest constraints.
Handling apparent contradictions
A point that disconcerts occasional readers. The written and graphic parts are read together.
An apparent contradiction between the two parts is most often a reading error, one showing what the other defines differently.
A real contradiction falls to the municipality's interpretation, as the competent authority.
Do not settle it yourself. Adopting the reading most favourable to your project is the surest way to a late refusal, after design costs have been incurred.
Have the question put in writing and keep the answer, which protects in the event of later divergence.
Practical precautions
Four often neglected points.
Check the date and version of each part consulted, the two needing to match.
Check the scale of the graphic part before taking any measurement from the plan.
Do not measure on an undimensioned extract to infer a boundary, an extract serving to locate rather than to measure.
Obtain the complete document rather than an extract, extracts frequently omitting the general provisions.
What this means for a professional
Four rules.
Always obtain both parts, and refuse to conclude on one alone.
Note graphic markings one by one and find the corresponding provision for each.
Check definitions before calculations, these varying between documents.
Have any reading confirmed in writing where it conditions a commitment.
This article reflects the regulatory framework at the date of checking and serves professional orientation. It does not replace consultation of the municipality or legal advice.