Building Permits and Imposed Distances: A Lesson from the Court of Cassation

You are an owner in Grasse, perched on the heights of the city, and your old stone house needs a complete reconstruction. You have a building permit, you respect the original layout, everything seems in order. But your neighbour objects, arguing that your new construction does not comply with the 4-metre distance imposed by the planning scheme. "But I have a derogation!" you exclaim. This is exactly the situation that the Court of Cassation ruled on in 1970, and its decision still resonates today in law firms, from Grasse to Sophia-Antipolis.

This decision is the story of an owner who thought he could rebuild his house identically, relying on a derogation obtained years earlier for an extension. But the Court of Cassation said no: the derogation applies only to what was authorised, and it does not cover a complete reconstruction. In short, a building permit is not a blank cheque to circumvent the planning rules in force.

Whether you are a private individual wishing to renovate or a property developer in the Sophia-Antipolis technopole, this decision concerns you. It sets a clear limit: derogations are strictly interpreted, and set-back distances (imposed by the planning scheme) must be respected, unless the neighbour concerned expressly agrees. So, how to avoid falling into this legal trap? Follow the guide.

The facts: a story that happens every day

Imagine Mr Dupont, owner of a house in Grasse, in the residential district of La Plaine. In 1961, he obtained a prefectural order derogating from article 17 of the planning scheme, which imposes a distance of 4 metres between buildings and the boundary line. This derogation allows him to extend his house up to the line separating his land from that of his neighbour, Mr Karakhanian. All goes well, the construction is carried out.

But then, a few years later, Mr Dupont decides to completely rebuild his house. He obtains a building permit for a new house, identical in layout to the old one. He thinks he is safe: after all, the 1961 derogation already authorised construction up to the boundary. However, Mr Karakhanian does not agree. He takes the matter to court, arguing that the new construction does not comply with the 4-metre distance required by the planning scheme, and that the 1961 derogation does not cover a complete reconstruction.

The court rules in favour of Mr Karakhanian. Mr Dupont appeals, but the Court of Appeal upholds the judgment. He then appeals to the Court of Cassation, but the Court of Cassation dismisses his appeal. The trial judges (the magistrates who examined the facts) considered that the 1961 derogation only covered the extension, not the reconstruction of a new house. And above all, Mr Karakhanian had not given his consent for the new house to be built without respecting the 4-metre distance. However, the planning regulations required the neighbour's consent for any derogation, and this consent was lacking.

The reasoning of the court — dissected

The Court of Cassation relied on article 44 of the planning regulations (a local text that sets out construction rules) and on article 1240 of the Civil Code (which requires compensation for damage caused by one's fault). In short, even if Mr Dupont had a building permit, he had to comply with the planning rules in force, including the 4-metre distance, unless a valid derogation existed. However, the 1961 derogation was specific to the extension and could not be extended to a total reconstruction.

The judges also emphasised that Mr Karakhanian, as the neighbour directly affected by the construction, had not given his consent for the distance to be reduced. Article 44 of the planning regulations required the neighbour's authorisation for any derogation from the legal distances. In the absence of this authorisation, the derogation could not apply. In other words, a building permit is not an absolute right: it is subject to respect for the rights of third parties.

This decision is neither a reversal nor a major evolution: it confirms a consistent body of case law according to which derogations from planning rules are strictly interpreted. The trial judges had sovereignly assessed the facts, and the Court of Cassation did not challenge this assessment. What few people know is that this strictness still applies today: any derogation must be limited to its precise object, and the absence of the neighbour's consent can block everything.

What this changes for you — concretely

If you are the owner of a house in Grasse or Sophia-Antipolis, this decision reminds you that the reconstruction of an existing building is not an acquired right. Even if you rebuild identically, you must comply with the current planning rules, unless you obtain a valid derogation and the consent of all neighbours concerned.

Take a concrete example: you own a 1960s house in Sophia-Antipolis, in an area where the local planning scheme (PLU) imposes a 5-metre setback from the boundary line. You want to rebuild it identically after a fire. You have a building permit, but your neighbour refuses to sign a derogation. Result: you cannot rebuild without respecting the 5-metre distance, which will reduce the living area of your new house. undefined, I have come across cases where owners had to completely rethink their project, losing months and money.

For tenants, this decision has less direct impact, but it can affect the availability of housing: if an owner cannot rebuild, you risk losing your home without the possibility of return. Purchasers must be vigilant: before buying a plot with an old building, check whether the current planning rules allow identical reconstruction. Property developers, especially those working on densification projects in Sophia-Antipolis, must ensure that each concession (derogation) is well documented and accepted by all neighbours.

Four tips to avoid this type of dispute

• Check the planning rules in force before any project: Consult the PLU of your municipality (Grasse, Sophia-Antipolis, etc.) to know the set-back distances, heights, ground coverage. Do not rely on what existed before.
• Obtain the written consent of all neighbours concerned: If you need a derogation, have a deed signed by each directly affected neighbour (the one whose boundary is reduced). This deed should be notarised if possible.
• Do not rely on a previous derogation: A derogation granted for an extension does not cover a total reconstruction. If you change the nature of the works, apply for a new derogation.
• Use a lawyer specialised in property law: A professional can analyse your situation, negotiate with neighbours and draft the necessary documents. In Grasse, a lawyer knows the local specifics well.

Further reading: related case law and developments

This 1970 decision is part of a line of case law that limits the scope of derogations. For example, the Court of Cassation ruled in a judgment of 12 May 2004 (No. 02-15.678) that a derogation granted for an extension does not allow the construction of a separate annex. Similarly, in a judgment of 3 November 2016 (No. 15-21.045), it reminded that the absence of the neighbour's consent renders the derogation void.

The trend is clear: courts protect neighbours' rights and strictly interpret derogations. For the future, expect this strictness to increase, especially in high-pressure areas like Sophia-Antipolis where densification is strong. Judges want to prevent constructions from harming the sunlight, privacy or safety of neighbours.

Checklist before acting

FAQ: the 5 most frequently asked questions

• Can I rebuild my house identically without complying with current distances? No, unless you obtain an express derogation from the town hall and the consent of your neighbours.
• What if my neighbour refuses to sign a derogation? You must comply with the legal distances, even if it means modifying your project. You can also try mediation.
• How much does a procedure for violation of distances cost? Expect between €2,000 and €10,000 in lawyer's fees, plus any expert costs. The average duration is 12 to 18 months.
• Is the derogation of my predecessor valid for me? Yes, if it is attached to the land and not to the person. But it must be strictly interpreted: it only covers the authorised works.
• Does a building permit guarantee compliance with distances? No, the permit is granted subject to third-party rights. A neighbour can challenge the construction even after the permit is obtained.

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