Why Most Paris Apartment Renovations Go Over Budget — and How to Avoid It

The honest perspective of an interior architect who has seen every scenario

Studio de Beaulieu · February 2026

A compact open kitchen by Boffi, with bold black-and-white granite worktops, premium appliances and open shelving toward the living space — the result of precise space planning and early budget allocation to the elements that matter most. Exactly the kind of decision-making that keeps a Paris apartment renovation on track.

There is a version of this article that lists five neat tips and wraps everything up with reassuring optimism. This is not that article. What follows is a direct and honest account of the real reasons Parisian renovations exceed their budgets — and the specific measures that actually prevent it.

At Studio de Beaulieu, we work with clients who have clear ambitions and finite resources. Our role is not to spend their money — it is to ensure that every euro serves a clear purpose and that the final result is as beautiful as the initial vision. That requires honesty at every stage.

Reason 1: The brief was not specific enough

The most common source of budget overruns is also the least glamorous: vagueness at the outset. A brief that says 'we want something beautiful and modern with a classic touch' gives contractors almost nothing to price accurately. Their quotes will be approximate, and the gap between what was quoted and what was actually expected can be enormous.

The solution is a rigorous pre-project phase: a detailed spatial programme (how many rooms, what functions, what flows), a clear material direction (which finishes, which quality level), and a written design concept that every contractor references. Time invested here is saved, with interest, later.

Reason 2: The building reserved surprises

Haussmannian buildings are magnificent. They are also, by definition, old — and old buildings hold secrets. Behind a wall that appeared perfectly sound, a previous renovation left rerouted pipes. Beneath a floor that looked stable, the original structure was compromised by moisture decades ago. Above a ceiling that showed no signs of distress, the joists were undersized for a planned library.

None of this is predictable from a visual inspection. What is predictable is that surprises will occur — and a client who has not provisioned for them will face either a difficult financial decision mid-project or a compromise to the design.

We systematically recommend a contingency of 10 to 15% of the total works budget. Not as a pessimistic assumption, but as a professional one. A contingency that is not needed becomes a pleasant surplus at the end of a project. A contingency that is missing becomes a crisis.

The question is not whether your Parisian renovation will encounter the unexpected. It will. The question is whether you have the financial structure to absorb it elegantly.

Reason 3: The contractor coordination was underestimated

A full apartment renovation involves multiple distinct trades: structural and masonry, electrical, plumbing, heating, parquet, joinery, painting, marble laying, decoration. Each of these trades operates on its own schedule, with its own supply chain and its own constraints.

When coordination fails — a parquet installer arrives before the plumber has finished, a joinery piece is delivered before the walls are ready to receive it — delays cascade. Delays cost money: contractor mobilisation fees, storage costs, and sometimes the loss of an artisan who has moved to another project.

A dedicated project manager — whether an interior architect or a maître d'œuvre — is not a luxury. It is the mechanism that prevents these cascades. The cost of their involvement is consistently lower than the cost of the delays and errors they prevent.

Reason 4: VAT was overlooked

This is the most common numerical surprise for clients, particularly those coming from outside France. In France, renovation works in existing residential buildings are subject to reduced VAT rates — 10% for most renovation work, 5.5% for energy-efficiency improvements — rather than the standard 20%. However, these rates apply only when conditions are strictly met.

New construction elements, certain fittings, and any work on a property less than two years old may attract the full 20% rate. The difference, on a €400,000 works budget, can represent €40,000 or more. Understanding the VAT implications of your project's scope, from the outset, is essential.

Reason 5: The furniture budget was added too late

This deserves its own mention because it recurs so consistently. The works budget is carefully planned, the contractor contracts are signed, and then — six months before delivery — the reality of furnishing an empty 180m² apartment registers fully. Quality furniture, bespoke textiles, art, and lighting represent a significant investment that must be planned as part of the total project budget from the beginning.

We recommend provisioning 15 to 20% of the total works budget for furnishing and styling. For a project where the architecture is truly distinguished, the furniture must be its equal. A beautifully renovated apartment with furniture that does not rise to its level is an incomplete project.

The alternative: a project that stays on course

The antidote to all of the above is not caution — it is rigour. A precise brief, a well-structured contingency, experienced contractor coordination, complete budget visibility from the first conversation, and an aesthetic commitment that does not waver under pressure. This is the kind of project that delivers exactly what was envisioned — and sometimes more.

Would you like to discuss the structure of your renovation budget before you begin? Studio de Beaulieu offers honest, confidential conversations for projects from €2,000/m².

We'd love to hear about your project. Contact Studio de Beaulieu.