House construction costs in France: ratios per m², comparison and budget risks

The first confusion in a house budget is believing the price quoted is the total. Whether through a package builder or an architect, the construction price covers the building work, not the whole project.

• Generally included: structure, finishing trades, internal technical equipment (heating, electrics, plumbing), internal finishes to the specification level chosen.
• Often excluded: earthworks and special foundations where the ground requires them, external works and utility connections from the boundary, external landscaping (fencing, gates, terrace, pool), design fees, and administrative costs such as the planning application, insurance and warranties.

A complete house budget takes in all of these. The total cost, excluding land, is generally 15 to 25 % above the construction price quoted.

The total budget of a house

Construction price: 100 %

External works and utility connections: + 3 to 10 %, highly variable with distance from the networks

Earthworks and special foundations: + 0 to 8 %, according to the ground survey

External landscaping: + 5 to 15 % according to ambition, terrace, fencing, garden

Architect's fees where applicable: + 8 to 12 % of the works

Structural warranty insurance: + 1 to 2 %

Total budget excluding land = construction price × 1.17 to 1.47

The ratios below are per square metre of habitable area and cover the building works strictly, excluding external works, landscaping and fees.

Area / route	Package builder	Architect, standard	Architect, high-end	Low-energy house
Provincial, untight markets	1,430 – 1,730 €/m²	1,630 – 2,240 €/m²	2,240 – 3,270 €/m²	1,840 – 2,450 €/m²
Regional cities	1,530 – 1,940 €/m²	1,840 – 2,550 €/m²	2,550 – 3,570 €/m²	2,040 – 2,650 €/m²
Paris region	1,840 – 2,350 €/m²	2,240 – 3,270 €/m²	3,270 – 5,100 €/m²	2,450 – 3,270 €/m²
Mediterranean coast	1,730 – 2,240 €/m²	2,040 – 3,060 €/m²	3,060 – 5,100 €/m²	2,240 – 3,060 €/m²
Remote rural areas	1,330 – 1,630 €/m²	1,530 – 2,040 €/m²	2,040 – 2,860 €/m²	1,730 – 2,240 €/m²
Overseas territories	2,040 – 2,860 €/m²	2,550 – 3,880 €/m²	3,570 – 6,100 €/m²	2,860 – 4,080 €/m²

Note: the package-builder ratios correspond to a catalogue house with standard options. The last column reflects the premium arising from the current thermal and carbon regulations, mainly through the heating system, a heat pump or equivalent, and a reinforced envelope.

Popular intuition says two storeys cost less than a bungalow for the same area, since the footprint and therefore the foundations and roof are halved. That is true in theory, but the real gap is often smaller than expected and can even reverse.

• Economic advantages of two storeys: foundations over half the area, a saving of 3 to 6 %; roof over half the area, a saving of 3 to 5 %; and a smaller plot required, potentially a significant saving on land.
• Premiums of two storeys: an internal staircase, 3,000 to 8,000 € according to material; an intermediate floor, concrete or timber, at 100 to 150 €/m²; acoustic insulation between levels; and possibly a stairwell requiring ventilation.

Net balance: on a standard house of 120 m² habitable, two storeys is generally 3 to 7 % cheaper than a bungalow at the same area and specification. That gap narrows if the land is cheap, the principal advantage of building upward is in the land, not the construction.

The real criterion: usable area

On one level, 100 % of the area is reachable without stairs, an advantage for families with young children or anyone with reduced mobility, and for resale value, where a bungalow commands a premium of 3 to 8 % in some areas.

In a compact two-storey house, converted roof space can add 20 to 30 m² at the same structural cost, a notable advantage in area.

Criterion	Package builder	Architect with individual contractors
Construction price	Fixed contractual price under the statutory house-building contract	An estimate, then tender; the final price after award
Customisation	A limited catalogue, options charged	Bespoke design, complete freedom
Guarantees	Statutory guarantee of price and programme	Statutory warranties: completion, two-year, ten-year
Site supervision	The builder is both designer and contractor	The architect is a designer independent of the contractors
Design fees	Included in the contract price	+ 8 to 12 % of the works cost
Average duration	10 – 14 months to handover	14 – 20 months: design, tender, construction
Recourse in dispute	A single contractor, clear liability	Recourse package by package, more complex
Quality of the work	Catalogue standard, variable by builder	Controlled by the architect, more robust
Total budget with fees	As signed, plus any changes	Works plus 8–12 % architect's fees plus contingency

Comparing headline prices misleads: a package builder at 1,630 €/m² all in, and an architect at 1,840 €/m² before fees, are not comparable. Adding 10 % of architect's fees to the second gives 2,020 €/m², that is 23 % more. The gap is justified by architectural freedom, the quality of site supervision and the absence of any conflict of interest between designer and contractor. The question is not which is cheaper but what value the difference buys.

Post-completion studies show that overruns on individual houses have recurrent causes. Here they are, by frequency and impact.

Risk	Frequency	Budget effect	How to anticipate it
Special foundations: clay soil, made ground, sloping site	Frequent	+ 10,000 to 50,000 €	A ground survey before the planning application, 1,500 to 3,000 €
External works far from the networks, isolated plot	Frequent in rural areas	+ 5,000 to 40,000 €	Request an operational planning certificate
Overrun through changes during construction	Very frequent	+ 5 to 15 % of the contract	Limit changes once work has started
Site slope above 5 %	Moderate	+ 8,000 to 30,000 €	Price earthworks and retaining specifically from the outline stage
Off-mains drainage	Frequent outside urban areas	+ 8,000 to 20,000 €	A drainage percolation survey before buying
Premium from the current thermal regulations	Systematic since 2022	+ 5 to 10 % over the previous standard	Build it into the budget from the start; it cannot be avoided
Changes of brief during design	Very frequent	+ 3 to 8 % per cycle	Freeze the brief before commissioning the drawings
Weather and site delays	Moderate	+ 1 to 4 months, indirect costs	A delay damages clause in the contracts

The ground survey: the most profitable investment available

A pre-design geotechnical survey costs between 1,500 and 3,500 €. It reveals the characteristics of the ground, the foundation depth required and the risks of clay shrinkage and swelling.

Without one, the builder or architect must allow for standard foundations in the quotation and price special foundations as additional work if the ground proves unfavourable. That mechanism exposes the client to unprovided costs of 15,000 to 50,000 €.

Since 2018 the survey has been mandatory for plots in clay areas of medium and high risk under the national mapping. Outside those areas it remains strongly advisable.

Since 1 January 2022 every new house is subject to the French environmental regulations. They introduce two new constraints over the previous thermal standard: a reinforced energy performance requirement, with primary energy demand cut by 30 %, and a carbon performance requirement covering emissions from materials and from energy.

• Effect on the heating system: oil and gas are penalised by the carbon assessment. Almost all new houses are now fitted with an air-source heat pump, a premium of 3,000 to 8,000 € over a gas boiler.
• Effect on the envelope: reinforced insulation with greater thicknesses and thermal bridges treated, triple glazing in cold regions, a premium of 3,000 to 8,000 € over the previous standard.
• Effect on materials: the regulations favour bio-based materials, timber, straw, hemp, whose carbon footprint is lower than concrete, and can change the constructional choices and their costs.

In total the premium over a house built to the previous standard is estimated at 5 to 10 % of the construction cost, amply recovered over 10 to 15 years through heating savings.

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The cost of building a house runs from 1,330 €/m² of habitable area through a package builder in a rural area to more than 5,100 €/m² for a high-end architect-designed house in the Paris region or on the Mediterranean coast. The total budget, excluding land, is 17 to 47 % above the construction price quoted once external works, landscaping and fees are added. Two storeys is structurally cheaper than one for the same area, by 3 to 7 %, but most of the economic advantage lies in the land. The three most frequent risk items are special foundations, best anticipated with a ground survey; external works on an isolated plot; and changes during construction. The current regulations add 5 to 10 %, unavoidable on any new house since 2022.

Reference basis of the figures

These bands are orders of magnitude for framing, and their reference market is the Paris region. They serve to place a budget at the earliest stages and to compare building types with one another. They replace neither a tender exercise nor an estimate prepared on drawings, and they are not a record of prices actually charged.

The ratios per square metre and per item on this page are stated in January 2026 values. They were updated from January 2025 values, the basis adopted for the whole cocoon, using the BT01 all-trades index published monthly by INSEE on its 2010 base: 132.0 in January 2025, 134.7 in January 2026, a rise of about 2 %.

The global amounts quoted as examples, and any rents, charges or receipts expressed per year or per night, remain on their own basis: a building cost index does not apply to them.

To bring the ratios forward, apply the usual revision formula: updated value = page value × (BT01 for the month in question / 134.7). The index has kept rising since: it stood at 138,3 in June 2026, the last value published when this page was checked, that is 2,7 % above the reference base. BT01 measures contractors' input costs, wages and social charges, materials, plant and energy, not the prices actually tendered.