How much can buildings actually save on charges? Evidence from 51,000 French copropriétés

Most co-owners pay their quarterly charges and never think about them again. The annual statement arrives as a dense document, few people read it, and fewer still question whether the building is getting a fair deal on its contracts. But the data from France — where co-ownership is the most studied and regulated in Europe — shows that buildings which actively review their expenses save real money.

This article collects the best available evidence: large-scale observatory data, consumer group benchmarks, platform claims, and documented case studies. The goal is simple: to answer the question "how much can a building realistically save?" with numbers, not marketing.

Foncia: 5–10% across 51,000 buildings

Foncia is France's largest property manager, overseeing 51,000 copropriétés and 1.5 million lots. Their annual charges observatory, published in April 2026, is the most authoritative large-scale dataset on co-ownership costs in Europe.

The headline finding: national average charges were €1,488 per lot per year, down 0.8% from 2024. But the more interesting claim is Foncia's own statement that active management of controllable expense categories delivers 5 to 10% savings.

What are "controllable expenses"? Everything that isn't a pass-through utility cost or government tax: elevator maintenance, cleaning, insurance, syndic fees, landscaping, security, and general building upkeep. These typically represent 40–60% of total charges. A 5–10% reduction on controllable items translates to roughly 2–6% on the total budget — or €30–90 per lot per year.

For a 60-unit building with €120,000 in annual charges, that's €2,400–7,200 per year back to residents.

ARC/OSCAR: 15–30% in never-optimised buildings

The ARC (Association des Responsables de Copropriété) is France's main consumer group for co-ownership. Their OSCAR+ benchmarking tool lets conseil syndical members compare their building's costs against a panel of similar properties.

ARC's published claim: using OSCAR+ and related tools can reduce overall charges by 15 to 30% in buildings where no prior cost management plan had been implemented. This is a higher figure than Foncia's because it captures the gap between an entirely passive building and one that starts scrutinising every contract.

The case studies are specific:

Elevator maintenance: 44% savings

A building in Saint-Denis with three elevators was paying €13,200 per year (€4,400 per unit). After competitive tendering via ARC's network, the contract dropped to €7,350 per year (€2,450 per unit) — a saving of €5,850 annually.

Insurance: 50% savings

A Paris building's multirisque immeuble (MRI) insurance went from €16,350 to €8,100 per year after re-tendering — a 50% reduction. This is not unusual: Bellman, a French PropTech company specialising in charge optimisation, reports an average saving of €1,105 per building per year on insurance alone, with a range from 3% to 61%.

Bellman also found that 20% of buildings had measurement errors averaging 27% of insured surface area. Many buildings overpay simply because nobody ever checked whether the declared square footage matched reality.

Heating contract: 18% savings

One of ARC's most detailed case studies documents a conseil syndical member at a 200-unit building near Paris who spent two years renegotiating a P1 heating contract with Cofely (now Engie). Using ARC's COPRO-GAZ platform to obtain competing quotes, the building achieved an 18.2% reduction on heating gas and a 10% adjustment on hot water. For 200 households, this represents thousands of euros per year.

What PropTech platforms claim

Several French platforms publish savings figures, though these should be read with appropriate scepticism:

Matera (3,000+ copropriétés, cooperative model) claims 30% average savings on charges. However, this figure conflates the elimination of professional syndic fees with operational charge reductions. The pure operational savings — contracts, energy, insurance — are closer to 10–20%.

Cotoit reports 10–20% savings on re-tendered contracts. 123Syndic, which operates a courtier model (paid on savings achieved), claims 15–25% on major charge items and up to 65% on individual contracts. Manda's barometer shows their managed portfolio significantly outperforming the national average on charge increases.

Contract-by-contract breakdown

Aggregating across ARC, Cotoit, Baticopro, 123Syndic, and Bellman, here is the realistic savings range for each major contract type when competitively re-tendered:

Elevator maintenance (5–8% of total charges): 30–50% savings possible. Insurance (8–12% of charges): 15–40% savings. Cleaning (15–20% of charges): 10–20% savings. Heating and energy (25–34% of charges): 18–30% from contract renegotiation, up to 50% with renovation. Electricity for common areas (3–5% of charges): 5–10% from supplier switching, 30% from LED upgrades and motion sensors. Syndic fees (15–25% of charges): 20–40% from competitive tendering or switching to an online platform.

What this means for Luxembourg

Luxembourg has no equivalent of Foncia's observatory or ARC's OSCAR tool. The co-ownership market is dominated by a handful of syndics with no public price comparison data. The transparency gap is even wider than in France.

But the cost structures are similar — the same types of contracts (elevator, cleaning, insurance, heating) make up the same proportion of charges. Luxembourg's postal rates for registered mail are actually higher than France's (€10 per letter vs. €7–8). And with no statutory requirement for a syndic extranet or financial transparency portal, most Luxembourg co-owners have even less visibility into their building's spending than their French counterparts.

The conservative conclusion: a Luxembourg building that has never systematically reviewed its contracts can almost certainly find 5% in savings. An actively managed building with competitive tendering and regular contract review can likely achieve 10–20%.

For a 60-unit building with €120,000 in annual charges, 5% means €6,000 per year — or €100 per household. That's not a marketing promise. It's what happens when residents can actually see where their money goes.

Sources: Foncia Observatoire des charges 2026; ARC/UNARC OSCAR+; Bellman charge optimisation reports; Cotoit guides; Baticopro contract renegotiation data; 123Syndic methodology; Manda barometer.