Selling or partnering your building engineering consultancy in France: building engineering enters the era of groups

A French technical engineering consultancy (bureau d'études techniques, BET) was long handed on in the quietest possible way: the founder gradually sold their shares to one or two in-house engineers, and the client base of architects, developers and local authorities followed without noticing. This model still exists, but it is no longer the only one. Over the past ten years, large engineering groups have been completing their regional networks by taking over consultancies of twenty, fifty or a hundred people, while investment funds finance combinations of specialist firms.

This comes as private-sector commissioning is going through a difficult period and renovation and decarbonisation are shifting the profession's centre of gravity. Structure, building services, energy, environment, cost consulting, client-side project management and building digitalisation now meet on the same projects, and this convergence pushes players to broaden their range, through recruitment or acquisition. For the partners of a consultancy, it widens the options, but it also requires them to look at their company through a buyer's eyes.

A sector of 31,500 companies, dominated by micro-businesses and SMEs

According to the industry federation Syntec-Ingénierie, French engineering represents €62 billion in revenue and 387,800 employees, split roughly evenly between construction and industry. ¹ The sector has 31,500 companies, 80% of them micro-businesses and SMEs. ¹ The building branch is therefore made up of a handful of national groups, a few dozen regional players and thousands of firms of five to forty people organised around one or two founding partners. The branch's joint observatory OPIIEC confirms this profile of a skills-based sector where most building supply remains SMEs and specialist firms, which multiplies opportunities for combinations between complementary disciplines. ²

The recent economic picture is mixed. The barometer published by Syntec-Ingénierie in November 2025 shows that 47% of groups active in building saw revenue fall in 2025 and 79% report a decline in their order book. ³ The average order book covers nine months of activity, but only six months for companies with fewer than 100 employees, against twelve for the largest. Small firms are the most exposed: 43% of those with fewer than 100 employees saw activity fall, against 18% of groups with more than 500. ³ This gap partly explains why size has become an issue. Underlying demand nonetheless remains supported by energy renovation, the complexity of standards, decarbonisation of the building stock, climate adaptation and digital design. It is small firms, not the need for engineering, that are weakened.

The drivers of consolidation

Partner demographics. Many regional consultancies were founded in the 1980s and 1990s by engineers now close to retirement. Internal succession runs up against higher prices than in the past, the equity contribution banks require and the limited appetite of a generation that does not always want to carry sole responsibility for a company.
Growing technical complexity of projects. Clients look for teams able to handle several disciplines and coordinate complex projects where thermal, structure, acoustics, environment and cost consulting intertwine. Bringing these skills under one roof is faster through acquisition than recruitment.
Environmental regulation. The RE2020 building regulation and its 2025, 2028 and 2031 milestones progressively tighten carbon requirements for new buildings, and the tertiary energy saving scheme (éco-énergie tertiaire) requires offices and shops to cut their consumption progressively until 2050. Buildings are among the leading greenhouse gas emitting sectors in France: renovation and decarbonisation of the existing stock are becoming an engineering market in their own right, requiring skills in thermal engineering and life-cycle analysis.
The engineer shortage. Institut Montaigne estimated in May 2025 that France will need to fill nearly 100,000 additional engineer and technician posts a year until 2035. ⁴ In building, where salaries remain lower than in industry and digital, small consultancies struggle to recruit and retain. Groups offer career paths and large projects.
Digital and BIM. Digital models, dynamic thermal simulation, first uses of artificial intelligence for written documents: investment in software and training has grown heavier, and clients demand BIM deliverables that under-equipped firms struggle to produce at the right cost.
The need for size facing major clients. Large developers, property companies and social landlords concentrate their commissions on teams able to cover all technical packages in several regions. The single-specialist consultancy remains valuable, but is increasingly brought in as a co-contractor in a larger team. National clients also value firms able to follow projects in several regions with consistent methods and deliverables.

Who buys engineering consultancies today

National and international engineering groups. They pursue a continuous acquisition strategy to densify their regional presence and complete their expertise. Artelia, 100% owned by its managers and employees, took over building and infrastructure engineering companies in Australia, Iceland and continental Europe in 2025. ⁵ Other large French groups do the same, often with firms of twenty to fifty people whose founder is seeking an exit, as Ingérop did as early as 2015 with a Lille building consultancy. ⁶
Fund-backed platforms. Attracted by the recurrence of design and supervision assignments, the sector's fragmentation and demand linked to energy renovation, funds are building regional or thematic groups by successively buying consultancies whose owners remain partners.
Real estate and construction players. Commercial property advisers, general contractors, energy companies and technical services groups integrate engineering, client-side project management or regulatory expertise to control the renovation value chain. JLL's acquisition of the building services consultancy CTH in 2016 illustrates a trend that has since been confirmed. ⁷
International players. European and North American engineering or technical services groups use the acquisition of a regional consultancy as an entry point or reinforcement in France, particularly when it holds a recognised specialty or complex references.
Growing peers. Combining two complementary consultancies in the same region, structure and building services for example, remains the most frequent route for firms with fewer than twenty people.

An engineering company's capital can be freely transferred, and no professional order regulates share ownership, unlike architecture. A change of control does require anticipating the OPQIBI qualifications attached to the company and its designated experts, professional and ten-year liability insurance, current public contracts and design team groupings. Nothing blocking, but these issues determine the timetable.

What this changes for the partners of a consultancy

A full sale suits partners close to retirement, with a transition of six months to two years to hand over relationships with architects and clients.
A partnership with reinvestment is for owners, whatever their age, who still have several years of activity ahead and sell a majority or minority to a group or platform, reinvest part of the price in the top holding and continue to grow with greater resources, sharing in the next capital gain.
A combination between peers creates a multidisciplinary regional player, able to bid alone for larger contracts and organise succession between partners without an outside investor.
A capital reorganisation such as an OBO lets the founder secure part of their wealth and bring in the project managers who will carry the company, with bank debt or a minority investor.

Whatever the structure, buyers first want to check that skills, references and client relationships belong to the organisation as a whole. In a trade where value rests on people, the same criteria come up in every analysis.

Quality of the client and referrer portfolio. Split between public and private, new build and renovation, fee concentration, loyalty of architects and clients, ability to win new projects. A diversified, recurring client base is worth more than one large developer.
Differentiating skills. Rare expertise, complex references, positioning in growing segments such as heavy renovation, life-cycle analysis or summer comfort: a recognised technical niche increases strategic interest, even for a modest-sized firm.
The team and skills pyramid. Project managers and managers who carry projects and client relationships, a demonstrated ability to recruit and retain engineers, controlled turnover: this is what the buyer purchases first, and an already delegated organisation adds value.
Order book and sales pipeline. Visibility on signed studies, contracts being awarded and design team groupings gives a view of the next twelve to eighteen months.
Project management. Time tracking, utilisation, margin per assignment, control of overruns and billing of variations must be reliable. A consultancy that knows its margin assignment by assignment sells far better than one that only discovers it in the balance sheet.
Qualifications and references. OPQIBI qualifications attached to the company and its experts, references documented by building type, BIM tools and methods: they determine access to public contracts and large clients.
Claims and ongoing assignments. History of claims, professional and ten-year liability insurance and the progress of ongoing assignments are examined during due diligence and determine the scope of warranties requested from the seller.

You are thinking of selling: is this the right moment for you?

This is the first question we ask, and the answer is not the same for everyone. The right moment is never automatically "right now", even in a market with many buyers. It depends on two things: you, meaning your life plans, personal horizon and wealth objectives, and your consultancy, meaning its ability to realise today all the value it holds. We encounter two situations.

Your consultancy is almost ready. The order book is full and diversified, project managers are stable, qualifications are up to date, margin holds, or your firm has a recognised specialty that makes it attractive despite its modest size. Or you want your firm to become part of a larger project, that of a large group, often under LBO, that brings the tools, expertise and resources to absorb the profession's regulatory and digital changes, which is reassuring for you and for your teams. A few weeks of preparation are then enough to go to market, and the number of buyers, rarely so high, works in your favour.
Your consultancy needs time. One developer or architect represents too large a share of fees, a claim or a loss-making assignment weighed on the last year, activity still relies mainly on new build while demand has shifted to renovation. Selling remains possible, but it means accepting a discount. We will then tell you frankly that it is better to spend several months, sometimes a few years, working on these points, and we can support you through that phase before launching the transaction when you are truly ready.

The workstreams that make the difference are well known: diversify referrers, develop renovation and decarbonisation assignments, make time tracking and margin per project reliable, document the order book and references, update qualifications, bring in or retain project managers and delegate part of the client relationship, present readable accounts. It also helps to state clearly what your consultancy would bring a buyer: new geographies, complementary specialties, access to larger tenders, shared tools. Depending on your starting point, these workstreams take a few weeks or a few years.

The benefit of talking early, even without being sure you want to sell, is precisely knowing which of these two situations you are in, and deciding with full knowledge rather than under pressure.

Facing groups that complete several acquisitions a year with dedicated teams, partners negotiating alone are rarely on an equal footing. The value of an engineering company is not just a headline figure: it depends on the buyer's plan, the price structure, the portion conditional on future results, the share reinvested, the warranties requested on ongoing assignments, the future of the teams and the length of your transition. Two offers at the same headline price can mean very different things.

The role of an independent M&A adviser is to value the consultancy objectively, identify all relevant buyers, put them in competition in a structured and confidential process, and negotiate terms beyond price alone. This competition protects the seller: it lets them compare genuinely different projects and choose the one that fits their objectives and their teams.

Frequently asked questions

Why are building engineering consultancies combining?

Building consultancies combine to bring together complementary skills, structure, building services, thermal, acoustics, environment, on the same projects, to reach the size large clients demand, to cover several regions with consistent methods and to respond to engineer recruitment pressures. The retirement of a generation of founders and the cost of digital tools such as BIM are accelerating the movement.

Who buys building engineering consultancies today?

Four families of buyers are active: national and international engineering groups densifying their regional presence and completing their expertise; fund-backed platforms combining complementary consultancies while keeping owners as partners; real estate, construction and technical services players integrating engineering skills; and growing peers, the most frequent route below twenty people.

Does a highly specialised or small consultancy interest a group?

Yes. A recognised technical niche, acoustics, dynamic thermal modelling, timber structures, life-cycle analysis or heavy renovation, may precisely interest a group wanting to complete its offer, and the scarcity of certain skills creates strong strategic interest even for a firm of ten or fifteen people. The condition is that the skill and references are carried by the team and documented.

Is an authorisation or approval needed to sell an engineering consultancy?

No. An engineering company's capital can be freely transferred and no professional order regulates its ownership, unlike architecture. A change of control does require anticipating the OPQIBI qualifications attached to the company and its experts, professional and ten-year liability insurance, current public contracts and design team groupings. Nothing blocking, but these issues determine the timetable.

Can you sell your consultancy and remain a partner?

It is the most common structure with platforms and many groups: partners sell a majority or minority, reinvest part of the price in the top holding and continue to grow with greater resources, sharing in the capital gain at the next sale. It suits owners, whatever their age, who still have several years of activity ahead and want to secure part of their wealth without stopping. The future role and exit terms are negotiated in the shareholders' agreement.

How long does it take to sell an engineering consultancy?

Once the process is launched, allow six to twelve months between preparing the file and signing: memorandum and data room, confidential approach to buyers, indicative offers, meetings, binding offers, then accounting, legal, employment and technical due diligence under exclusivity. Ongoing assignments and ten-year liability often lengthen due diligence. Several months of upstream preparation significantly shorten this timeline.

Which indicators should you prepare before talking to buyers?

Buyers first ask for the order book and sales pipeline, team utilisation, margin by project and assignment type, fee concentration by client and referrer, the split between new build and renovation and between public and private, turnover and recruitment, the contribution of the main areas of expertise and claims history. Having these indicators reliably over three years saves time and adds value.

Why put several buyers in competition to sell your consultancy?

Engineering groups and platforms complete several acquisitions a year with dedicated teams; partners talking to only one of them have neither a point of comparison nor leverage. A confidential process that puts national groups, platforms, real estate players and peers in competition allows prices to be compared, but also projects: autonomy left to the consultancy, share reinvested, career paths for engineers, warranties requested.

Public sources consulted

Syntec-Ingénierie, Rapport d'activité 2025 : chiffres clés de l'ingénierie française (juin 2026) : https://www.syntec-ingenierie.fr/app/uploads/2026/06/SYNTEC-INGENIERIE_RAPPORT-DACTIVITE-2025.pdf (high reliability)
OPIIEC, Ingénierie : les chiffres de la branche, la cartographie des métiers et les études publiées : https://opiiec.fr/secteur/ingenierie (high reliability)
Syntec-Ingénierie et Quadrat, Baromètre économique de l'ingénierie, synthèse (novembre 2025) : https://www.syntec-ingenierie.fr/app/uploads/2025/12/Quadrat_Syntec_Ingenierie_BarometreEco_Synthese_Version_2_pages48.pdf (high reliability)
Institut Montaigne, Métiers de l'ingénieur : démultiplier nos ambitions, résumé (mai 2025) : https://institutmontaigne.org/ressources/pdfs/publications/resume-metiers-de-lingenieur-demultiplier-nos-ambitions.pdf (good reliability)
Artelia, Espace presse : acquisitions de LCI, HNIT et Erregi (2025) : https://arteliagroup.com/fr/categorie/presse (good reliability)
CFNews, ETR Ingénierie se construit chez un groupe national, reprise par Ingérop (22 avril 2015) : https://www.cfnews.net/L-actualite/M-A-Corporate/Operations/100/ETR-Ingenierie-se-construit-chez-un-groupe-national-196967 (good reliability)
JLL France, JLL fait l'acquisition du bureau d'études techniques CTH (mai 2016) : https://www.jll.com/fr-fr/newsroom/jll-fait-acquisition-cth (good reliability)