One market to sell into, three to build in
“Benelux” is a useful word for a region and a misleading one for a project. Belgium, the Netherlands and Luxembourg are close enough that the same house design travels comfortably between them, and they sit inside the single market, so the modules move as goods with no border formalities. Everything after that diverges: who grants permission, what they assess, which document proves the house complies, and who carries the liability when it does not.
The practical consequence is that a supplier who says “we build in the Benelux” and offers you one procedure has not built there. What we hold constant is the architecture, the factory and the team you talk to. What gets rebuilt for every project is the compliance package — and in Belgium, that package differs depending on which side of a regional border the plot sits.
Belgium: permission is regional, and so is the energy rule
Belgium has no national planning law. Spatial planning and building energy performance are regional competences, so the procedure depends on whether your plot is in Flanders, Wallonia or the Brussels-Capital Region, while what may be built on it is set by the municipality's own plans and by the regional code above them.
- Flanders. A new dwelling needs an omgevingsvergunning — the integrated environment permit that merged the old planning and environmental consents — filed digitally through the regional Omgevingsloket and decided by the municipality, with a public-inquiry period and an appeal route to the provincial authority.
- Wallonia. A permis d'urbanisme under the Code du Développement Territorial, filed at the commune, with the CoDT setting the procedural deadlines and the communal plans setting what is buildable.
- Brussels-Capital. A permis d'urbanisme / stedenbouwkundige vergunning under the regional planning code, where the density of the built fabric and heritage protection make the design conversation considerably tighter than the regional average.
Two Belgian features matter more to an international client than the procedural detail. The first is the architect obligation: Belgian law requires a registered architect for works subject to a permit, the architect's ten-year liability has to be insured, and since the 2019 reform contractors and other construction professionals must also carry ten-year liability insurance on the closed shell of a dwelling. Ask any supplier to name the insurer, in writing, before you pay a deposit. The second is the soil certificate: transferring land in Flanders requires a soil certificate from the regional soil agency, and Wallonia operates its own soil-information regime — a search that is quick when the ground is clean and a genuine complication when it is not, which is why it belongs in feasibility rather than at the notary's table.
On energy, Belgium works through the EPB framework, applied regionally: Flanders sets an E-level for the dwelling alongside a requirement on the efficiency of the shell itself, Wallonia applies its QZEN nearly-zero-energy requirements, and a reporter appointed for the project files the declaration after completion. All of them are heating-dominated calculations in which airtightness and thermal-bridge-free junctions do most of the work.
The Netherlands: the Omgevingswet, and an independent assessor on your side
Dutch building law changed fundamentally in January 2024, and any guidance written before then is out of date. Two reforms took effect together.
The Omgevingswet replaced the previous permit act and consolidated spatial law into a single system. For a new house this splits the old single permit in two: a spatial-planning consent tested against the municipality's omgevingsplan — the instrument that is progressively replacing the old zoning plans — and a separate assessment of the technical building activity against the national building rules, now codified in the Besluit bouwwerken leefomgeving. Applications go through the national Omgevingsloket, and the municipality remains the authority that decides what your plot allows: footprint, height, position, and in most municipalities an advisory review of the design's quality and fit with its surroundings.
The Wkb — the quality-assurance act — changed who checks that the house actually complies. For a detached dwelling, the municipality no longer performs the technical check; an independent kwaliteitsborger is appointed to verify the works against the rules and report at completion, and occupation follows that report. The contractor also owes you a documented consumer file for the house as built and carries a strengthened liability for defects that were not visible at handover.
That regime suits factory construction unusually well. An assessor's difficulty with a site-built house is that the evidence is transient — a junction is open for an afternoon and then closed forever. Our modules are built, inspected and photographed in sequence in a factory, against a specification that does not change between units, and the resulting record is exactly the documentation the Wkb asks for.
On energy, a new Dutch dwelling is assessed on the three BENG indicators — the energy demand of the envelope, the primary energy use and the renewable share — together with the TOjuli check on summer overheating, and separately on the environmental performance of the materials it is built from. New homes have had no gas connection since 2018, so a heat pump with low-temperature emitters and heat-recovery ventilation is the normal specification rather than an upgrade.
Luxembourg: the commune decides, and the VAT rate is worth knowing
In the Grand Duchy the autorisation de construire is issued by the commune, and what you may build is fixed by two layers of planning: the communal plan d'aménagement général that zones the territory, and the plan d'aménagement particulier that governs the detail of a given development area, down to volumes, alignments, roof form and materials. The permit file is prepared and signed by an authorised architect or engineer, and it is submitted in French or German — neither of which needs to be your problem.
Two points shape a Luxembourg project. On energy, a new dwelling must reach class AAA, documented by an Energiepass: a nearly-zero-energy envelope with renewable-led services, which again rewards a tested, factory-made airtight shell. On tax, Luxembourg operates a super-reduced VAT rate of 3 per cent for the construction of a dwelling used as the owner's principal residence, granted on prior application to the tax administration and capped in the amount of relief, with the standard rate applying to a second home. The saving is material enough that the application belongs in the project plan from the start — and the conditions are specific enough that it has to be confirmed by a Luxembourg adviser, not assumed from a web page.
Structure and climate: Eurocodes with three national annexes
Structural design follows the Eurocodes, with the Belgian, Dutch or Luxembourg national annex as applicable — the same basis as our Spanish work, different values. The climate across the three countries is consistent enough to describe in one paragraph, and it pulls the specification in the opposite direction from our home market.
- Wind, not snow, is the severe action. Snow loads are modest by continental standards; exposure on the North Sea coast, in the Dutch polders and across open Flemish farmland is not, and it governs the frame, the fixings and the module-to-module connections.
- Driving rain is a detailing discipline. Persistent wind-driven rain is the maritime climate's defining problem for an envelope, so the facade is designed as a drained, back-ventilated system with junctions resolved in the factory rather than improvised in the wet.
- Heating demand dominates, but summers no longer forgive. Envelopes are thick and airtight with heat-recovery ventilation; at the same time both the Dutch overheating check and recent summers make shading, glazing selection and night ventilation a design decision rather than an afterthought.
- Soft ground and high water tables reach beyond the Netherlands — coastal Flanders and the river valleys behave much the same way, and the foundation design follows the soil investigation, not a standard detail.
Delivery: no customs, and the last fifty metres
All three countries are in the EU customs union, so a Benelux delivery has no border formalities: the modules travel by road from the factory in Spain through France and arrive as ordinary goods. The distances are moderate and the motorway network is excellent. None of that is where the risk sits.
- The abnormal load needs an authorisation, country by country. A load beyond the legal dimensional or weight envelope travels under an exceptional-transport permit with an approved itinerary and escorts — issued by the federal mobility administration in Belgium, by the RDW in the Netherlands and by the Ponts et Chaussées in Luxembourg, in each case coordinated with the authorities that own the roads on the route.
- Bridges, quays and canals are the real constraint. This is the most densely built group of markets we serve. Load limits on bridges and quay walls, clearances, tram and overhead lines, street trees and medieval street widths do more to determine module size than the length of the journey.
- Craning is a permitted event with a time window. Standing a crane in a built-up street usually means a municipal occupation permit, a traffic plan, sometimes a police escort, and a date. Where the crane can stand and what it can lift at that radius sets the maximum module width — so the access survey happens during engineering, before the design is frozen.
- The compensating advantage is real. On a plot hemmed in by neighbours, compressing months of site work into a short assembly sequence is not only cheaper; it is often what makes the project acceptable to the street and the municipality in the first place.
Tax and the cost of ownership
Building a house is work on immovable property, taxed where the land is, so the destination country's treatment governs. New residential construction is normally at the standard VAT rate — 21 per cent in Belgium and in the Netherlands — and the reduced rates that come up in conversation generally attach to renovation or to demolition-and-reconstruction schemes under conditions, not to a new house on an empty plot. Luxembourg's 3 per cent principal-residence rate, described above, is the exception in the group.
Around the construction sit the local acquisition and ownership items: registration duties and notary fees on the land, which differ markedly between the three countries and, in Belgium, between regions; the annual property tax — the précompte immobilier or onroerende voorheffing in Belgium, the municipal property tax on the assessed value in the Netherlands, the communal impôt foncier in Luxembourg; and, for a non-resident owner, the interaction with your own country's position.
We set out the treatment we have assumed in the project breakdown so that your own adviser has something concrete to confirm. Rates and schemes in all three countries change from one budget to the next; none of this is advice.
What we handle, and what stays with you
One point of contact, in English, from the first look at the plot to handover: feasibility against the municipal plans and the regional code, the soil and water investigations, bespoke architecture developed to the applicable plan and delivered through a registered local architect where the law requires one, structural design to the Eurocodes with the national annex for the real wind and ground conditions, the EPB, BENG or Energiepass verification, the permit application filed in the language and format of the authority that decides it, appointment of and liaison with the Dutch quality assessor where the Wkb applies, factory manufacturing with scheduled reporting and a visit before the modules are closed, the exceptional-transport authorisations and the street and craning permits, assembly, connections and commissioning supervised by our own team, and the completion file in order.
The wider service and specification are on the turnkey luxury modular homes page and in the catalogue and quality specifications; how a cross-border project runs step by step is on international luxury modular homes, and the market-by-market comparison on luxury modular homes in Europe. Neighbouring markets have guides of their own: France, Germany and the United Kingdom. Buyers moving between Belgium, France and Spain may also want our Spanish-language guía para comprar propiedad de lujo entre España, Bélgica y Francia.
Frequently asked questions
Is there one permit procedure for the whole Benelux?
No. There are three national systems and, in Belgium, three regional ones. In Flanders a new house needs an omgevingsvergunning applied for through the regional Omgevingsloket and decided by the municipality; in Wallonia a permis d'urbanisme under the CoDT; in Brussels a permis d'urbanisme under the regional planning code. In the Netherlands permission is governed by the Omgevingswet, which since 2024 splits a new house into a spatial-planning consent against the municipal omgevingsplan and a separate technical building assessment. In Luxembourg the commune issues an autorisation de construire under its PAG and the relevant PAP. What the plot allows is always municipal; the procedure around it is regional or national.
Do the modules have to clear customs in Belgium, the Netherlands or Luxembourg?
No. All three are EU member states inside the single market and the customs union, so the modules travel as goods with no customs clearance and no import duty. They go entirely by road from the factory in Spain through France. What does need authorisation is the abnormal load itself: an exceptional-transport permit with an approved route, obtained from the federal mobility administration in Belgium, from the RDW in the Netherlands and from the Ponts et Chaussées in Luxembourg.
Is an architect compulsory?
In Belgium and Luxembourg, yes. Belgian law requires a registered architect for works subject to a building permit, and the architect carries a ten-year liability that must be insured; Belgian law also requires ten-year liability insurance for contractors on the closed shell of a dwelling. Luxembourg likewise requires an authorised architect or engineer for the permit file. In the Netherlands there is no equivalent obligation, but the Wkb quality-assurance regime brings an independent assessor into the project instead. Our designs are delivered through a registered local architect as a matter of course.
What is the Wkb and does it apply to my house?
The Dutch Wet kwaliteitsborging voor het bouwen, in force since January 2024, applies to a new detached dwelling. Instead of the municipality checking the technical design, an independent quality assessor — a kwaliteitsborger — is appointed to verify that what is actually built complies, and reports at completion; occupation follows that report. The contractor also has to hand over a consumer file documenting the house as built, and carries a strengthened liability for hidden defects. For a factory-built house this regime works in your favour: the manufacturing is documented, inspected and repeatable, which is exactly the evidence the assessor asks for.
What energy standard does a new house have to meet?
A nearly zero-energy standard in all three countries, expressed differently in each. Belgium sets EPB requirements regionally — an E-level and a shell efficiency requirement in Flanders, the QZEN requirements in Wallonia — verified by a reporter and declared after completion. The Netherlands uses the three BENG indicators together with the TOjuli overheating check, plus a separate environmental-performance limit for the materials the house is built from. Luxembourg requires class AAA for a new dwelling, documented by an Energiepass. All three are heating-dominated, and all three turn on airtightness and thermal-bridge-free junctions, which is where a factory-built envelope outperforms a site-built one.
Can a modular house be built on soft Dutch ground?
Yes, and it is routine — but the foundation, not the house, is the engineering problem. Much of the western Netherlands is peat and soft clay with a high water table, so a new dwelling normally sits on driven or screwed piles taken down to a competent sand layer, designed from a site-specific soil investigation. Coastal Flanders and the Dutch river areas behave similarly. A modular house is lighter than a masonry one, which usually helps, and the foundation is the one part of the project that cannot be built in a factory — so we commission the soil investigation during feasibility rather than after the design is fixed.
How do the modules reach a narrow street or a canal-side plot?
By surveying the final approach before the module sizes are fixed. The Benelux is the densest group of markets we serve, and access is the binding constraint far more often than the motorway leg: historic centres, bridge and quay load limits, tram and overhead lines, trees, and municipal rules that restrict when a street can be closed and a crane can stand. Where the crane can be positioned and what it can lift at that radius is what determines module width — which is why the access study belongs in engineering, not in delivery.
What VAT applies, and is there a reduced rate?
Work on immovable property is taxed where the land is. New residential construction is normally at the standard rate — 21 per cent in Belgium and the Netherlands — and the reduced rates you may read about generally attach to renovation or to demolition-and-reconstruction schemes under conditions, not to a new house on an empty plot. Luxembourg is the exception worth knowing: a super-reduced rate of 3 per cent can apply to the construction of a dwelling occupied as a principal residence, granted on prior application to the tax administration and capped in the amount of relief, with the standard rate applying to a second home. The rates and conditions change; have your own adviser confirm your position before you commit.
How much does a luxury modular home in the Benelux cost?
There is no fixed catalogue price. The budget is built on the project and broken down into architecture, manufacturing, transport, assembly, services and finishes, plus permit and study costs, the foundations and the utility connections. In this group of markets the two items that move the total most are the foundations — piling on soft ground is a real line, not a rounding error — and the access and craning strategy on a constrained urban plot. We price both on the actual plot rather than from a table.
Tell us where the plot is
Send us the municipality and the parcel reference. Before any design work we will tell you, at no cost, what the local plan allows, which soil and water investigations the plot will need and whether the modules and the crane can physically reach it.
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