Building in Luxembourg, end to end.

Whether a plot may be built on is decided neither by the owner nor by the developer, but by the commune’s plan d’aménagement général (PAG). Every Luxembourg commune has one; it divides the territory into zones and sets out what is permitted in each. It is complemented by the building regulations (règlement sur les bâtisses), which govern heights, roof forms, setbacks and parking.

The main zones for housing:

• HAB-1 — residential zone dominated by single and two-family houses. Low density.
• HAB-2 — residential zone allowing apartment buildings. Higher density.
• MIX-u / MIX-v / MIX-r — mixed zones (urban, village, rural): housing combined with retail, services, hospitality or crafts. The most common zone in village centres.
• BEP — zone for public buildings and facilities.
• ECO — business and activity zones; housing only exceptionally.
• ZAD — “zone d’aménagement différé”: developable in principle but frozen. Until the commune releases the area, nothing can happen. A ZAD plot is therefore worth little today and potentially a great deal tomorrow.
• Green zone — agriculture, forest, nature conservation. Building is effectively excluded; exceptions require the Ministry of the Environment.

How much may be built is governed by four ratios set in the PAG for each zone:

• CUS (coefficient d’utilisation du sol) — ratio of total gross floor area to plot area. The main lever on the number of dwellings.
• COS (coefficient d’occupation du sol) — how much of the plot may be built on.
• CSS (coefficient de scellement du sol) — how much surface may be sealed in total, including driveways and terraces.
• Dwelling density — units per hectare, frequently between 15 (detached housing) and 70 (dense apartment development).

Check it yourself: the zoning of almost every commune can be viewed on the national geoportal (map.geoportail.lu, layer “Aménagement communal”). Only information issued by the commune is binding.

In most cases the PAG classification alone is not enough. Before a building permit there must be a plan d’aménagement particulier (PAP) — a detailed development plan governing building envelopes, heights, access, parking, green space and services. The law distinguishes two types:

PAP “quartier existant” (QE)

It applies to already built-up, established parts of a locality. The PAP QE forms part of the PAG and has already been adopted by the commune — so no new plan has to be approved. For the client that means only the building permit is required and the procedure is considerably shorter. Infill gaps almost always fall into this category.

PAP “nouveau quartier” (NQ)

This is required where a new quarter is created, typically on undeveloped land at the edge of a locality. The procedure is demanding:

1. preparation by an architect or urban planner, coordination with the commune;
2. submission to the college of aldermen, opinion of the planning commission;
3. public consultation (30 days) with the right for neighbours to object;
4. vote of the municipal council;
5. approval by the Ministry of the Interior, where applicable subject to conditions;
6. convention d’exécution: agreement between client and commune on roads, services, public space, land transfers and securities.

Only then follow, where necessary, the subdivision permit (autorisation de morcellement) and the building permit itself. Twelve to thirty months is realistic; more where there are objections or environmental assessments.

Important for sellers: a plot with an approved PAP is worth considerably more than one without — but getting there costs time, money and nerves, with no guarantee of success. That is precisely the advance work the developer carries, and the purchase price reflects the difference.

The autorisation de bâtir is issued by the mayor of the commune. It is the central consent; without it no work may start. Depending on the commune, the file includes:

• architect’s drawings (plans, sections, elevations, site plan to scale);
• cadastral extract and proof of ownership;
• calculation of CUS, COS, CSS and required parking spaces;
• energy performance certificate for the proposed building;
• preliminary structural design, soil survey where needed;
• rainwater management, sewer connection and disposal of excavated material.

Further procedures may apply:

• Autorisation de morcellement — where a plot is subdivided.
• Commodo / incommodo — consent for “classified establishments” under the 1999 law; relevant for larger underground car parks, plant rooms or commercial use.
• Ministry of the Environment — for interventions in the green zone, protected biotopes, trees or watercourse margins.
• Sites and monuments — in protected areas or where listed fabric is involved.

Once granted, the permit is publicly displayed; neighbours may appeal within the statutory period. A building permit is time-limited: if work does not start, it lapses and must be renewed.

Rule of thumb: with a PAP QE and a straightforward site, four to nine months to the building permit is realistic. Add a PAP NQ and you should plan for one to three years — before any delay from objections.

Since 2018 the state has required developers to contribute to affordable housing on larger schemes. Where the gross floor area dedicated to housing in a PAP “nouveau quartier” exceeds one hectare, at least 10% of it must be designated as logements abordables and offered to the commune or the state at a regulated price.

The Pacte Logement 2.0 (since 2021) adds to this: communes receive state funding when they pursue their own housing targets and appoint a conseiller logement. That matters for landowners, because many communes now act as buyers themselves — although at regulated prices and with long decision paths.

In addition there are pre-emption rights: the state, communes and housing funds hold a droit de préemption over land in building zones in certain configurations. The notary checks this as part of the sale; the procedure can add a few weeks to the timetable.

What this means for your land: below one hectare of gross floor area the 10% obligation does not bite — and the large majority of privately held plots fall into that category. On larger sites we allow for the transfer from the outset and disclose it in the offer.

Construction costs in Luxembourg cannot honestly be reduced to a single figure — they depend on building type, ground conditions, underground parking, specification and the market. As an order of magnitude for 2026, in each case excluding land and VAT:

• single-family house, turnkey: roughly €2,400–3,200 per sqm of living area;
• apartment building with underground parking: roughly €2,700–3,600 per sqm of living area;
• underground parking space: €35,000–55,000 per space;
• fees for architect, engineers and coordination: 12–18% of construction cost;
• servicing, connections, charges and surveying: highly site-dependent.

Energy standard: new residential buildings must meet the nearly zero-energy standard; in practice that means class AA for energy efficiency and thermal insulation. With photovoltaics, a heat pump and an optimised envelope, AAA is frequently achieved. Standard today includes:

• air-to-water or brine-to-water heat pump, usually with underfloor heating;
• mechanical ventilation with heat recovery;
• triple glazing and thermal-bridge-free construction;
• photovoltaics on suitable roofs, increasingly with battery storage;
• prepared connections for electric vehicle charging;
• rainwater retention and infiltration to the commune’s requirements.

For renovation of existing buildings the state supports energy measures through the Klimabonus — insulation, windows, heat pumps — often combinable with energy suppliers’ grants. New build relies on other instruments, above all the reduced VAT rate (see chapter 07).

New-build apartments in Luxembourg are almost always sold as vente en état futur d’achèvement (VEFA) — off-plan. The legal basis is the law of 28 December 1976 on the sale of buildings to be constructed. The buyer acquires the share of land immediately; ownership of the building passes as construction progresses.

The payment schedule

Payment is made in instalments, each after verified progress certified by the architect. Typical stages: excavation and foundations, structure per storey, roof, windows and weather-tightness, fit-out, completion, handover. The land share is paid in full at the notarial deed.

The four guarantees

• Garantie d’achèvement — a bank guarantee securing completion of the building even if the developer fails. It is the most important protection when buying off-plan.
• Garantie de parfait achèvement — one year from handover: all defects noted at handover or appearing afterwards.
• Garantie biennale — two years on technical equipment: heating, ventilation, plumbing, electrics.
• Garantie décennale — ten years on load-bearing elements and weather-tightness, backed by the parties’ insurance.

What to watch in the contract

• a precise specification with materials, brands and tolerances — not merely “high-quality finish”;
• a binding completion date and what applies in case of delay;
• clear definition of areas (living area, terrace, cellar, parking space) and of the common parts;
• how buyer variations are handled: who designs, who is liable, how it is invoiced;
• the existence of the building permit and the completion guarantee before signing.

This chapter reflects the position in August 2026. Several measures in the “Booster fir de Wunnengsbau” package of 16 July 2026 remain subject to final legislation. Only your notary or tax adviser can calculate your case bindingly.

On purchase

• Registration and transcription duty: 7% (6% registration plus 1% transcription) on the price. An additional municipal charge may apply in Luxembourg City.
• Bëllegen Akt — a tax credit set against exactly those duties when buying your own main residence. The amount was raised on 16 July 2026 from €40,000 to €45,000 per person, so up to €90,000 for a couple buying together. That leaves a purchase of around €640,000 (per person) effectively free of duty. Condition: actual and personal occupation as a main residence. Unused amounts remain available for a later purchase; a minimum of €100 is always charged.
• VEFA exemption — for contracts concluded from 16 July 2026 and for three years: when buying a main residence off-plan, duty is charged only on the land share, provided the building is no more than 80% complete at the time of acquisition.
• Notary’s fee — a degressive statutory scale plus 17% VAT, together with disbursements and administrative charges.

When building

• VAT at 3% instead of 17% on the construction, conversion and renovation of housing used as a main residence. The benefit is capped at €50,000 per dwelling (around €357,000 of qualifying works). The doubling to €100,000 was announced in the tripartite agreement of June 2026 and is subject to EU approval.
• Important: approval from the Administration de l’enregistrement (AED) must be applied for before works begin or the VEFA deed is signed. Late applications cost real money.
• For housing not occupied by the owner — purely for letting — the standard rate applies. A rate of 8% is planned for socially oriented rental housing.
• Maximum qualifying living area: 400 sqm; above that the standard rate applies.

On sale

• The sale of your own main residence is exempt from capital gains tax.
• For other property: resale within two years of acquisition is a speculative gain taxed at the full rate. After that it is a capital gain, in principle taxed at half the global rate, with the acquisition price indexed.
• Allowance: €50,000 per person per ten-year period (€100,000 for jointly assessed couples).
• The temporary reduction to a quarter of the global rate applied to sales up to 30 June 2025 and has expired.

While holding

• The property tax reform (IFON) and the land mobilisation tax (IMOB) are still in the legislative process; the horizon currently mentioned is around 2028. The bill provides for a basis reflecting the plot’s development potential, an allowance for owner-occupiers and an IMOB rate of 0% for the first five years, rising thereafter.
• Accelerated depreciation for rental housing: 6% per year over six years on a base capped at €600,000 per property, applicable from 2027 with an option for acquisitions made in 2026.

The realistic routes

• Sale to a developer — quick, one counterparty, price based on development potential.
• Sale to a private buyer — usually only for small, immediately developable plots; the price is often lower because private buyers can realise less volume.
• Land in exchange for apartments — the value stays in property: you receive finished units instead of cash.
• Building lease / right of superficies — the land stays in your ownership and the developer builds against a ground rent. Of interest to families who want to keep the asset.
• Sale with right of occupancy or usufruct — capital today, keep living there.

What drives the price

Not the square metres but the achievable volume: PAG zone and density ratios, shape and topography, level of servicing, access, neighbouring buildings, noise and outlook, ground conditions, contamination, trees — and whether the commune will support the scheme. A sloping, rocky site can consume the value of several apartments in groundworks alone.

Useful documents

• cadastral extract or parcel number (section and number);
• proof of ownership; in an estate, the certificate of inheritance;
• existing survey plans, old building permits, PAP documents;
• details of easements, rights of way, farm or rental leases;
• for existing buildings: energy certificate, floor plans, tank documentation.

The most common pitfalls

• Joint inheritance — until every co-owner signs there is no sale. Sort this out early, by power of attorney if necessary.
• Usufruct — a registered usufruit requires the consent of the holder.
• Unclear access — without a secured right of way a plot is effectively undevelopable. A land register entry is worth more than good neighbourly relations.
• Pre-emption rights — the commune, the state or a tenant may step in; the notary checks this.
• Options with no deadline — they tie up your land without obliging anyone to buy. Insist on clear deadlines and exit rights.
• Verbal price promises — in Luxembourg what counts is what the compromis says. And the compromis already binds.

From offer to payment

The written offer is followed by the compromis de vente — already binding, usually with a deposit or security. The notary then checks title, charges, pre-emption rights and the cadastral position and prepares the acte de vente. Four to twelve weeks usually pass between the two. The price is paid at the notarial deed; from that moment risk and costs pass to the buyer.

Acte de vente

Notarial deed of sale. Only this transfers ownership.

Compromis de vente

Preliminary sale contract. In Luxembourg it is already legally binding.

Bëllegen Akt

Tax credit against registration and transcription duty for a main residence.

CUS / COS / CSS

Ratios for land use, site coverage and sealed surface.

Droit de préemption

Pre-emption right of the commune, the state or a housing fund.

Garantie décennale

Ten-year liability for structure and weather-tightness.

Lotissement / Morcellement

Division of a plot into several parcels; subject to permit.

PAG

Plan d’aménagement général — the communal land-use plan.

PAP QE / NQ

Detailed development plan for existing quarters (QE) or new quarters (NQ).

Servitude

An easement: right of way, services, overhang.

Usufruit

Usufruct: the right to use a property and take its income without owning it.

VEFA

Vente en état futur d’achèvement — buying off-plan.

ZAD

Deferred development zone: developable in principle, but frozen.