Cost to frame a house in Luxembourg (2026)

Key cost lines inside the gros-œuvre scope:

• Earthworks + foundation — €18 000–€35 000 depending on soil, plot slope and whether a basement is built
• Slab + waterproofing — €85–€140 per m²
• Load-bearing walls (masonry) — €220–€340 per m² of wall
• Timber-frame walls (closed panel) — €280–€420 per m² of wall
• Intermediate floors (reinforced concrete slab) — €140–€210 per m² of floor
• Timber-frame floors — €110–€170 per m²
• Roof structure + under-roof membrane — €180–€260 per m² of roof
• Scaffolding (15–20 weeks) — €3 500–€6 500

Pre-VAT quotes. At TVA 17 % standard, a €130 000 net shell costs €152 100 all-in; at TVA 3 % (owner's own main residence, AED approved) it costs €133 900 — a delta of €18 200.

In Luxembourg, the term gros œuvre (Rohbau) refers to the load-bearing structure and weather-tight envelope. It is one of three contract packages on a typical build: gros œuvre, second œuvre (interior finishes), and corps d'état techniques (HVAC, electrical, plumbing). Confusion at the contract boundary is the single largest source of overrun.

Typically included in gros œuvre:

• Earthworks, backfill and foundation drainage
• Reinforced-concrete footings and slab
• Load-bearing external and internal walls
• Intermediate floors (beam, slab or composite)
• Stairwell voids and elevator shaft structure
• Roof structure (timber or concrete) plus under-roof membrane and roof covering to weather-tight state
• External wall render first coat (or bare block, depending on contract)
• Chimneys and flue structures if drawn on plan
• Scaffolding for the shell duration
• Site protection, access, waste removal

Typically NOT included in gros œuvre — separate contracts:

• External cladding or final render finish
• Windows, external doors and glazing
• Internal partitions (drywall or block)
• Insulation (floor, wall, roof) — often subcontracted by gros œuvre but separate line
• Screed for underfloor heating
• Electrical, plumbing, HVAC (corps techniques)
• Interior doors, stairs finish, flooring
• Kitchen, bathroom, painting
• Landscaping and external paving

Grey-zone items — confirm in writing:

• Roof insulation
• Window lintels and openings formwork
• Bathroom waterproofing slab
• Balcony structure and waterproofing

A good practice: line up the gros œuvre and second œuvre tenders in parallel, with the architect sitting on both sides. A single general contractor (entreprise générale) coordinates but charges a 6–12 % coordination margin.

The choice between masonry and timber frame drives roughly 15–25 % of the structural cost and shapes the rest of the build.

Masonry (block or cellular concrete):

• Structural cost: lower baseline (€650–€1 050 per m²)
• Site time: slower — 14 to 20 weeks for the shell, weather-sensitive
• Thermal inertia: high — buffers summer heat in LU climate, reduces peak cooling demand
• Acoustic performance: strong, especially at room-to-room and floor-to-floor
• Finishing adaptability: most finishes possible (render, cladding, natural-stone facing)
• Energy-class A/AA compliance: achievable with external-wall insulation (ETICS) at 16–22 cm
• Resale value: well-understood by LU buyers and banks

Timber frame (closed panel, prefab):

• Structural cost: higher baseline (€870–€1 290 per m²)
• Site time: faster — 6 to 10 weeks on site (panels arrive factory-built)
• Thermal inertia: lower — requires integrated heavy layer (screed, internal masonry wall) to meet summer-comfort criteria
• Insulation: insulation sits inside the frame, reducing wall thickness vs ETICS
• Carbon footprint: 30–40 % lower embodied-carbon profile — increasingly favoured under Klimabank scoring
• Acoustic performance: requires dedicated acoustic layer between floors; baseline lower than masonry
• Energy-class A/AA compliance: reached natively with 28–32 cm integrated insulation
• Resale value: rising in LU, though valuation volatility remains higher than masonry

When timber wins:

• Steep plots where prefab minimises site disruption
• Tight build schedules
• Projects targeting passive-house certification

When masonry wins:

• Heritage-zone builds where municipal aesthetics prefer rendered masonry
• Projects where acoustic separation between rooms is critical
• Plots with easy crane and truck access where site time is secondary

A 2026 trend: hybrid builds (masonry ground floor, timber frame upper) combine masonry mass where it helps (acoustic, fire) with timber speed where it wins (roof, upper floor). Typical hybrid premium: 5–10 % over masonry-only.

The 3 % super-reduced rate on a new single-family house construction in Luxembourg is the largest TVA saving available to homeowners — worth €15 000 to €30 000 on a typical build. It is not automatic.

Eligibility:

• The building must be constructed as the owner's principal residence
• The total VAT advantage is capped — currently €50 000 net per dwelling across its lifetime
• The mechanism covers gros œuvre, second œuvre and corps techniques for the habitable portion; it does not cover furniture (including fitted kitchens), landscaping, commercial annexes or architect and engineer fees

Application steps:

1. The application goes to the AED (Administration de l'enregistrement, des domaines et de la TVA)
2. Owner signs the principal-residence declaration
3. Application filed BEFORE the works start, so contractors can invoice 3 % directly
4. AED (Administration de l'Enregistrement) reviews and issues the authorisation, typically 2 to 6 weeks
5. Each contractor's invoice references the authorisation number and applies 3 %
6. Running total of VAT advantage tracked in case it approaches the lifetime cap

Common pitfalls:

• Missing the pre-works approval — invoices are then issued at 17 % and the 3 % has to be recovered by refund claim (claims above €3 000 covering at least 6 months, invoices above €1 250 excl. VAT)
• Not living in the house as your main residence for at least 2 years after completion — the AED claws back the advantage
• Expanding the dwelling beyond the plan submitted — additional works often require a supplementary application
• Mixed use (home office beyond a certain proportion) — partial VAT recapture possible

Savings worked example on a €260 000 gross project:

The €36 400 delta is the reason most LU owners file the application early. Keep the authorisation number on every invoice and retain all files for 10 years — AED can audit retrospectively.

The Luxembourg framing calendar is driven by weather, concrete curing, subcontractor availability and permit timing. The full gros-œuvre phase runs 14 to 22 weeks from first excavation to weather-tight shell.

Typical shell timeline (150 m² masonry):

• Weeks 1–2: Earthworks, foundation drainage, footings
• Weeks 3–4: Slab pour and cure
• Weeks 5–10: Load-bearing walls (ground floor and upper floor)
• Weeks 11–12: Intermediate floor slabs
• Weeks 13–16: Roof structure and under-roof membrane
• Weeks 17–20: Roof covering, chimneys, external render first coat
• Weeks 21–22: Clean-up, scaffolding down, weather-tight handover

Timber-frame shells run 8 to 12 weeks total once panels are factory-built (panel manufacture: 6–10 weeks).

The seasonal levers:

• March to May start — best weather for slab and walls; shell typically weather-tight by autumn
• June to August start — strong progress but summer vacations of subcontractors can introduce 2–3 week gaps
• September start — risky for masonry (slab cure extends past frost window); viable for prefab timber
• November to February start — slab and block pours typically halted below 3 °C night temperatures; winter construction premium 5–10 %

Cost levers from timing:

• Book the gros-œuvre contract in autumn for a spring start — contractors offer 3–6 % early-commitment discount
• Align permit submission so authorisation lands in February or March — avoids paying scaffolding for months before start
• Lock in material prices — steel, concrete, timber and insulation prices can move 4–8 % year-over-year; some contracts include cost-escalation clauses that need careful reading

The three timing risks in 2026:

• Labour shortages in skilled trades can extend the shell by 3–6 weeks versus plan
• Prefab timber-panel lead times can stretch from 8 to 14 weeks in peak
• Commune permit delays in heritage zones or Commission-des-Sites cases — build a 4-week buffer between permit filing and contractor booking

Three gros-œuvre tenders in Luxembourg for the same architect file commonly diverge by 12–25 % — smaller than general-contractor spreads because the scope is more standardised, but still material.

The six checks that matter:

• Bid document parity. Each bidder must have received the same architect file (plans, sections, section-by-section material specification). A tender brief that lists "wall thickness per plan" is not enough — name the block model, mortar type and floor-slab thickness.
• Structural basis. Quote based on a signed structural engineer's calculation, not the contractor's assumption. Without a shared structural note, bidders take different safety margins and bids cannot be compared line for line.
• Contract structure. Forfait (fixed price) vs regie (cost-plus) vs mixed. Residential gros œuvre is almost always forfait; regie clauses inside a forfait contract are red flags.
• Payment schedule. 20 % on excavation start, 20 % on slab complete, 20 % on ground-floor walls complete, 20 % on roof structure complete, 15 % on weather-tight handover, 5 % withheld for 12 months after handover.
• Subcontractor disclosure. Some gros-œuvre packages include scaffolding and roofing subcontractors. Bidders should name these, with each subcontractor's Autorisation d'établissement reference.
• Cost-escalation clause. Material-price escalation over a 14-week construction is real — a cap or index clause protects both sides. Uncapped escalation clauses favour the contractor.

A clean briefing pack for three bidders:

• Architect-signed plans and elevations
• Structural engineer's calculation signed
• Material schedule — block type, concrete grade, steel grade, insulation
• Plot survey and access plan
• Target excavation start and weather-tight milestone
• TVA treatment (3 % or 17 %) and AED approval status
• Payment schedule and withholding terms
• Insurance certificates (RC Pro and, if the firm holds it, décennale)

Three declared firms briefed on the same pack land within ±10 %. Spreads above 15 % usually trace to: (1) different material spec interpretation, (2) different assumed productivity, or (3) a bidder loading margin for an unclear scope. Call the cheapest to ask what they cut before picking them.