Cost to build a wooden deck in Luxembourg (2026)

A €5 500 HT quote at TVA 17 % invoices at €6 435 TTC; a garden deck stays at 17 % even on a main residence, because the 3 % rate excludes the surroundings.

Format drivers:

• Species choice — Douglas is cheapest and requires annual oiling; Ipé is the most durable (25–40 year service life) but heaviest and three times the material cost
• Substructure — concrete plots on an existing paved slab cost €15–€25/m²; screw piles into raw soil cost €35–€55/m² but avoid civil-engineering work
• Board orientation — diagonal or mixed patterns add €10–€20/m² in cut waste and labour
• Surface finish — factory-grooved anti-slip boards add €8–€15/m² over smooth boards

The near-fourfold spread reflects six concrete cost lines, not installer margin.

The six drivers that matter:

• Surface area. Every extra m² costs €140–€320 in material plus labour. Doubling from 20 m² to 40 m² does not quite double the price because the substructure has economies of scale, but it comes close.
• Timber species. Douglas at €45/m² in material; Siberian larch at €75/m²; Ipé at €160/m². The species alone can double the quote on the same square metres.
• Substructure and slope. A 0–2 % slope on existing paving needs only concrete plots. A 10–15 % slope demands screw piles, a graded membrane and drainage — adds €1 200–€2 800 on a 30 m² terrace.
• Edge detailing. A single clean edge on three sides is standard. Mitred corners, integrated step-downs, planter integration and aluminium edge profiles add €600–€2 400.
• Access and logistics. A front-garden terrace with lorry access is cheap. A rear-garden terrace reached via a 4 m-wide side passage adds €350–€900 in hand-carry time. Crane-truck delivery for Ipé bundles in urban Luxembourg-Ville costs €300–€550.
• TVA stance. A garden deck is billed at 17 %; the 3 % TVA-logement rate excludes the surroundings, so no saving should be priced in.

Scope creep on a terrace project is the main cause of budget overruns.

Included in a typical €6 500 quote for a 30 m² larch deck:

• Ground preparation and geotextile membrane against weed regrowth
• Screw piles or concrete plots as substructure, sized for LU frost depth (0,8 m)
• Pressure-treated softwood joists on 400 mm centres
• Siberian larch decking boards 27 mm, screwed with stainless A4 inox
• Perimeter edge profile and ventilated under-deck
• Removal and disposal of site spoil
• Commune notification where applicable
• Ten-year décennale cover

Usually not included — expect a separate line:

• Demolition of an existing terrace — €15–€35/m²
• Drainage to the sewer or rainwater tank — €350–€900
• Railings or balustrade — €90–€180/linear metre
• Integrated LED lighting — €45–€75/metre strip, plus €350–€650 electrician's declared drop
• Aluminium pergola over the deck — €1 600–€5 800 on a separate contract
• Annual maintenance oiling — €8–€14/m² per visit, normally every 12 to 18 months

Red flags:

• No mention of frost depth — plots set above 0,8 m lift in the first hard winter
• Galvanised steel screws instead of stainless A4 — they stain the timber within 18 months
• Quote silent on substructure ventilation — no air gap causes rot within 5 years
• A 5-year warranty instead of the 10-year décennale — only unregistered workers offer 5-year

A wooden deck in the garden counts as landscaping around the house (aménagement des alentours), which the 3 % TVA-logement rate excludes — whether it is new or replaces a worn terrace, and also on a main residence. Plan on 17 %. Only a terrace that forms part of the building itself — structurally attached to the dwelling, such as a roof terrace or a balcony — follows the dwelling's 3 % rules.

Rate in practice:

• Deck replacing a worn terrace in the garden of a main residence: 17 %
• New deck in the garden that is not part of the building: 17 %
• Deck on a second home or a dwelling that is nobody's main residence: 17 %

What a compliant invoice shows:

• Net amount per line (ground prep, substructure, timber, labour, finishing)
• TVA line at 17 %, stated explicitly
• Timber origin certificate (PEFC or FSC) for tropical species
• Décennale policy number and Autorisation d'établissement reference
• ITM registration for the installation crew

All-in on a €6 500 net project:

A quote showing 3 % on a garden deck is wrong — ask the contractor to correct it before signing.

Terrace quotes diverge because scope is rarely stated the same way by two firms. A shared brief pulls the spread into a usable band.

The six checks that matter:

• Timber grade and origin. Douglas, larch, thermo-ash, Ipé, composite — each at a specific grade. Ask for the supplier name (Silvadec, Accoya, Eurowood) and the origin certificate.
• Substructure specification. Screw piles versus concrete plots, and the frost-depth number. A couvreur who cannot name 0,8 m as the LU frost depth is not thinking about the first winter.
• Fastening quality. A4 stainless screws or nothing. Galvanised fails within two winters on oak and Ipé.
• Drainage and ventilation. The gap under the boards must be at least 50 mm and ventilated at both long edges; drainage of the ground underneath must be stated.
• Warranty depth. Ten-year décennale on the structure, two-year workmanship on the boards. Timber warranties are manufacturer-only; insist on the brochure copy.
• TVA stance. All three quotes should show 17 % on a garden deck; a bidder quoting 3 % is misreading the rule.

A clean briefing pack:

• Measured plan with target surface, access width and slope
• Current surface (lawn, pavers, old terrace) with photos
• Preferred timber species and substructure
• Lighting and pergola intentions
• TVA position (primary residence, secondary, new-build)
• Delivery window (avoid November to March for installation)

Quotes on the same pack land within ±15 % of each other on price. A wider spread flags a scope misread.