Building an interior wall cost in Luxembourg (2026)

All values incl. TVA 17 %. The 3 % super-reduced rate applies on principal residences at least ten years old at the start of the works (logement.lu).

What is included in the per-m² price:

• Tracks, uprights, insulation (mineral wool for acoustic drywall)
• Two layers of 12,5 mm plasterboard on each side for double-skin
• Jointing, sanding and priming ready for paint
• Single door opening with lintel (one per 12 m² panel)

What is excluded — separate line:

• Door leaf and frame (€350–€650 for a standard interior door)
• Electrical first-fix (sockets, switches — €90–€140 per point)
• Final painting (€25–€40/m² for two coats on both faces)
• Skirting boards or floor reinstatement

The choice between stud drywall and masonry is driven by acoustic performance, whether plumbing or heavy cabinets will be fixed to the wall, and the feel of the property.

Pick drywall when:

• The wall only separates dry rooms (bedroom and dressing, office and living)
• Acoustic class 36–45 dB is sufficient — a standard double-skin with mineral wool reaches 42 dB at 120 mm thickness
• Nothing heavier than shelves (reinforced with studs behind plasterboard) will be fixed
• The wall runs across an intermediate floor — a 60 kg/m² partition stresses the floor far less than a 220 kg/m² masonry wall

Pick masonry when:

• The wall separates a wet room (bathroom, WC) from a dry room — tiles and shower splash demand a block base
• A kitchen wall must take wall units loaded with food storage
• You want 50+ dB acoustic performance between two bedrooms or bedroom and living
• The house character is stone-and-plaster and you want fixtures that feel solid
• A fireplace, log burner or radiator stand will sit against the wall

Hybrid builds worth knowing:

• Masonry base up to 1,2 m plus drywall above — common in bathrooms where only the lower tile zone needs masonry
• Acoustic drywall with 2 × 15 mm board and resilient-bar mounting — reaches 55 dB, close to masonry acoustic performance, but costs €170–€200/m²
• Concrete block with double-skin drywall lining — overkill but delivers 60+ dB, used between apartments in converted townhouses

On a single-family home with no specialist requirement, stud drywall is the default and saves 30–40 % versus masonry.

Interior wall construction inside a residential renovation qualifies for the 3 % super-reduced TVA under logement.lu on principal residences at least ten years old at the start of the works. The dossier must be filed before works begin.

Rate in practice:

• Principal residence, at least 10 years old, owner-occupied — TVA 3 % on labour and materials, capped at €50 000 lifetime TVA saving per dwelling
• Rental or second residence — TVA 17 % standard
• Dwelling under 10 years old — TVA 17 %, because logement.lu targets renovation only

Example: 24 m² of drywall partitioning in a family home:

A saving of about €406 on a €2 900 project — worth filing the dossier. On larger renovations (kitchen, bathroom, bedroom partitioning all in one phase), the TVA saving commonly tops €2 500.

Declared labour — the non-negotiable rules:

• Contractor must hold an Autorisation d'établissement from the Ministère de l'Économie
• Workers must be declared at the CCSS and ITM
• Public-liability and decennale insurance must be referenced on the quote
• Cash-only offers without an invoice expose you to joint liability for undeclared labour and remove any warranty recourse

A partition-wall quote longer than one paragraph is a good sign. Anything below 500 words of specification leaves room for later creep.

The ten items to check:

• Wall length, height, and resulting m² (with a plan view showing room geometry)
• Build-up: single or double skin, stud spacing, board thickness, insulation type and thickness
• Acoustic class expected (in dB), verified per manufacturer spec sheet
• Door opening position, width and lintel construction
• Scaffolding or podium steps if ceiling over 2,8 m
• Dust sheeting and floor protection to adjoining rooms
• Tool waste and offcut disposal to a licensed site
• TVA line at 17 % or 3 % (with dossier reference)
• Payment schedule: 30 % on start, 40 % at skimming, 30 % on completion
• Workmanship warranty: 2 years minimum, decennale for structural partitions

Common line-items missed — insist they are named:

• Electric socket and switch boxes pre-fitted into the wall build-up
• Radiator pipework passage through the wall
• Acoustic sealant at the wall-to-floor and wall-to-ceiling junctions — the single biggest source of acoustic failure when missed
• Primer coat (not paint — just a finishing primer ready for the painter)

Red flags:

• A lump sum without m² rate
• No stud spacing or board thickness specified
• No acoustic class stated for a bedroom or office wall
• A verbal agreement to add electrics later — always get these on the initial quote

Interior wall construction is fast — that is one of its main advantages. Planning around the disruption matters more than the build window itself.

Typical durations:

• Single-skin drywall, 12 m², no electrics — 1 to 1,5 days of active work
• Double-skin acoustic drywall, 12 m² — 2 to 3 days
• Masonry wall, 12 m² — 3 to 5 days plus a drying window of 5 to 10 days before finishing
• Full partitioning of a 30 m² floor into three rooms — 5 to 8 days drywall, 9 to 14 days masonry, plus finishing

Disruption profile:

• Dust is the main issue; masonry produces more, drywall less but still coats the room
• Plan to seal off the working room with a zipped plastic door and keep kids and pets out
• Noise: masonry is louder (drilling for lintels, cutting blocks); drywall is quieter but still uses circular saws
• Service continuity: no cold-water or electricity cut if the wall is purely non-structural and no utility passes through

Access details that matter:

• Upper-floor projects need material carry up the stairs — factor a half-day labour premium for 2nd floor or higher
• Lift access to the apartment makes a real difference on delivery day; mention it in the quote request
• Parking: commune permits for a dumpster or supply vehicle run €60 to €180 depending on commune
• Ceiling height over 2,8 m adds podium steps or light scaffold at €120 to €280 per day

Sequencing within a larger renovation:

• Partition walls go up before electrical first-fix, before plastering, before flooring and paint
• If flooring is already in place, demand a protective underlay with 10 mm cushion be priced separately — damage to existing flooring is the single biggest cause of contractor disputes

Three quotes on the same brief should land within a 20 % spread. A wider gap nearly always means different inclusions, not different pricing intelligence.

The single-page brief to send:

• A floor plan sketch showing the new wall position, length and door opening
• Ceiling height of the room (flag if over 2,8 m)
• Build-up choice: confirm drywall or masonry, acoustic target if relevant
• Existing floor finish (tiles, parquet, laminate) and whether it needs protection
• Access details: floor level, lift or stairs, parking options
• TVA status: principal residence with logement.lu dossier filed, or not
• Target date for start and hard deadline if any

What clean quotes look like:

• Quote A (€2 680 all-in): 12 m² × 2,5 m high, Knauf W112 system, 2 × 12,5 mm plus 60 mm mineral wool between studs, 2 years labour warranty, TVA 3 % with logement.lu dossier ref
• Quote B (€2 950 all-in): Same spec with an extra electric-box block and a thicker acoustic batt upgrade; cleaner breakdown of included vs extras
• Quote C (€3 400 all-in): Mid-range spec but includes painting primer on both faces and flooring protection for the adjoining room

Red-flag quote shapes:

• A figure "from €1 800" without scope — meaningless until itemised
• A price under €80/m² on drywall — either a single-skin with no insulation, or undeclared labour
• A price over €300/m² on a plain drywall partition — unusual and should be explained line by line
• Insistence on cash or bank transfer without invoice — walk away

Always check the Autorisation d'établissement number on the Ministère de l'Économie register before signing.