Cost to render a house in Luxembourg (2026)

Render-only cost lines (strip + reapply):

• Stripping old render — €12–€22 per m², depending on substrate and render age
• Substrate repair (cracks, damaged block) — €15–€40 per m², variable
• Primer / adhesion coat — €4–€8 per m²
• Base coat + mesh — €22–€32 per m²
• Decorative top coat — €14–€28 per m²
• Scaffolding (10 weeks average) — €1 600–€3 500 for a 180 m² façade
• Site clean-up + waste removal — €400–€900

ETICS-specific additional cost lines:

• Insulation boards (EPS, wood-fibre, mineral wool) — €28–€65 per m² depending on thickness and fibre
• Anchoring / bonding — €5–€10 per m²
• Window reveals extension, new window sills — €120–€280 per opening
• Rainwater downpipe adjustment — €180–€380 per downpipe
• Door threshold adjustment — €240–€480 per door

Not every façade needs an ETICS upgrade, and not every façade survives a simple re-coat. The decision depends on four factors: substrate condition, energy-performance goal, subsidy window and budget.

Re-render on existing substrate (€55–€85 per m²):

• Existing render is sound, well-adhered and free of active cracks
• No major substrate repair needed
• Current wall thermal performance is acceptable (typically not the case on pre-1990 houses)
• Suitable for post-2000 houses with 12+ cm original insulation already in place
• Decision in 1 day; 3–6 weeks site time

Strip-and-redo (€85–€135 per m²):

• Existing render has multiple delamination zones, hollow areas when tapped
• Previous render was acrylic and has failed
• Substrate repairs needed on more than 10 % of the surface
• Heritage façade where original detailing must be preserved under the new render
• Decision in 1 day; 6–10 weeks site time

ETICS / ITE upgrade (€120–€165 per m²):

• Current wall thermal performance is below LU 2026 standard (typical for houses built before 2000 without insulation)
• Klimabonus and/or logement.lu 3 % TVA are available
• Homeowner plans to stay more than 8 years (ETICS-investment payback is typically 8–12 years)
• Structural allowance available for 14–22 cm extra wall thickness
• Decision in 2–4 weeks (requires thermal engineer's calculation); 10–16 weeks site time

The grey-zone case: A 1970s detached house with tired mineral render but sound substrate and no insulation sits at the exact decision point. Running pure ETICS adds €60–€80 per m² over strip-and-redo; Klimabonus and 3 % TVA typically refund €25–€45 per m² of that. Net, ETICS costs about €15–€30 more per m² than strip-and-redo but delivers 30–50 % heating-cost reduction — 5–8 year payback in most primary-residence cases.

Decision framework:

• Primary residence > 2 years old without insulation → ETICS typically wins
• Rental investment without subsidy access → strip-and-redo wins
• Recent construction with insulation in place → re-render wins
• Heritage façade where external insulation is forbidden → interior insulation + strip-and-redo wins

The 2026 Klimabonus programme pays targeted cash grants for energy-saving works on Luxembourg residential buildings. Paired with the 3 % TVA logement.lu mechanism, the net cost to a homeowner of a full ETICS upgrade can drop 25–40 %.

Klimabonus eligibility (2026 parameters — always verify current rate on klimabonus.lu):

• Dwelling built before 1 January 2008 (pre-energy-code) or with insufficient insulation per current rules
• Primary or secondary residence (different rates)
• Work performed by a qualified contractor with Autorisation d'établissement
• Insulation material meets minimum U-value standard (typically U ≤ 0,24 W/m²K for façade)
• Thermal engineer's energy-performance certificate before and after

Typical Klimabonus amounts for façade ETICS:

• €40–€65 per m² of treated façade, subject to annual funding envelope
• Multiplier applied for houses in energy-performance bands F, G or H
• Additional flat bonus for bundling with roof insulation or window replacement
• €6 500–€15 500 total for a 180 m² façade ETICS on a typical older house

TVA 3 % logement.lu:

• Applies to labour and materials of ETICS on primary residence > 2 years old
• Application filed via MyGuichet.lu BEFORE first invoice
• Cumulative lifetime cap on the 3 %-advantage (currently €50 000 net per dwelling)

Stacking the two on a €28 000 net façade ETICS:

Versus TVA 17 % without approval (€32 760), the saving is €13 120 — roughly 40 % of the pre-subsidy bill.

The paperwork discipline:

• Engage a qualified thermal engineer for the before/after energy performance documentation
• File the logement.lu application and the Klimabonus pre-approval BEFORE the first contractor invoice
• Keep every document (invoices, engineer's report, commune permit) for 10 years — AED and Klimabonus can both audit
• Confirm the contractor's awareness of both mechanisms before signing — many generalist painters do not know the procedure

Render systems cure correctly between 5 °C and 30 °C, with low driving rain and steady humidity. In Luxembourg, the effective application window is late March through mid-October — about 28–30 weeks. Outside this window, contractors either refuse the job or wrap the scaffold in thermal tarps at significant extra cost.

Season-by-season guidance:

• Late March to mid-May (spring) — good weather, contractors fresh from winter downtime, 3–6 % early-season discount possible on a mid-summer slot
• Mid-May to mid-July (early summer) — peak productivity, all trades available; however, inland afternoon thunderstorms common in late June can extend a job by 2–4 days
• Mid-July to early September (high summer) — hot-day application risks on mineral silicates (skin forms too quickly); early-morning starts mitigate
• Early September to mid-October (autumn) — good mid-season; book early, as many homeowners target this window
• Mid-October to late March (winter) — application mostly stopped; only tented scaffolds with internal heating make this possible, at a €6–€18 per m² premium on the full-system price

Specific weather rules:

• Overnight frost — any render applied on a day when overnight frost is forecast will freeze, crack and need replacement
• Rain within 48 hours — freshly applied base coat can wash; a common summer afternoon thunderstorm ruins a day's work
• Western elevations — driving rain risk from Atlantic low-pressure systems; the contractor may prioritise sheltered elevations in mixed-weather weeks
• Temperature swings — >15 °C day/night swing can crack surface during cure; avoid application days before forecast cold fronts

Booking discipline:

• Engage a contractor at least 4–6 months ahead for a spring or early-summer slot on a full ETICS project
• Book standalone re-render 2–3 months ahead
• Plan scaffold erection and strike in the schedule — 10 weeks of scaffold on a 180 m² façade costs €1 600–€3 500

Klimabonus application timing:

• Apply in January/February for a spring start — 6–10 week processing time at the Klima-Agence
• Approval letter must be in hand before first invoice; otherwise the subsidy is forfeited

A typical façade contract in Luxembourg lists materials and labour by face and by coat. Reading the contract line by line prevents the single biggest source of surprise — unbudgeted substrate repair.

Included in a €18 000 net strip-and-redo contract (180 m² façade):

• Scaffold erection, 10 weeks' use, and strike
• Protection of ground-floor windows, door frames and paved areas
• Stripping of existing render to sound substrate
• Substrate cleaning (pressure wash) and repair up to 10 % of surface
• Primer / adhesion coat
• Cement- or lime-based base coat with embedded glass-fibre mesh
• Decorative silicate, silicone or mineral top coat in one colour
• Detail work around windows, eaves and sills
• Waste removal and site clean-up
• Handover documentation including 10-year décennale reference

Not included — usually separate lines:

• Window replacement — priced by window
• Shutter removal and refit — €80–€220 per window
• Eaves / fascia renovation — €40–€90 per linear metre
• Dormer windows — additional €300–€800 per dormer
• Chimney render — €120–€220 per linear metre of chimney height
• Downpipe replacement — €140–€260 per linear metre
• Colour changes after mix-up — €6–€12 per m² of re-tinted area
• Extra substrate repair beyond 10 % allowance — €25–€40 per m² on top

Red flags in a façade contract:

• No mention of the render system brand (Weber, Saint-Gobain, Sto, Caparol)
• No stated breathability class (µ-value) — breathability matters on solid walls and heritage
• "Tinted to match existing" without a named colour code
• No scaffold duration estimate — scaffolding costs scale with site time
• Silence on substrate-repair allowance — write in writing the maximum surface covered in the base quote

Typical payment schedule:

• 20 % on site start and scaffold erection
• 30 % on substrate preparation complete
• 30 % on base coat + mesh complete
• 15 % on top-coat complete
• 5 % withheld 12 months as décennale warranty retention

Warranty expectation:

• 10-year décennale on structural / thermal performance (mandatory for ETICS)
• 2-year workmanship on cosmetic render
• Manufacturer warranty on system (5–15 years depending on brand)

Three façade contractor quotes on the same 180 m² building in Luxembourg commonly diverge by 20–40 %. Some of the spread is margin; most is spec interpretation and scope coverage.

The six checks that matter:

• System-brand parity. All three bidders quoting on the same manufacturer's system (Weber, Saint-Gobain/Isover, Sto, Caparol, Knauf) or a clearly named equivalent. A quote with "equivalent system" language is not comparable
• Substrate-repair allowance. A threshold of 5–15 % of surface area at a fixed unit rate, with over-threshold pricing stated. Missing allowance is the single biggest source of invoice overrun
• Insulation specification on ETICS. Thickness (cm), material (EPS graphite, mineral wool, wood-fibre), U-value target, fire classification
• Scaffold duration. Stated in weeks with stand-still costs. A 14-week scaffold for a 10-week job at €200/week adds €2 800 unexplained
• Klimabonus pre-approval handling. Who files, who chases; a contractor experienced in the programme charges €200–€450 to manage it, saves the homeowner 8–15 hours of guichet navigation
• TVA treatment. 3 % or 17 % named, with logement.lu number if 3 %

A clean briefing pack for three contractors:

• Façade elevation drawings with m² per face
• Substrate description (block, old brick, sound / deteriorated)
• Current energy-performance class and target class
• System brand preference (or open)
• Scaffold access plan (road closure, ground clearance)
• Target start and finish dates
• TVA treatment and logement.lu status
• Klimabonus application filed or pending

Red flags:

• No Autorisation d'établissement on quote header — legal risk on the worksite
• Quote cheaper than competitors by more than 20 % — usually excludes substrate repair or uses short-life acrylic system
• "Workmanship warranty 1 year" — below LU market standard
• No mention of scaffold insurance — a falling tool or panel is a €2 000–€20 000 claim
• Unlimited "extra substrate repair" at contractor discretion — rewrite as a fixed rate

Three declared firms briefed on the same pack land within ±12 % on a full ETICS job. Spreads above 20 % should trigger a reconciliation call — pick up the phone before picking the cheapest bid.