The difference between a property that needs work and one that needs money is established before the offer, not after the deed. In Luxembourg the assessment has an additional layer, because part of what needs doing may not be yours to decide.
Separate what is yours from what is the building's
This is the first triage and it is specific to buying in a copropriété. Under the amended law of 16 May 1975, the structure, roof, facade, staircases and collective equipment are common parts. You do not renovate them; the general assembly votes them, and you pay your share in proportion to your millièmes.
So a viewing that reveals a tired facade or an ageing lift is not a renovation you can price with a contractor. It is a future call for funds whose timing is decided by other people. The documents that indicate its likelihood are the minutes of the last three general assemblies, the charges accounts, and the balance of the compulsory fonds de travaux, which every Luxembourg co-ownership has had to constitute since 1 August 2023.
Inside the apartment, the work is yours and can be quoted. The two categories should never be added together in one figure, because one is under your control and the other is not.
The four tiers of interior work
- Cosmetic. Paint, floor coverings, light fittings, kitchen doors rather than a kitchen. Predictable, quick, and the tier that most influences the photographs and least influences the cost.
- Replacement. Kitchen, bathroom, internal doors, flooring throughout. Substantial but boundable, because the scope is visible and the trades are known.
- Services. Electrical rewiring, plumbing, heating replacement, ventilation. Less visible, considerably less predictable, and the tier where budgets fail, because opening a wall reveals what is behind it.
- Structural or regulatory. Moving walls, altering openings, anything touching a load-bearing element or the building's common systems. In a co-ownership this needs the assembly's authorisation, and installation work of a private nature is subject to a vote.
Price a property on tiers three and four, not on tiers one and two. A kitchen that looks dated is cheap to fix; an installation from the 1970s behind a new kitchen is not.
The 3% VAT question, and why it changes the arithmetic
Luxembourg applies a super-reduced housing VAT rate of 3% to qualifying works on a principal residence, in place of the standard rate, with the tax advantage capped. For a new build sold in VEFA, registration duties apply only to the land element while the construction is subject to housing VAT at 3%, with the advantage capped at €50,000.
Two consequences at offer stage. A renovation budget quoted at the standard rate and a budget quoted under the housing regime are materially different numbers, so establish which applies to your project before you convert a quotation into an offer. And the regime is tied to conditions and to occupation as a principal residence, which means an investor's arithmetic is not the owner-occupier's arithmetic on the same building.
Getting numbers you can rely on
Estimating from a viewing produces a figure that is wrong in one direction only. Three practical steps produce something usable:
Take a trades view, not a total. Ask for indicative pricing per trade rather than a single global figure. Electrical, plumbing, heating, joinery, tiling, painting. A single number cannot be interrogated, and a number per trade tells you where the risk sits.
Get one professional through the door before the offer. Where the property is dated, the cost of an architect or a contractor spending an hour on site is trivial against the size of the decision, and it converts guesswork into a range.
Ask what was done and when. The seller should be able to say when the electrical installation, the boiler and the windows were last replaced. Where nobody can answer, assume the answer is unfavourable and price accordingly.
How the renovation interacts with the mortgage
Lending in Luxembourg is governed by CSSF limits recommended by the Comité du risque systémique and set out in CSSF Regulation 20-08 of 3 December 2020. The general loan-to-value principle is 80%, with scope for first-time buyers acquiring a principal residence to be financed up to 100%, other principal-residence purchases generally to 90%, and buy-to-let at 80%.
Acquisition costs are normally excluded from that financing and have to come from your own funds. Renovation works, by contrast, can frequently be integrated into the financing plan, and where the property has a poor energy classification a lender is more likely to require that integration than to ignore it.
The practical consequence: discuss the works with the bank before the offer, not after. A renovation folded into the loan at the outset is a different proposition from one financed separately eighteen months later.
Three questions we are asked
How much contingency should I hold? More on services than on surfaces. A budget dominated by tier one and two work needs a modest reserve; one involving rewiring or heating replacement in an older building needs a substantial one, because the scope is discovered rather than specified.
Should I renovate before moving in? Where the work is at tier three or above, generally yes. Living through services work is slow and expensive, and empty-property access reduces the labour cost.
Can I use renovation as a negotiating argument? Only with evidence. A quotation from a named trade is an argument. A general observation that the kitchen is dated is not, and sellers in Luxembourg have heard it.
Sequencing, and what it costs to get wrong
Renovation in a Luxembourg apartment runs in a fixed order, and inverting it is where budgets are destroyed rather than merely exceeded.
Services first: electrical, plumbing, heating and ventilation, because all of them run inside walls, floors and ceilings. Then plaster and screed, then joinery, then tiling, then flooring, then decoration. A new kitchen installed before the electrical installation has been assessed is a kitchen that comes out again.
Two Luxembourg-specific scheduling points. Anything touching a common part or a load-bearing element needs the general assembly's authorisation, and assemblies are held once a year, so a change requiring a vote is a change with a twelve-month lead time unless an extraordinary meeting is convened. And trades here are heavily booked, particularly through the spring and autumn, so a quotation obtained in February for work starting in March is optimistic.
Where the property is empty at completion, do the disruptive tiers before moving in. Living through services work is slower, more expensive and produces worse decisions, because every choice gets made under pressure to finish.
Three questions we are asked about timing the works
Can I start work before the deed? No. Until the notarial deed transfers ownership you have no right to alter the property, and the compromis that precedes it is a binding promise to buy rather than possession. Use the interval to obtain quotations and to schedule trades, not to begin.
Does an energy renovation change my financing? It can. Where the property is classed F to H, lenders generally expect the works to sit inside the financing plan rather than to be deferred, which means the renovation and the purchase are assessed as one project.
What about a property sold in VEFA? A different regime applies. Registration duties attach only to the land element, while the construction falls under housing VAT at 3%, with the tax advantage capped at €50,000. Compare a VEFA purchase against an existing property on total cost rather than on headline price, because the duty and VAT treatment are not equivalent.
Editorial note: Acquisition costs, tax credits, lending limits and co-ownership obligations in Luxembourg change, and every transaction differs. This article is a framework, not advice on a specific purchase. Confirm the current position with your notary, your bank, the Administration de l’enregistrement, des domaines et de la TVA, guichet.lu or a qualified adviser before relying on it.