Selling your lake house: the papers, the taxes, the timing

Land registry. Every deed transferring an existing house must cite the floor plans filed with the land registry and contain the owners' declaration that cadastral data and plans match the actual state; the declaration can be replaced by a qualified technician's certificate. Without it the deed is void. Before signing, the notary also checks that the cadastral owners match the property registers¹. A moved staircase, a cellar turned into a room, a closed-in porch: these are the first things to look at, because the land registry is updated before the deed, not after.

Legitimate state (stato legittimo). It is the house as described by the permit under which it was built, or by the one that governed the last works on the whole building, plus the permits for later partial works; amnesties and fines paid count too. For houses built when no permit was required, the first cadastral survey, photographs, archive papers and other documents of certain origin apply². On the lake, with its old villages and hillside farmhouses, it pays to know from the start which of the two routes applies to your house.

What the deed must state depends on when the house was built:

Habitability (agibilità). Today it is attested by a certified notice, required after new construction, rebuilding and works affecting safety, hygiene, healthiness or energy saving; failing to file it when due costs from €77 to €464⁵. In the rules we read, its absence does not make the deed void: but the buyer and their bank will ask for it, and if it is missing they must be told before the preliminary contract.

The full list, with where to request each document, is in the tool Documents to sell.

In lake houses the measurements rarely match thirty-year-old drawings to the centimetre. The law does not treat as a violation a deviation within 2% in height, distances, volume, covered area or any other parameter; for work done on or before 24 May 2024 the margin allowed rises as the unit gets smaller⁶:

Then there are execution tolerances: minor geometric irregularities, finishes, systems and internal works placed differently during construction. Note the point that matters on the lake: the law allows them only for buildings that the Cultural Heritage and Landscape Code does not protect⁶. Many lakeside houses lie within the 300-metre band or in the areas of the 1985 decrees described in the guide Renovating on the lake: ask your technician whether your house is affected before relying on them.

Tolerances are not «regularised»: the technician declares them, in later building applications or in an affidavit annexed to the deed of sale⁶. It is worth having it ready before the preliminary contract.

Beyond the tolerances. For partial discrepancies from a building permit or a SCIA, the law since 2024 allows today's owner, not only whoever did the works, to apply for regularisation if the work complies with current planning rules and with the building rules in force when it was done. A fee is due: for discrepancies from a permit, twice the building contribution increased by 20%, without the increase if the work complied both then and now; for works without a SCIA or departing from it, twice the increase in value estimated by the Revenue Agency, from €1,032 to €10,328, from €516 to €5,164 if the work complied both then and now⁷.

And the landscape? If the non-compliant works also lacked landscape authorisation, the office asks the authority in charge of the constraint for a binding opinion, even where they created floor area or volume: the authority decides within 180 days, the heritage superintendency gives its view within 90, and if the opinions do not arrive, silence counts as consent. If the works are found compatible, a further fine equal to the greater of the damage and the profit is due; if not, they are demolished⁷. This route covers partial discrepancies and SCIA works; for works done without a building permit or in total departure from it the rules are stricter, and for the landscape see Renovating on the lake.

The energy performance certificate must be made available to the buyer when negotiations start and handed over at the end; in the deed the buyer declares having received it and a copy is attached. If the declaration or the attachment is missing, the parties pay, jointly and in equal shares, from €3,000 to €18,000⁸. The sale listing must show the energy indicators, or whoever publishes it pays from €500 to €3,000; the certificate is valid for up to 10 years⁸.

Systems. The article of the systems decree that required handing compliance declarations to the buyer and annexing them to the deed was struck out in 2008⁹: attaching them is no longer an obligation. The declarations are still the simplest way to answer a buyer's questions; if you do not have them, say so and write it into the preliminary contract.

The condominium, if the house is part of one: the buyer answers, jointly with the seller, for contributions of this year and last year; the seller remains liable for charges accruing until the administrator receives a certified copy of the deed¹⁰. Ask the administrator for the payment position before the preliminary contract and send them the deed right after completion.

Payment and agent. Seller and buyer state in the deed how the money moved and whether an agent was involved, with the agent's details, registration number and the fee paid. An omitted or false declaration costs from €500 to €10,000 and leads the Revenue Agency to reassess the value¹¹.

The buoy and the jetty do not go with the house: the concession is personal and passes to the buyer only with a new title and if nobody else has applied. How it works, and what to prepare, is in the guide Boats, buoys and swimming.

A private individual's sale of a house is taxed in one case only: if it was bought or built no more than 5 years earlier. The difference between the price received and the price paid, plus any other cost that belongs to the house, is a capital gain that is added to the year's income¹². Left out are a house received by inheritance and one in which the seller, or a family member, had their main home for more than half the time they owned it¹².

The preliminary contract does not move the clock. What counts is the date of the purchase deed and that of the sale deed: a preliminary contract signed and a deposit received before the 5 years do not trigger the gain, and the sale stays exempt if the deed comes after. But a garage, a cellar or a piece of garden bought later have their own count: if you sell them with the house within 5 years of buying them, the part of the price relating to them is taxed¹⁴.

How it is paid. At the deed you can ask the notary to apply a 26% substitute tax: the notary works it out, takes the amount from you and pays it¹³; otherwise the gain goes into your tax return and pays the year's IRPEF¹². Which is better depends on the rest of your Italian income: it is a calculation to make with an accountant before signing.

An example with the lake's figures. Assumptions: a 150 m² villa in OMI zone B2 of Orta San Giulio (lakefront and island), bought in December 2024 at the centre of the OMI range of the time, 1,900–2,800 €/m², and sold in 2026 at the centre of the 2nd-half-2025 range, 2,100–3,000 €/m²¹⁹. Purchase €352,500, sale €382,500: a difference of €30,000. Less €20,000 of documented costs your adviser accepts as inherent (assumption: purchase taxes and notary, invoiced works), €10,000 remain; the substitute tax is €2,600. If the sale deed comes more than five years after the purchase, that is from December 2029, it is zero. OMI quotations are estimates per zone, not prices: your case is made by the real price and the real invoices.

IMU in the year of sale is split by months between seller and buyer; the rule on months and the day of the deed, and the rates of the thirteen municipalities, are in the guide IMU property tax on the lake.

In 2027 the same rules change address: from 1 January the new consolidated code (Legislative Decree 117/2026) holds them in articles 25, 76, 77 and 244, with the same thresholds and the same rate¹³. The Council of Ministers' press release on the 2027 budget bill, of 28 October 2026, announces for housing the flat tax on agreed-rent leases and the one on commercial premises, not changes to capital gains²⁰; we have not yet read the official text of the bill.

Whoever sells an inherited house pays no capital gains tax, but must have the succession in order: the buyer's notary traces the transfers of ownership in the registers, and the title must be proven as for any other house. The tool Documents to sell lists the deeds to retrieve.

For a house received as a gift the historic problem was different: the donor's children or spouse whose reserved share had been infringed could, on the donor's death, claim the house back even from whoever had bought it from the donee¹⁵. With Law 182 of 2025, in force since 18 December 2025, reduction of the gift no longer affects the buyer: the forced heirs are owed monetary compensation by the donee¹⁵. The new rule applies to successions opened after that date, and also to earlier ones if by 18 June 2026 none of the forced heirs had served and registered a reduction claim or formally opposed the gift¹⁵. If your lake house was given to you, have the notary check exactly this in the property registers.

If the house is yours but you live in Germany, Switzerland, the Netherlands or the United Kingdom, for the Italian tax authorities you are non-resident, and a non-resident is taxed in Italy on income from assets located in Italy¹²: if you sell within 5 years of buying, the gain on the lake house is taxed here, and the notary can apply the 26% for you just as for a resident¹³. From 2027 the same rule is in article 25 of the new code¹³.

What your own country does with the same sale, and how the double taxation treaty divides the right to tax, depends on the country: ask an adviser there before the preliminary contract. To sign you need an Italian tax code (requested from the consulate, as explained in Buying property in Italy) and to appear before the notary; whoever cannot come signs through a power of attorney, which must have the same written form required for the sale¹⁶.

If after the sale you move to the lake yourself, or leave it, the guide Moving to the lake explains what changes for residence and taxes.

The Property Market Observatory divides provinces into macro-areas of neighbouring municipalities. The lake touches two: «Lago d'Orta» in the province of Novara and «Cusio» in Verbano-Cusio-Ossola¹⁷. In 2025 the first recorded 119 home sales, 34.9% more than in 2024, and the highest average quotation in the province, 1,423 €/m²; Cusio 291, with the lowest average quotation in the VCO¹⁷:

A stock share of about 1.97% means that in a year one home in fifty changes hands. It is a small market: few sales, and each one counts. Quotations by municipality and zone are in the guide Lake Orta property prices.

On timing there is no figure for the lake alone. The Bank of Italy's quarterly survey of about 1,500 agencies gives these values for the second quarter of 2026¹⁸:

According to the Bank of Italy, discounts and times are close to their lowest since the survey began, while new mandates to sell keep falling¹⁸: there is less supply. The lake is a «non-urban area» of the north-west; a second home with a view, though, has buyers of its own and times no statistic measures.

The first step costs little: cadastral record, floor plan, building permits and energy certificate on the table, and a technician to say whether the house matches. The tool From price to net shows what is left from a price after taxes and costs; What is my home worth gives the OMI range for your zone.

If you prefer a personal view on price, papers and timing, you can tell us about your house: we look at it and tell you what we think. If instead the idea is to keep it and make it earn, start with Renting out your lake home.