Buying property at auction "with building violations" isn't something to avoid by default — it's an operation to evaluate technically. The question isn't whether an irregularity exists, but which one, how severe it is, and above all whether it's regularizable — at what cost and in how much time — or whether it requires restoration. The difference between a good deal and a problem lies entirely in the due diligence you do before submitting your bid.
In this guide we clearly distinguish between urban planning/building irregularities (permits, compliance, restrictions) and cadastral irregularities (floor plans and registrations for tax purposes), analyze the regularization paths updated to the Salva Casa reform of 2024, and provide an operational checklist for those who want to participate in an auction with full awareness.
In forced sales (art. 2922 Italian Civil Code) there is no warranty against defects: the property is purchased "as is." Furthermore, the bid under art. 571 of the Code of Civil Procedure is generally irrevocable and requires a deposit. This means all checks must be done before submitting — not after. The technical risk rests entirely with the successful bidder.
Urban planning vs cadastral records: two separate checks
The first mistake to avoid is confusing the two dimensions. They are separate and verified with different tools.
Urban planning/building law: concerns the legality of the construction in relation to planning instruments (PRG, PGT, PUC), building regulations, and sector rules (seismic, landscape, hygiene). The technical question is: was the existing structure built or modified with the correct permits and in compliance with applicable rules?
Cadastral records: a fiscal-descriptive representation of the property unit (identifiers, floor plan, assessed value, registered owner). The technical question is: do the data and filed floor plan correctly represent the actual state, and is the registration aligned with the real estate registries?
Practical consequence: you can have a property that's compliant with building law but not updated at the cadastral office (e.g., interior layout changed without filing a DOCFA), or a property that's "clean" cadastrally but has unauthorized building work (an updated floor plan doesn't "heal" work done without a permit). These are two separate tracks and both must be verified.
Legitimate building status: the linchpin of verification
The legitimate building status (stato legittimo) is the core of modern urban planning verification. The original building permit alone isn't enough: you need to reconstruct the last permit that covered the entire property and any subsequent permits, including the regularization categories introduced by the 2024 reform.
Two operational implications for auction buyers:
- The CTU expert report and document access should be read with the mindset of "trace the permits → compare with actual state."
- Some discrepancies may fall within tolerances (expanded in 2024) or dedicated regularization procedures: pre-1977 variants, conformity assessment for partial discrepancies (art. 36-bis), new construction tolerances.
Types of irregularities and impact on auctions, resale, and mortgages
Not all "violations" carry the same weight. Here's a map of the main types with their respective consequences:
| Type | Examples | Impact on auction and resale |
|---|---|---|
| No permit / total non-compliance | New volume without permit; extensions beyond the building envelope; unauthorized change of use | Transferable at auction (the nullity for missing urban planning references doesn't apply to enforcement proceedings), but high risk: after the transfer decree, regularization or restoration is needed. Reduces bankability. |
| Partial discrepancies / essential variations | Facade discrepancies, partitions affecting parameters, works partially diverging from the permit | Often a manageable scenario with budget and time. Since 2024, a dedicated conformity assessment exists (art. 36-bis). Key is estimating the fee and regularizability. |
| Works without SCIA or non-compliant SCIA | Works carried out without SCIA notification; non-compliant SCIA | Penalties tightened in 2024 (from double to triple, minimum from €516 to €1,032). If regularizable, costs are often contained and resolution faster. |
| Landscape restriction violations | Works in protected areas without landscape authorization | "Non-linear" risk: requires a compatibility assessment with a penalty based on damage/profit. If incompatible → mandatory restoration. Uncertain timelines. |
| Objective cadastral discrepancy | Floor plan differs from actual state (moved partitions, undeclared splits/mergers) | Not the immediate issue at auction, but becomes critical at first resale or mortgage application: deeds between private parties require floor plan conformity on penalty of nullity. |
| Subjective cadastral discrepancy | Cadastral registrations not aligned with real estate registries | Can block future sales and some bank evaluations. The notary is required to verify consistency. |
Art. 46 of Presidential Decree 380/2001 provides for nullity of private deeds lacking urban planning references — but this nullity does not apply to transfers arising from real estate enforcement proceedings. The successful bidder then has a 120-day window to submit a regularization application when the conditions are met. This makes auction purchases possible even in the presence of irregularities — provided you've quantified them beforehand.
Pre-bid due diligence: the correct sequence
Effective due diligence at auction follows a precise order. It doesn't need to be as exhaustive as a forensic investigation: it needs to be proportionate to the price and aimed at estimating the real risk.
1. CTU expert report. This is the starting point: carefully read the urban planning and cadastral sections, check whether building permits, floor plans, photos, identified discrepancies, and regularization/restoration estimates are attached. Note: report quality varies enormously. Treat it as an information base, not as a guarantee.
2. Cadastral records: surveys and floor plans. Verify objective conformity (floor plan consistent with actual state) and subjective conformity (registrations aligned with real estate registries). Remember: private deeds require cadastral identifiers, floor plan references, and a conformity declaration — on penalty of nullity (art. 29 Law 52/1985).
3. Urban planning: document access. Obtain (also through a delegated professional) the building permits and filed drawings from the municipality, to reconstruct the legitimate building status and compare it with the existing state. The right of access is based on Law 241/1990.
4. Restrictions and sector regulations. If the property falls within protected areas (landscape, seismic, historic-artistic), "regularizations" change in nature and may require binding opinions, specific penalties, and much longer timelines.
Pre-bid operational checklist
| Area | What to check | Source | Practical output |
|---|---|---|---|
| Auction procedure | Irrevocable bid, deadlines, deposit, ineffectiveness conditions | Art. 571 CPC | Decide "go/no-go" only after estimating violation costs |
| Warranties | No defect warranty in forced sales | Art. 2922 Civil Code | Budget for technical costs at your expense and risk margin |
| Objective cadastral | Floor plan matches actual state; sub-units; consistency | Art. 29 L. 52/1985 + Circular 2/2010 | Estimate DOCFA costs/timeline and floor plan alignment |
| Subjective cadastral | Cadastral registrations aligned with real estate registries | Art. 29 L. 52/1985 + Circular 2/2010 | Reduce risk of blocks in future resale/financing |
| Urban planning – permits | Original permit + variants + certificate of habitability | Art. 46 DPR 380/2001 | Reconstruct legitimate status and identify discrepancies |
| Regularizability | Tolerances, 34-ter, regularization 36/36-bis | DL 69/2024 conv. L. 105/2024 | Turn "violation" into action plan with estimated costs |
| Landscape restrictions | Need for landscape compatibility and penalties | Art. 167 D.Lgs. 42/2004 | Add timeline/process and negative outcome risk to estimate |
| Historic amnesties | Conditions for 1985/1994/2003 amnesties; pending applications | L. 47/1985, L. 724/1994, L. 326/2003 | Assess whether to finalize pending application or if not eligible |
Regularization paths: estimated timelines and costs
Here's an overview of the main regularization paths, updated to the Salva Casa reform of 2024 (DL 69/2024 converted into L. 105/2024). Time and cost estimates are indicative: they depend on municipal workloads, property size, required works, and local fees.
| Path | When it applies | Typical timeline | Typical costs |
|---|---|---|---|
| Construction/execution tolerances (expanded 2024) | Dimensional deviations and execution irregularities within thresholds; additional tolerances for works completed by 24/05/2024 | Immediate to a few weeks | Technical costs only (survey + sworn statement) |
| Pre-1977 variants (art. 34-ter) | "Historic" in-progress variants from permits issued before Law 10/1977 | Weeks/months | Parametric fee + technical fees |
| Regularization art. 36 (no permit / total non-compliance) | Works without permit or in total non-compliance | Months (municipal review) | Charges/fees + municipal contributions |
| Regularization art. 36-bis (partial discrepancies / essential variations) | Partial discrepancy from permit or SCIA; current owner is among those entitled to apply | Variable months; increases with restrictions | Fee (criteria in art. 36-bis) + technical costs. Dual conformity: urban planning at time of application, building standards at time of construction |
| SCIA art. 37 (updated penalties 2024) | Works subject to SCIA carried out without or in non-compliance | Faster than permit process | Penalty: triple the construction contribution (minimum €1,032, doubled in 2024) |
| Landscape compatibility (art. 167 D.Lgs. 42/2004) | Works on protected assets without authorization, only if compatibility can be assessed | Often months (opinions and review) | Penalty: greater of damage caused or profit gained. If incompatible → mandatory restoration |
| Historic amnesties (1985/1994/2003) | Works within amnesty time windows; often pending applications to finalize | Highly variable (often long) | Fee calculated per applicable amnesty tables |
| Restoration / demolition | When regularization is not achievable or not worthwhile | Depends on construction scope | Construction costs (demolition/rebuilding) + professional fees |
| Cadastral alignment | Almost always needed after regularization/restoration and when floor plans are non-conforming | Days to weeks | Technical costs + cadastral taxes/fees |
Four practical scenarios: from low to high severity
To help orient your evaluation, here are four common scenarios with their respective "signals" and operational approaches:
Scenario 1 — Low severity, high manageability
Typical: cadastral floor plan not updated for modest internal modifications; discrepancies within the execution tolerances expanded in 2024.
Signals: differences between floor plan and actual state without volume increase or change of use.
Management: cadastral "cleanup" (DOCFA filing) and/or tolerance sworn statement. Contained cost, short timeline. Often sufficient to make the property resalable and financeable.
Scenario 2 — Medium severity, manageable with plan and budget
Typical: partial discrepancies from permit or SCIA, essential variations that can be regularized under the new art. 36-bis rules.
Signals: divergences in facades, openings, portions; expert report mentioning "discrepancies" and hypothesizing regularization.
Management: evaluate the prerequisites of art. 36-bis, estimate the fee and timeline. This is often the "opportunity" scenario at auction — the price tends to factor in the technical cost, reducing competition.
Properties with medium-severity discrepancies are often where the best auction opportunities arise. Most buyers get scared and don't participate, the price drops, and those who've done the math correctly (regularization cost + cadastral alignment cost + margin) buy with a real advantage. The key is turning the violation into an action plan with numbers.
Scenario 3 — High severity, significant uncertainty
Typical: no permit or total non-compliance; substantial extensions; structural elements; use different from what was authorized.
Signals: missing permits in the file; inconsistent volumes; works outside the building envelope.
Management: separate the potentially regularizable portion from what requires restoration. Estimate timelines, costs, and risk margin. At auction, the risk lies entirely with the buyer.
Scenario 4 — Critical: restrictions + violation
Typical: works without landscape authorization in a protected area.
Signals: mention of restrictions in the expert report; area within a protected zone; missing authorization.
Management: verify whether a landscape compatibility assessment is admissible; estimate the penalty (damage/profit) and timelines; factor in the possibility of mandatory restoration. The risk is "non-linear" — it depends on the authority responsible for the restriction.
How to estimate risk before bidding
A practical model — not scientific, but operationally useful — involves translating discrepancies into three quantities:
1. Probability of regularization (high / medium / low). Depends on the category: tolerances have very high probability, art. 36-bis high/medium, landscape restrictions medium/low.
2. Total expected cost = penalties and fees + professional fees + construction works + cadastral update + opportunity cost (time). Penalties have fixed regulatory components (e.g., triple the contribution for SCIA, with a €1,032 minimum) and variable components (municipal fees, works).
3. Impact on strategy: "I'll live there," "I'll rent it out," "I'll resell," "I'll finance with a mortgage." Cadastral conformity and legitimate building status mainly impact resale and financing — if your goal is to live there, timelines matter less.
The bid under art. 571 CPC is irrevocable (except for specified exceptions) and doesn't allow "free market-style" suspensive conditions (like "subject to regularization" or "subject to mortgage approval"). Rather than clauses, you need internal checks before filing: have I estimated regularization costs and factored them into my maximum price? Have I verified post-award regularization (120-day window)? Is my strategy compatible with the process timeline?
The Salva Casa reform 2024: what changes in practice
DL 69/2024, converted into L. 105/2024 (known as "Salva Casa"), reshaped key tools that directly affect pre-auction evaluation:
Expanded tolerances. Construction and execution tolerances have been extended, with specific thresholds for works completed by May 24, 2024. Execution irregularities now include a broader list of "absorbed" cases — for these, no regularization is needed, only a professional sworn statement.
Art. 34-ter: pre-1977 variants. A dedicated path for regularizing "historic" in-progress variants, predating Law 10/1977, through SCIA notification and fee payment.
Art. 36-bis: partial discrepancies and essential variations. The reform's centerpiece. A specific conformity assessment, distinct from art. 36 (no permit / total non-compliance). Requirements: conformity with urban planning rules at the time of application and building standards at the time of construction. The current owner is among those entitled to apply — particularly relevant for auction buyers.
Updated SCIA penalties. Art. 37 has been tightened: the penalty increases from double to triple the construction contribution, with the minimum doubled to €1,032.
Key regulatory references
For those who want to dig deeper, here's the map of main sources organized by function:
Auctions and defect risk
- Art. 571 CPC — Purchase offers: requirements, deposit, irrevocability
- Art. 2922 Civil Code — Forced sale: exclusion of defect warranty
Cadastral records and property transfers
- Art. 29 Law 52/1985 — Cadastral identification, floor plan conformity, nullity
- Circular of the Land Registry Agency 2/2010 — Purposes and content of cadastral requirements
Urban planning and auctions
- Art. 46 DPR 380/2001 — Nullity of deeds without urban planning references; exception for auctions; 120-day window for regularization
Regularization and the Salva Casa reform
- DL 69/2024 conv. L. 105/2024 — Tolerances (34-bis), pre-1977 variants (34-ter), total non-compliance regularization (36), partial discrepancy regularization (36-bis), SCIA penalties (37)
- L. 47/1985, L. 724/1994, L. 326/2003 — Historic building amnesties
Landscape restrictions
- Art. 167 D.Lgs. 42/2004 — Landscape compatibility and penalty regime
Buying property with irregularities at auction is a choice that can generate real value — as long as you don't improvise. The method is simple in logic (if complex in execution): identify the discrepancies, classify them by severity, estimate regularization costs and timelines, and incorporate everything into your maximum bid calculation. Those who do this work before filing turn a generic risk into a calculated risk — which is the only kind worth taking.
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