Ibiza and Formentera appear to be experiencing a major construction boom, but the latest figures from the Official College of Architects of the Balearic Islands tell a much more complicated story.

Data from the COAIB Construction Observatory for the first half of 2026 show that 1,080 building projects were formally registered across Ibiza and Formentera, compared with 757 during the same period in 2025.

That represents a 42.67% increase and, on the surface, suggests a dramatic acceleration in construction activity.

But there is an important catch.

A large proportion of the additional projects are not new buildings at all. They are extraordinary legalisation procedures involving properties or structures that were already built.

Once those cases are removed from the figures, the apparent boom almost disappears.

Strip Out the Legalisations and the Boom Disappears

Of the 1,080 projects registered during the first six months of 2026, 627 remain after extraordinary legalisation files are excluded.

That compares with 639 comparable projects during the same period of 2025.

In other words, genuine activity was broadly stable, with a slight decline of around 1.9% rather than a 42.67% increase.

The difference is crucial when interpreting what is happening on the islands.

The headline figures describe a much busier construction sector, but they include administrative procedures designed to bring existing buildings into legal compliance.

They do not mean that thousands of new buildings are suddenly being constructed across Ibiza and Formentera.

What Are Extraordinary Legalisation Procedures?

Extraordinary legalisation allows certain existing buildings or structures that were previously carried out without the necessary planning status to enter a formal legal framework under specific conditions.

From the perspective of architectural statistics, these cases generate professional work and therefore appear in the number of registered projects.

But the physical building may have existed for years.

That means a legalisation can increase the number of "works" appearing in the statistics without increasing the island's building stock in the same way as genuinely new construction.

This distinction is particularly important in Ibiza, where the housing shortage and pressure on available land make the amount of genuinely new residential construction a major issue.

Detached Housing Shows the Effect Most Clearly

The strongest example can be seen in detached residential properties.

Ibiza and Formentera registered 429 detached housing projects during the first half of 2026, compared with 297 during the same period in 2025.

That appears to represent growth of 44.44%.

But once the extraordinary legalisations are taken out, the number falls to just 198 genuinely new detached homes, which is around 10% below the previous year's figure.

The difference is substantial.

Of the 429 detached housing projects appearing in the headline figure, 231 relate to legalisation procedures for homes that were already physically present.

So the apparent expansion in detached-home construction is largely explained by existing buildings entering the formal planning record.

The Rural Land Effect

The figures are even more striking when rural land is examined separately.

A total of 255 detached homes were registered as new creation on rural land during the first half of 2026.

However, 231 of those were extraordinary legalisations.

That means the overwhelming majority of detached residential projects counted in this category were not genuinely new homes being built from scratch.

Instead, they were existing constructions being regularised through the extraordinary legalisation process.

This distinction is particularly important given the long-running sensitivity surrounding construction and planning on rural land in Ibiza.

Free-Market Apartment Construction Is Falling

While legalisations inflate the number of detached housing projects, another part of the residential market is moving in the opposite direction.

Free-market multi-family housing has fallen significantly.

The number of units registered dropped from 514 during the first half of 2025 to 376 in the first half of 2026.

That represents a decline of approximately 26.85%.

This is an important figure because multi-family housing can create considerably more homes within a smaller land footprint than detached development.

For an island facing severe housing pressure, a reduction in this type of development is particularly significant.

Why Apartment Construction Matters for the Housing Crisis

Ibiza's housing shortage is not simply a question of how many buildings are being constructed.

The type of housing being created matters just as much.

A large detached property may represent a significant construction investment while adding only one residential unit.

A multi-family project can create dozens of homes within the same general urban area.

This makes apartment development particularly relevant to efforts to increase housing supply for people who live and work on the islands.

The latest figures therefore suggest that the apparent increase in construction activity is not necessarily translating into the kind of housing supply that Ibiza needs most urgently.

Protected Housing Remains Extremely Limited

The figures for affordable and protected housing underline the problem.

Limited-price detached housing fell from three registered units in the first half of 2025 to zero in 2026.

Limited-price multi-family housing also declined, from seven units to just two.

Protected housing, known as HPO, performed somewhat better, with 48 units registered through COAIB and another 81 units reflected in figures supplied by the Balearic Housing Institute, IBAVI.

Even taking the larger figure, the contribution remains small compared with the island's overall housing needs.

A total of 805 newly created homes were recorded during the six-month period, meaning protected housing represents only a relatively small proportion of the overall total.

The Construction Budget Has Still Increased

The story becomes more complex when looking at the financial value of projects.

The total construction budget registered by architects in Ibiza and Formentera reached approximately €536 million during the first half of 2026.

That is 24.49% higher than the comparable period in 2025.

Housing was the biggest contributor, with approximately €433 million in registered budgets, an increase of 62.57%.

The figures demonstrate that substantial investment is taking place across the Pitiusas.

But once again, the composition of that investment matters.

Not all of the €536 million represents new buildings.

The total includes a broad range of architectural activity, including legalisations, refurbishments, extensions and other work on properties that already exist.

Industrial and Agricultural Construction Jumps

One of the most dramatic increases appears outside the residential sector.

The budget registered for industrial and agricultural works rose from approximately €1 million to €13 million, an increase of more than 1,000%.

The surface area associated with these projects also increased by more than 660%.

Such an extraordinary jump appears to be influenced heavily by one or a small number of major projects rather than representing a broad expansion across the entire industrial construction sector.

Large individual projects can have a disproportionate effect on percentage comparisons when the starting point is relatively small.

Tourism Construction Is Going in the Opposite Direction

Tourism-related construction tells another story.

The value of tourism projects registered during the first half of 2026 fell from approximately €114 million to €78 million.

That represents a decline of around 31.5%.

The total surface area associated with tourism projects also decreased, falling by approximately 21%.

Interestingly, the number of tourism-related files actually increased by 17.14%, reaching 41 projects.

This suggests that there were more tourism projects being registered but that they were, collectively, considerably smaller in financial value and surface area than those recorded during the previous year.

More Projects Does Not Necessarily Mean More Construction

The combination of these figures highlights a recurring problem when interpreting construction statistics.

The number of architectural files can increase sharply without a corresponding increase in physical construction activity.

A large number of legalisation files can make the sector appear extremely active even though many of the structures involved already exist.

At the same time, a small number of very large projects can significantly change the total investment figure.

Looking only at one indicator therefore risks giving a misleading impression of what is actually happening on the ground.

Santa Eulària Leads New Detached Housing

The distribution of genuinely new detached homes differs considerably between municipalities.

Santa Eulària des Riu recorded 124 new detached homes during the period, making it the leading municipality in this category.

Sant Josep followed with 109, while Sant Antoni recorded 96.

Sant Joan registered 58, Ibiza Town 27 and Formentera 15.

The figures show that detached housing remains an important part of the residential model across much of the island.

They also underline how uneven development patterns are between municipalities.

Sant Antoni Leads Multi-Family Housing

The picture changes significantly when multi-family free-market housing is considered.

Sant Antoni de Portmany accounted for 185 of the 376 units registered across the Pitiusas.

Santa Eulària followed with 77 and Ibiza Town with 72.

Formentera contributed 28 units.

Sant Josep, despite being one of the leading municipalities for detached housing, recorded just two free-market multi-family units.

The contrast demonstrates that each municipality is following a very different residential development pattern.

The Extension Figures Reveal Another Legalisation Effect

Another striking figure concerns extensions to detached homes.

The surface area registered for these extensions rose from 12,725 square metres at the end of 2025 to 76,442 square metres by June 2026.

That represents an increase of more than 500%.

Again, the explanation is closely linked to extraordinary legalisations.

Some of the additional surface area reflects existing construction being formally incorporated into the planning record rather than thousands of square metres of new extensions suddenly being created.

The Numbers Do Not Mean Ibiza Is Building 43% More

The headline 42.67% increase in registered works should therefore not be interpreted as a 42.67% increase in actual construction.

After extraordinary legalisation files are removed, the number of projects is virtually unchanged compared with the previous year.

The underlying construction market is therefore far less dynamic than the headline figure initially suggests.

There is activity, there is investment and there are new projects, but the scale of genuinely new construction is much more modest.

A Housing Market Under Pressure

The distinction is especially important because Ibiza continues to face severe pressure in its residential market.

Demand for homes remains high, while available housing is limited and prices remain beyond the reach of many local workers.

In that environment, adding a large number of new homes would potentially help ease pressure.

But legalising homes that already exist does not create the same additional supply.

Nor does a high-value detached property necessarily address the needs of households looking for affordable accommodation.

The latest figures therefore raise questions about the type of construction Ibiza is producing, not simply its overall volume.

The Apparent Boom Masks a Structural Problem

The COAIB data reveal a construction market with several very different realities operating at the same time.

On paper, the sector is growing rapidly.

In practice, much of the increase comes from bringing existing buildings into the legal framework.

Detached housing appears to be expanding, but much of the increase comes from legalisations.

Free-market apartment construction is declining.

Protected housing remains limited.

Tourism construction is worth less in monetary terms despite involving more individual projects.

And large industrial or agricultural projects are distorting some of the headline growth figures.

Taken together, these trends paint a considerably more nuanced picture.

Why This Matters for Ibiza's Future

For an island like Ibiza, construction data are more than an economic indicator.

They are directly connected to housing affordability, land use, environmental pressure, infrastructure and the future shape of local communities.

A construction model dominated by detached properties can consume large amounts of land while creating relatively few housing units.

A strong legalisation programme can improve planning compliance without materially increasing housing supply.

A shortage of protected housing can leave residents competing in an increasingly expensive private market.

And a decline in multi-family development could make it harder to increase housing capacity in existing urban areas.

The Real Question Is Not How Much Ibiza Is Building

The latest figures suggest that the most useful question is no longer simply how many construction projects have been registered.

The more important questions are what is actually being built, how many genuinely new homes are being created, where they are being built and who they are likely to serve.

The first half of 2026 provides some clear answers.

Ibiza and Formentera are not experiencing a conventional construction boom on the scale suggested by the headline statistics.

Instead, the islands are seeing a significant wave of extraordinary legalisations, combined with continued investment in private housing and a worrying shortage of affordable and protected homes.

Ibiza's Construction Boom Has a Different Story Behind It

The latest COAIB figures do not show an island suddenly covered in new construction.

They show an island working through a major legalisation process while its underlying construction activity remains broadly stable.

The 1,080 registered projects look impressive until the 453 extraordinary legalisation files are separated from the picture.

What remains is a much more modest level of genuine construction, with new apartment development falling and affordable housing still representing only a small proportion of total residential activity.

For Ibiza, that may be the most important message in the entire report.

The island is certainly busy with construction-related activity, but the numbers do not yet indicate that enough of the right kind of new housing is being created to match the scale of the housing challenge.