Approved on 23 July, Rome's overhaul of its master plan rules amends 67 articles. A 20% bonus on lawful demolished floor area, social housing in historic centre conversions, limits on short-let uses and no more reserve land in the countryside. With a heritage constraint on precisely the buildings where the bonus would pay most.
On 23 July 2026 Rome's city assembly gave final approval to an overhaul of the implementation rules of its 2008 master plan. The text amends 67 articles, more than half of those in force. The strategic framework stays; the tools used to implement it change, and with them the relative value of many properties.
The bonus and its basis
The key measure is a bonus of 20% of the lawful floor area demolished, available citywide except in the historic city.
The adjective matters as much as the number.
The bonus is calculated on floor area documented by permits; unauthorised or undocumented portions do not count. For a 1960s block with extensions never regularised, the promised 20% can shrink or vanish once lawful status is reconstructed. Planning due diligence becomes the variable that sets final buildable area, and with it what a developer can pay. Nor is the bonus automatic. It must fit zoning, distances, standards, heritage constraints and building code requirements. On tight plots in consolidated neighbourhoods, extra floor area may exist on paper without physical room.
The constraint running alongside
The overhaul is coordinated with an expanded heritage register, the Carta per la Qualità, which now lists over a thousand historic villas and many twentieth-century buildings. Demolition and rebuild projects will face a joint review by the city's heritage office and the planning department.
The friction is plain. The buildings where the 20% bonus would pay most, early and mid-century villas and small blocks in high-value districts, largely overlap with those the register tends to protect. A negative review leaves existing floor area intact but turns replacement into conservative refurbishment, with unchanged volume and entirely different numbers.
A risk to price before bidding, building by building.
Build costs are also affected by the new building code chapter, operational since late August, with mandatory environmental standards and its own bonus of up to 5% of floor area; whether it stacks with the 20% must be checked against the consolidated text.
Historic city: where value moves
No volume increases are allowed. The changes act on use. Conversions to residential must reserve 20% for social housing or pay an extraordinary levy, directly cutting the value gap that made office-to-luxury conversions profitable.
Other changes point the other way: the 60-room cap on hotels is removed and maximum retail unit size rises to 1,000 square metres, with 500 retained in the medieval fabric. Short-term rental uses get their own planning category and are barred from spaces converted from non-residential to residential.
The combined effect favours mid-sized hotels and larger shops, and penalises converting small offices into short-let flats, a common route in recent years.
Countryside closed, peripheries reworked
Agricultural "reserve areas" can no longer become building land, ending development expectations there. In the 9,000 hectares of neighbourhoods to be restructured, programmes can proceed in phases, and social housing, including student and senior housing, becomes an additional standard subject to an agreement with the city.
Several measures still need implementing acts, and transitional rules must be checked case by case.
A city choosing what to replace
The overhaul steers value towards replacing lawful existing stock and away from greenfield expectations and tourist conversions in the centre. The bonus works as a lever only where sale prices, documented lawful status, physical space and the absence of heritage constraints align. Elsewhere it opens a possibility that the numbers will have to confirm project by project.