Converting Dublin Offices to Homes: The Case for Office Reuse in Ireland

The debate around office vacancy often treats availability as a short-term cycle. In reality, a material proportion of office stock is structurally sound but economically obsolete in its current use. That distinction matters — because it changes what the right response looks like.

How much office space is actually at risk?

Market studies consistently show that prime office space remains in demand, while older secondary stock is increasingly challenged. In Dublin, vacancy rates have eased back towards the mid-teens, but demand is concentrated almost entirely in best-in-class, ESG-compliant buildings. Older stock is struggling to compete — not because there are no occupiers, but because the gap in quality and energy performance has become commercially decisive.

In the UK, this trend is more explicitly quantified. Research by Savills and JLL indicates that approximately 30–40% of London’s office stock faces functional or regulatory obsolescence over the next decade, driven by tightening energy standards, shifting occupier expectations, and the cost of bringing ageing buildings to compliance.

Speed: why reuse matters in a constrained system

Housing delivery in Ireland is fundamentally constrained by time. New residential schemes in urban areas typically face long planning horizons, high construction and financing costs, and prolonged delivery periods. In our own experience working on sites in Dublin 1, 2, and 4, the structural complexity and pre-application process for ground-up schemes routinely adds 18–24 months before a spade enters the ground.

Reuse projects can often be delivered materially faster: the structure already exists, sites are already serviced, and location and infrastructure questions have largely been resolved. Speed is not a marginal advantage. In a system short of housing, it is a planning outcome in its own right.

Location: building where housing already makes sense

Many obsolete offices sit precisely where housing policy has long pointed — in city centres and established urban locations, close to transport, employment, and services. From a planning and infrastructure standpoint, this is alignment, not compromise. Delivering homes in these locations reduces the need for new infrastructure, limits urban sprawl, and supports the compact growth pattern that Ireland’s National Planning Framework has been trying to incentivise for years.

For McGrath Group, this is not theoretical. Several of our current pipeline assets sit within 400 metres of a Luas stop or DART station — locations that would carry a significant land premium if acquired today for a ground-up scheme.

Cost and viability: fewer levers available

Construction inflation, interest rates, and regulatory risk are material issues in ground-up development. Reuse does not eliminate risk — but it does change the profile. We’ve consistently found that conversion projects offer a lower exposure to build-cost inflation, reduced upfront capital requirements, and improved feasibility on marginal urban sites where ground-up numbers simply do not stack.

Where carbon properly fits into the decision

The carbon case for reuse is real — but it should be framed accurately rather than rhetorically. Lifecycle studies by the Carbon Trust and WRAP consistently show that retaining a building’s structural frame can preserve roughly 40–60% of embodied carbon, compared to demolition and rebuild, depending on the level of retention and quality of the existing structure.

Relative embodied carbon: reuse vs full demolition and rebuild (indicative, Carbon Trust data)

Two points matter in this framing. Embodied carbon is front-loaded — the emissions occur immediately at demolition and construction, not gradually over the building’s life. And those emissions cannot be recovered later through operational energy efficiency alone, no matter how well-insulated the new building. This does not mean every building should be reused. It does mean the carbon cost of demolition is a real, immediate trade-off that should be consciously weighed — not ignored because a new building will eventually perform better operationally.

The real constraint: regulation designed for new build

Ireland’s planning and building regulations are still largely geared towards new construction, not adaptation. As a result, reuse is assessed through frameworks not designed for it, demolition can be easier to justify than retention, and developers are forced into bespoke negotiations rather than clear, repeatable compliance pathways. This is not an argument for weaker regulation — quite the opposite.

What good regulation for reuse looks like

If reuse is to scale responsibly, it requires a dedicated regulatory framework. That means explicitly recognising reuse as a legitimate development pathway; applying non-negotiable fire, safety, and habitability standards; and allowing proportionate technical compliance without forcing demolition by default. The lesson from the UK and Netherlands is clear: reuse only works at scale when it is properly regulated and when developers can plan with certainty.

McGrath Group has been advocating for a clearer Irish framework through engagement with the Department of Housing, and we believe the moment for that reform is now — as a significant volume of Dublin office stock approaches the point of vacancy or lease expiry over the next 24 months.

A balanced opportunity

Office reuse is not a silver bullet. But in the right locations, for the right buildings, under the right rules, it can deliver homes faster, reduce cost and delivery risk, make better use of urban land, and avoid unnecessary embodied carbon loss. Speed, location, and viability make the economic case. Carbon reinforces it. What is still missing is a regulatory framework designed for that reality — and the political will to create one.