Rebuild cost assessments for apartment blocks in Ireland are a chartered surveyor’s estimate of what it would cost to demolish the whole building and rebuild it from the ground up to current standards, including professional fees and VAT.
That figure helps determine the buildings sum insured, and standard house rebuild calculators were never designed to produce it.
Whose job is it to get that number right? Responsibility generally rests with the owners’ management company, and the cost of getting it wrong can fall on every owner in the block.
An apartment block reinstatement cost assessment is the independent check on that number.

Who Insures an Apartment Block in Ireland?
The owners’ management company (the OMC) arranges the policy and owners fund it through their annual service charge, so the directors are buying cover with everyone’s money. The Housing Agency’s guide to insurance for multi-unit developments expects OMC directors to review their insurance needs every year, well ahead of renewal. The insured value is stated in the OMC’s annual report to owners, so any owner can ask when it was last checked.
Many OMCs use a managing agent for the paperwork and an insurance broker to find the cover. Neither is a substitute for a surveyor’s rebuild cost assessment.
The insurer works from the figure it is given, and a figure carried over from last year’s renewal is only as reliable as the one it started from. For older developments, the guide treats a regular independent assessment by a chartered building surveyor or quantity surveyor as best practice.
What the OMC insures depends on the lease, title documents and policy wording. That can be the common areas only, such as stairwells, corridors, lifts and car parks, or the whole building including the apartments, and mixed developments can split who insures what. If your block includes shops or offices, valuing commercial buildings for insurance covers the commercial side.
Does your block need an assessment? If the figure on the policy, known as the sum insured, was not set by a surveyor, or was set more than three years ago, an assessment is the safest way to check it, whether you sit on the board, manage the building or place the cover.

What Happens If an Apartment Block Is Underinsured?
Underinsurance is penalised through the average clause, where a policy applies one. It can reduce a claim in proportion to the shortfall. As the Society of Chartered Surveyors Ireland (SCSI) explains, a sum insured at 75% of the true rebuild cost may mean a claim paid at 75%, partial or total, depending on the policy terms and any excess.
In a block, the OMC is the policyholder, so any shortfall is the OMC’s to find, which in practice means the owners’. Picture a fire on a third-floor landing: the claim is valid and accepted, yet the payment can still arrive reduced because the block was insured below what it would cost to rebuild.

Why a House Calculator Fails for Apartment Blocks
The SCSI house rebuild calculator works for estate-type houses. SCSI says that it does not cover apartments, buildings of more than three storeys or basements, and it points apartment owners to their management company or agent for block insurance.
A rate built for a semi-detached house has no line for a lift shaft or a communal fire alarm system, so a figure assembled from house rates will not reflect the block’s real rebuild cost. Calculating a buildings sum insured shows where a calculator works and where it stops.
Market value fails for a different reason. It reflects land, location and buyer demand, while rebuild cost leaves the land out because it survives the fire.

What Rebuild Cost Assessments for Apartment Blocks in Ireland Include
A proper assessment, also called a reinstatement cost assessment or, loosely, a block insurance valuation, starts with demolition and site clearance, including debris removal and any hazardous materials such as asbestos, all of which can be shaped by access and other site constraints. Then comes the rebuild itself, from foundations to roof, priced at today’s materials and labour rates.
Apartment blocks include additional features that affect reinstatement costs, such as communal stairwells and lifts, plant rooms running shared mechanical and electrical (M&E) systems like heating and fire detection, basement car parks and boundary walls.
The rebuild must also meet current building regulations, including fire safety, and professional fees, other applicable charges and VAT sit on top of the construction cost.
The scope should match what the policy insures. Agree it with the surveyor at the start: common areas only, or the whole building including the apartments.

Which Surveyor Should Assess an Apartment Block?
The work should be done by a chartered building surveyor or quantity surveyor working to the professional standard for reinstatement cost assessments of buildings set by the Royal Institution of Chartered Surveyors (RICS). Look for a RICS-regulated surveyor, ideally an SCSI member, with experience of multi-unit buildings.
Choosing the insurer, the policy wording and the level of cover remains a matter for the OMC and its broker.

What Affects the Cost of an Apartment Block Assessment?
Fees are quoted per block, once the surveyor knows what they are dealing with. The drivers are storeys and floor area, age and type of construction, basements or car parks, the amount of shared plant, any mix of residential and commercial use, and how complete the drawings are.
The fee is typically met from the service charge and so shared across all owners. An assessment may also identify that the existing sum insured is higher than necessary. Overinsuring a block can raise the premium without raising what you recover, so an accurate number protects the budget in both directions.

How Often Should an Apartment Block Be Reassessed?
RICS recommends a full reassessment every three years, with an annual review in between to reflect inflation. A major refurbishment, extension, structural change or change to building services or communal installations brings the next on-site assessment forward.
Between on-site assessments, a desktop review is an update without a site visit. It is not a RICS-regulated on-site assessment and doesn’t replace one.
How long does a reinstatement cost assessment remain reliable? Treat it as a guide for up to three years, provided nothing significant has changed in the building or in construction costs. Renewal is the obvious time to check. Find the date of the assessment behind the figure.
Frequently Asked Questions
What is a rebuild cost assessment for an apartment block?
It is a surveyor’s estimate of what it would cost to rebuild the whole block after a total loss, including demolition, site clearance, professional fees and VAT. It’s an insurance figure, not a market valuation.
Is rebuild cost the same as market value?
No. Market value reflects land, location and buyer demand, while rebuild cost covers the building alone, including demolition, reconstruction, fees and VAT. An apartment block can be worth far more or far less than it would cost to rebuild.
Do I need a rebuild cost assessment for my apartment block?
If a surveyor didn’t set your sum insured within the last three years, an assessment is the safest way to check it. That goes for OMC directors, managing agents and brokers alike.
Who carries out a rebuild cost assessment?
A RICS-regulated chartered building surveyor or a quantity surveyor. Choose one with experience of multi-unit buildings.
How much does a rebuild cost assessment cost?
It depends on the size, age, construction and complexity of the block. Surveyors quote per building once they have the details.
Can I use a free online calculator for an apartment block?
Not reliably. Free tools such as the SCSI house rebuild calculator don’t cover apartments, so a block needs a surveyor’s assessment instead.
Does a block assessment include the individual apartments?
That depends on what the block policy insures under the lease. Agree the scope with the surveyor before work starts.
This article is for information only and does not constitute insurance or financial advice.

Book a Rebuild Cost Assessment for Your Apartment Block
A block is only as well insured as the number beneath it. If nobody can tell you when a surveyor last checked your block’s figure, the next renewal is the moment to find out whether it still holds.
Rebuild Valuation specialises in reinstatement cost assessment, and its on-site assessments are carried out by a RICS-regulated Chartered Building Surveyor, nationwide. If you’re ready to put a surveyor-checked number behind your block’s cover, you can book an on-site assessment through the enquiry form on this website or by calling the office.