Block of Flats Insurance Cost

The main rating factors

• Rebuild sum insured — the base of the calculation. Index linking alone lifts premiums each year.
• Number of units and floors — more households means more claims frequency and more liability exposure.
• Construction and roof type — brick and pitched tile rate differently to timber frame, single skin, concrete panel systems and flat roofs.
• Cladding and fire safety — unresolved cladding, missing EWS1 evidence or a waking watch can sharply reduce the number of insurers willing to offer terms.
• Location — flood zone, subsidence-prone clay, coastal exposure and local crime rates.
• Occupancy — owner-occupied blocks rate differently to student, short-term let or heavily tenanted buildings; ground-floor commercial units add trade-specific risk.
• Claims history over three to five years, with repeated escape of water the most common cause of loading.
• Excess levels and optional extras such as terrorism, engineering inspection, legal expenses and directors' and officers' cover.

Factors that can reduce the premium

• A professional rebuild cost assessment can stop the sum insured being set higher than the actual rebuild cost.
• Fixing the root cause of repeat leaks — old tanks, unlagged pipework, failing communal boilers — and evidencing the work.
• Up-to-date fire risk assessments, alarm servicing and lift inspection records.
• Cladding and remediation documentation supplied up front.
• A higher escape-of-water excess, provided the block's reserves could fund it if a claim happens.
• Starting the renewal four to six weeks early so a broker has time to market the risk.

Cost transparency for leaseholders

Since March 2024, freeholders, managing agents and brokers must disclose commission, share a summary of cover with leaseholders on request and be able to justify the policy as fair value. RTM and RMC directors who keep a clear record of the brokers approached and the terms obtained generally find service charge conversations easier.

Frequently asked questions

How much does block of flats insurance cost?

There is no standard price. Premiums are rated individually on rebuild sum insured, number of flats, construction, location, fire safety and claims history, so two similar-looking blocks can be priced very differently. We do not quote premiums — an FCA regulated specialist broker will confirm the cost once they have your building details.

What makes block insurance more expensive?

The biggest drivers are a high rebuild sum insured, non-standard construction such as timber frame or flat roofs, cladding or unresolved fire safety issues, flood or subsidence exposure, short-term or student occupancy, and repeated escape-of-water claims.

Why has my block insurance gone up at renewal?

Common reasons are index-linked increases to the rebuild sum insured, higher reinstatement costs across the construction market, claims in the last three to five years, and insurers reducing appetite for buildings with cladding or fire safety works outstanding.

How can leaseholders challenge the cost?

Since the FCA's multi-occupancy rules took effect in 2024, leaseholders can request a summary of cover, details of commission earned and information showing the policy provides fair value. Leaseholders can also raise service charge disputes through the appropriate tribunal.

Does a higher excess reduce the premium?

Usually yes, particularly on escape of water and subsidence. The trade-off is that the block must be able to fund the excess from reserves if a claim happens.

Is it cheaper to insure each flat separately?

Almost never, and most leases do not permit it. A single block policy avoids gaps between individual policies and disputes about which insurer responds to communal damage.