Portfolio Insurance: Multi-Property Policy Benefits

Portfolio insurance is there to cut admin and shave maybe 15-30% off your total premium, but you have to get rebuild values and disclosure right or you risk under-insuring everything in one go.

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1. What portfolio insurance is and how it works

Portfolio (multi-property) landlord insurance:

• Single policy covering several properties (often residential, sometimes mixed with commercial) instead of one policy per unit.
• You have one premium, one renewal date, one point of contact.
• You give the broker/insurer a schedule of properties: address, type, rebuild value, tenant type, etc., and they all sit under one umbrella policy.

Adjustments

• When you buy or sell a property, you do a mid-term adjustment:
• Add a new property (they charge an additional premium pro-rata).
• Remove a sold property (they refund pro-rata, sometimes with a small charge).
• Good portfolio policies allow unlimited mid-term changes without admin fees.

You still specify cover per property (buildings, contents, rent, tenant type); it is not a single blended sum unless you explicitly structure it that way.

2. Savings, providers and minimum portfolio size

Typical savings

Brokers and comparison sites consistently say portfolio insurance can save around 15-30% compared to multiple standalone policies:

• Cover4LetProperty: the more properties you add, the cheaper per property.
• Superscript: offers up to 17.5% multi-property discount on residential properties, approx 5% on commercial.
• Direct Line for Business: minimum 25% discount on each property (except the highest-priced one) when you add multiple properties.

Minimum portfolio size

Many specialist brokers talk about 3-5 properties as the point where multi-property becomes worthwhile:

• Alan Boswell: portfolio/multi-property cover is "designed for landlords with five or more properties".
• Some like CIA, Superscript or Direct Line will do multi-property from three properties upwards, sometimes even two, but the admin saving is marginal at that size.

Key providers (2025-26)

• Alan Boswell Group - multi-property landlord insurance, unlimited properties, residential and commercial, no mid-term amendment fees.
• Just Landlords - "multi-property insurance" covering private lets, holiday homes, holiday lets and second homes.
• Total Landlord Insurance - portfolio cover for 15+ properties online, more via phone.
• Direct Line for Business - up to 15 properties (residential and commercial) on one policy with multi-property discounts.
• CIA Landlords, Superscript, UKinsuranceNET, Adrian Flux - active in the portfolio space.

Typical costs

• Standard single BTL on its own: often GBP 150-300/year.
• In a portfolio of, say, 5-10 mixed BTLs, HMO and maybe a small commercial, the per-unit cost can drop 15-30% through multi-property discounts and admin efficiencies.

3. Mixed portfolios, rebuild values and key risks

Mix of property types

Good portfolio policies can mix:

• Residential BTL houses and flats.
• HMOs.
• Holiday lets / short-lets.
• Commercial units and mixed-use (shop with flats above).

Alan Boswell explicitly markets "all property types covered" including commercial and residential in one policy. Superscript and Direct Line both advertise mixed commercial/residential multi-property cover.

You must still disclose each type accurately (HMO vs single let, holiday let vs standard AST, commercial vs residential) and accept that some risk classes might be rated differently within the same portfolio.

Rebuild values across the portfolio

You still need a realistic rebuild figure per property, not just "market value divided by X".

Best practice:

• Use BCIS calculators, recent RICS valuations or broker tools to estimate per-property rebuild.
• Review sums insured every 1-3 years, especially after extension/refurb.

Portfolio risk: if you under-insure several properties, a big claim at one may trigger "average" across that risk section, leaving you paid only a percentage because the whole section was under-insured.

Claims history "contamination"

Main downside of portfolio cover:

• One bad property's claims (for example repeated leaks, ASB, fires) hit the claims history for the entire portfolio, which can drive up renewal pricing on all units.
• With separate policies, a problematic HMO does not directly affect the pricing on a completely separate single-let policy (though underwriters can still see your general history).
• With a portfolio, you may be tempted to "keep" a dog of a property for the discount when actually it is dragging the whole portfolio's risk profile up.

4. What forums get wrong

Persistent misconceptions:

"Portfolio insurance just bundles policies; no real saving." Reality: documented multi-property discounts of 15-30% per property are standard once you hit 4-5+ units.

"You must have 10+ properties before it is worth it." Alan Boswell pitches portfolio cover from five properties; CIA, Superscript and others see benefit from three or four.

"You can put anything on one policy; they do not care about type." Mixed portfolios are fine in principle, but you must disclose:

• HMO vs single let.
• Student vs professional vs UC tenants.
• Holiday lets vs standard ASTs.
• Commercial vs residential.

Mis-categorising to get a cheaper blended rate is a gift-wrapped non-disclosure argument for the insurer.

"If I am under-insured on one house, it only affects that house." Many portfolio structures still apply average at risk-section level. If a whole block of properties is under-insured by 20%, you may only get 80% of any claim on that section, not just the one that burned.

"One big policy means the broker will sort sums insured for me." They help, but the legal responsibility for giving accurate sums insured and property details is still yours. A nice "portfolio discount" does not fix under-insurance or mis-description.

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