Comparison · 2026/27
Shared Ownership Rent vs Market Rent
Shared ownership rent, charged only on the share of a home you do not yet own, is often assumed to always beat renting the same property outright. In practice the true comparison needs to include your mortgage and service charge alongside the rent element. This guide breaks down how each is calculated and what genuinely differs.
At a Glance
| Feature | Shared Ownership Rent | Market Rent |
|---|---|---|
| Basis | % of unsold share value | Whatever the market will pay |
| Cap | Usually up to 3%/year | No statutory cap |
| Also pay mortgage? | Yes, on owned share | No |
| Service charge | Separate, billed directly | Bundled into rent |
| Builds equity? | Yes, on owned share | No |
| Exit process | Sell share, nomination period | Give notice |
How Shared Ownership Rent Is Calculated
The housing association or developer charges rent only on the percentage of the home you do not yet own, typically capped at up to 3% of that unsold share\'s current value per year, split into monthly payments. If you own 40% of a £300,000 home, rent applies to the remaining £180,000 share — around £5,400 a year, or £450 a month, at a 3% cap.
Rent is reviewed annually, usually rising with RPI (or CPI in some newer leases) plus a small additional percentage, so it grows over time in a broadly predictable way. Buying further shares (staircasing) directly reduces the unsold percentage and therefore the rent — reaching 100% ownership removes the rent charge entirely, leaving only the mortgage and any applicable ground rent or service charge.
What You Actually Pay in Total
Comparing shared ownership fairly against market rent means adding together three elements: the mortgage repayment on the share you own, the rent on the unsold share, and the service charge for building insurance and communal maintenance. Only the combined total is genuinely comparable to a single, all-in private market rent figure for the same property.
In a low mortgage-rate environment with modest service charges, the combined figure is usually lower than market rent, and the mortgage portion also builds equity — a benefit renting never provides. In a high mortgage-rate environment, or with a high service charge (common in new-build developments with lifts, concierge or extensive communal facilities), the combined monthly outgoings can sometimes match or exceed local market rent, even though the rent element alone looks cheap.