Doulton Bridging Finance
Guides — Shared Ownership Mortgage

Shared Ownership Mortgage Guide 2026 — How the Mortgage Is Calculated

Shared ownership mortgage guide 2026 — how the mortgage is calculated, staircasing, service charges, resale restrictions, which lenders accept shared ownership new build.

A shared ownership mortgage covers only the share of the property you purchase — not the full property value. This makes the deposit requirement and loan amount significantly lower than a full purchase. The mortgage works alongside a subsidised rent payment to the housing association on the share they retain. This guide explains exactly how the mortgage is structured, how affordability is assessed, and what happens when you want to buy more shares (staircase) or sell.

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5%
Minimum deposit on your purchased share (not full property value)
Mortgage + rent
Monthly costs: mortgage on your share + subsidised rent on remainder
Staircasing
Buy more shares over time — eventually own 100%
Lease
Shared ownership properties are leasehold — minimum 99-year lease standard
GUIDES — SHARED OWNERSHIP MORTGAGE

How the mortgage is structured

You take a mortgage on the share you purchase. 5% deposit on the share, mortgage covering the remaining 95% of the share value (85% LTV on the share is the standard maximum; higher with specific lenders). Monthly payments: mortgage payment (interest and capital if capital repayment, or interest only if IO) plus subsidised rent to the housing association on their retained share plus service charge (if applicable). The total monthly housing cost is mortgage + rent + service charge.

How rent on the retained share works

The housing association charges a subsidised rent on the share they retain. The rent is typically calculated at approximately 2.75% of the property value per year on the retained share. On a £300,000 property where you own 40% (£120,000) and the housing association retains 60% (£180,000): annual rent = 2.75% × £180,000 = £4,950. Monthly rent: £412.50. This rent typically increases annually — usually in line with RPI + 0.5% or similar, specified in the lease.

Staircasing and the remortgage

When you buy an additional share (staircase), you pay the housing association the market value of that share at the time of purchase. Your mortgage increases to cover the higher share. DBF arranges the remortgage at each staircasing event — adjusting the mortgage to reflect the new, higher ownership share. As you staircase, the rent on the housing association's retained share reduces (because they own less). At 100% ownership: rent disappears and you own the property outright as a standard freehold or leasehold owner.

Resale restrictions

Shared ownership leases typically give the housing association a first right of refusal to nominate another eligible buyer for 8–12 weeks before the property can be marketed on the open market. This can slow the sale process. The resale price is the market value of your share (not the full property value). If the housing association cannot find a buyer in the nomination period, you can sell on the open market to any eligible buyer (income cap may apply to the new buyer).

Shared Ownership Mortgage — Income Affordability Assessment August 2026

IncomeMax mortgage (4.5x)Affordable share (85% LTV, 5% dep)Full property value at this share
£30,000£135,000£142,105 share (mortgage £121,794)£355,263 (at 40% share)
£40,000£180,000£189,473 share£473,683 (at 40% share)
£50,000£225,000£236,842 share£592,105 (at 40% share)
£60,000£270,000£284,210 share£710,525 (at 40% share)
£70,000£315,000£331,578 share£828,946 (at 40% share)

Worked example

Shared ownership on £280,000 new build flat. Buying 40% share (£112,000).

  • 5% deposit: £5,600. Mortgage: £106,400.
  • Lender: Nationwide. Rate: 4.45% (2yr fix). Monthly mortgage: £533.
  • Rent on 60% share: 2.75% × £168,000 / 12 = £385/month.
  • Service charge: £180/month.
  • Total monthly housing cost: £533 + £385 + £180 = £1,098.
  • 4 years later: staircase to 70% (buy additional 30%).
  • Market value at staircasing: £310,000. Additional 30% = £93,000.
  • DBF remortgage: £106,400 original (reduced by capital repayment) + £93,000 = new total mortgage ~£193,000.
  • Rent reduces: 30% share retained by HA. 2.75% × £93,000 / 12 = £213/month.
  • New monthly: mortgage ~£1,020 + rent £213 + SC £180 = £1,413/month.
The Process

How it works

01

Tell us about your purchase

Share the property details, development, scheme type (Rate Reducer, MGS, shared ownership), and your deposit. We assess your situation same working day.

02

Lender search and scheme check

We identify which lenders accept your income type, development, and property classification — including Rate Reducer and MGS eligibility where relevant.

03

Application and valuation

We manage the full application, coordinate the RICS valuation, and liaise with the developer on build schedule and offer validity.

04

Mortgage offer and completion

Once the offer is issued, we monitor build progress, manage any extensions needed for off-plan delays, and coordinate completion.

FAQs

Frequently asked questions

How does the shared ownership mortgage work?

You take a mortgage on the share you purchase (e.g. 40% of a £280,000 property = £112,000 share). 5% deposit on the share = £5,600. Mortgage on the share = £106,400. Monthly mortgage payment plus subsidised rent to the housing association on their 60% retained share plus service charge.

Can I get an interest-only mortgage on a shared ownership property?

Some lenders offer interest-only shared ownership mortgages. This reduces the monthly payment but means you are not building equity through capital repayment. DBF advises on the most appropriate repayment structure for your financial goals.

What happens to my mortgage when I staircase?

When you buy additional shares, your mortgage increases to cover the higher share value. DBF arranges the remortgage at each staircasing event. As you staircase, the rent on the housing association's retained share reduces.

Can I sell a shared ownership property?

Yes — but the housing association has a first right of refusal to nominate an eligible buyer for 8–12 weeks. After the nomination period, you can sell on the open market. The resale price is the market value of your share at the time of sale.

Related finance

Explore related pages

Shared Ownership New Build Service Page

Shared ownership new build mortgage 2026 — buy 10%–75%, 5% deposit on share, staircasing explained. Income cap £80,000/£90,000 London.

New Build Mortgage for FTBs

New build mortgage for first-time buyers 2026 — 5% deposit routes, stamp duty relief, Own New Rate Reducer, LISA bonus. Approved Own New broker.

New Build Mortgage Guide

New build mortgage guide 2026 — LTV rules, all schemes, off-plan, EWS1, incentives, warranty, rates, deposit. Every question answered.

New Build Mortgages Hub

New build mortgages 2026 — specialist whole-of-market broker. Lower LTV, scheme expertise, off-plan offer validity, Own New Rate Reducer.

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