Joint First-Time Buyer Mortgage at 90% LTV: Two Public-Sector Professionals Buying a £435,000 Home in South London

Heron Financial arranged a £391,000 mortgage at 90% LTV for joint first-time buyers in South London, one working in education, the other in cultural heritage, purchasing a £435,000 two-bedroom semi-detached house with a £43,500 deposit from personal savings. With both applicants in publicly funded professional roles and the loan size firmly in the higher bracket for 90% LTV lending, the priority was placing the case with a lender comfortable on both income type and loan size. Heron Financial placed the case with NatWest on a fixed rate, and the mortgage completed in May 2026.

The clients

The clients were a couple buying their first home together in South London. One applicant works in education; the other works in cultural heritage, both established careers in publicly funded, mission-driven sectors, with steady PAYE incomes evidenced through payslips and P60s. They had saved £43,000 between them and were buying a two-bedroom semi-detached house at £435,000.

They came to Heron Financial in a position familiar to many London-area first-time buyer couples: a clean 10% deposit, two strong but not extravagant professional incomes, and a property price that, perfectly reasonable for the area, pushes the loan size into the higher bracket where lender policy on 90% LTV starts to vary.

The case at a glance

• Buyers: Joint first-time buyers, employed
• Nationality: British
• Occupations: Education professional + cultural heritage professional
• Property type: Two-bedroom semi-detached house
• Location: South London
• Purchase price: £435,000
• Deposit: £43,000 from personal savings (10%)
• Loan amount: £391,000
• LTV: 90%
• Lender: NatWest Intermediary Solutions
• Repayment method: Capital and interest
• Completion: May 2026

The challenge

A 90% LTV first-time buyer mortgage isn’t unusual, but stacked with a higher loan size on two public-sector incomes, the case sat in a part of the lender market that’s narrower than the headline rate tables suggest.
90% LTV at a £391,000 loan size. Several mainstream lenders cap their 90% LTV lending at lower loan sizes, allowing the LTV only up to £400,000 or £500,000 before tightening the cap to 85% or below. £391,000 is just under one of those common thresholds, but lender policy varies, and the case needed a lender genuinely comfortable lending close to this band at 90% LTV.

Joint affordability on two public-sector incomes. A £391,000 loan implies combined income of c.£87,000+ on standard 4.5x lending. Education and cultural heritage roles are typically PAYE, often unionised, with steady but not stretchy income growth. Both income types are well-treated by mainstream lenders, but the multiple available and the way any additional responsibilities (TLR payments, allowances, role uplifts) are counted varies.

Property type and value. A two-bedroom semi-detached house at £435,000 in South London sits comfortably within mainstream lender criteria. The property side of the case didn’t itself add complication; the focus was on the affordability and LTV combination.

A clean self-funded deposit. The full £43,000 came from personal savings, no family gift, no scheme, no incentive. That’s a strong position that simplifies the lender’s view of the deposit, even when the LTV is at the top of the band.

How Heron Financial approached the recommendation

The Heron adviser focused on three things: lender appetite at the loan size, joint affordability, and product fit for a first home.
Lender mapping for 90% LTV close to £400,000. Heron Financial narrowed the panel to lenders genuinely comfortable with 90% LTV lending in the £350,000–£400,000+ bracket. Not every advertised 90% LTV lender holds that LTV cap evenly across loan sizes.

Joint affordability check on PAYE income. The adviser confirmed how each shortlisted lender would treat the two incomes, basic pay plus any responsibility allowances or role uplifts, and confirmed the £391,000 loan sat comfortably within the chosen lender’s affordability rather than on the edge.

Lender choice. NatWest was the right home for this case. Their approach to PAYE income for joint employed couples, their handling of 90% LTV at this loan size, and their pricing at the band combined to produce the strongest overall outcome.

Product choice. A fixed rate gave the clients payment certainty in the early years of ownership. At 90% LTV on a meaningful loan, any rate change would be felt sharply on the monthly payment, so locking in the rate for a defined period was a sensible choice for a couple stepping into their first joint financial commitment of this size.

The outcome

The mortgage completed in May 2026. The clients moved into their first home together with:
A £391,000 mortgage at 90% LTV
A fixed rate on capital and interest repayment
A first home funded entirely from their own deposit
A clean placement at the top of the LTV band with a mainstream high-street lender

What this means for buyers in a similar position

If you’re a working couple in public-sector or charitable-sector roles, buying jointly in London or a higher-priced area, you’re not unusual, but you do need a broker who understands which lenders are genuinely competitive on your specific combination of income and loan size. Public-sector incomes are well-served by mainstream lenders; the catch is that not every 90% LTV lender holds that LTV cap at higher loan sizes. The lender market narrows quietly above £350,000 or £400,000 at 90% LTV, and the difference between the right lender and the wrong one can mean the case landing comfortably or not landing at all. Two clean PAYE incomes plus a 10% deposit is a strong position, it just needs placing properly.