How to Save a House Deposit Faster in a High-Rent City

Saving a deposit while paying rent is one of the most common - and most difficult - financial challenges facing first-time buyers, particularly in high-cost cities where rent alone can absorb most of a household’s spare income. Here’s the current picture and the levers that genuinely help.

The scale of the challenge, in current figures

• Average first-time buyer age in the UK: around 33.9 years - up considerably over the past decade, and around three years older than in 2015.
• Average first-time buyer house price (January 2026): £226,000 nationally, rising to £472,000 in London specifically.
• Average first-time buyer deposit: estimates range from roughly £54,000 to £63,000 depending on the data source and year, representing around 20% of the purchase price nationally - with London deposits running considerably higher than the national average.

Different surveys give somewhat different figures depending on methodology and timing, but the consistent picture is that deposits well into five figures - and considerably more in London and the South East - are now typical for first-time buyers.

Why saving while renting is uniquely hard

Unlike someone living at home, a renter is simultaneously paying for their current housing and saving for their next one - meaning a much larger share of income is committed before any deposit-saving begins. This is precisely why deposit-specific savings tools matter more for renters than for people without this dual cost.

The single most valuable tool: the Lifetime ISA

A Lifetime ISA lets savers aged 18–39 contribute up to £4,000 a year with a 25% government bonus (up to £1,000 a year) added on top - a bonus that applies specifically well to first-time buyers, since it can be used penalty-free toward a first home costing £450,000 or less (see our dedicated LISA article for the full rules, including its frozen property cap and a major reform currently in consultation). Opening one as early as possible maximises the number of years the bonus compounds.

Government and lender schemes worth checking

• Mortgage Guarantee Scheme and 95% mortgages, which reduce the deposit needed to 5% of the purchase price rather than the more traditional 10–20%, though usually at a higher interest rate than larger-deposit deals.
• Family-assisted mortgages (guarantor mortgages, family deposit schemes, or products like ‘joint borrower sole proprietor’ mortgages) that use a family member’s savings or income to boost borrowing power without them needing to gift cash outright.
• Shared ownership schemes, which let you buy a percentage of a property (commonly 25–75%) and pay rent on the remainder - a lower deposit entry point, though with its own trade-offs around future costs of staircasing to full ownership.

Practical ways to accelerate saving specifically while renting

• Track exactly what rent-related costs will disappear once you own (though remember new costs - buildings insurance, maintenance, potentially service charges - will replace them) to build a realistic post-purchase budget alongside your deposit target.
• Use a regular saver account for consistent monthly deposit-building at a higher rate than easy access typically offers (see our dedicated article on how these work), provided the term suits your house-buying timeline.
• Layer in round-up saving on everyday card spending to add small, unnoticed amounts on top of your deliberate monthly contributions - modest individually, but a genuine boost to the deposit timeline over a year or more.
• Consider whether a house move to a lower-rent area, even temporarily, meaningfully accelerates your saving rate - this is a significant lifestyle decision, but can be transformative for deposit timelines in the highest-rent cities.
• Check whether family gifts count toward your deposit - research from Savills found that over half of first-time buyers (52%) receive some help from parents, and lenders have specific requirements for how gifted deposits must be documented.

The bottom line

Saving a deposit while renting in a high-cost city is a genuinely harder problem than general savings advice often acknowledges - but a Lifetime ISA opened early, combined with realistic use of lower-deposit mortgage schemes and, where available, family support, meaningfully changes the achievable timeline.