Over the past few years, I’ve watched the UK apartment market shift in ways that make choosing the right flat together with a partner or housemate more complicated than it used to be. Apartments now account for roughly 22% of all new build completions in England, up from 18% in 2022. That means more of us are living in flats than ever before, and the decisions you make together about which one to buy or rent have a direct impact on your finances, your daily life, and your future plans. I’ve covered this space long enough to see the same patterns repeat: couples and friends who rush into a decision based on location alone, only to discover six months later that the service charges are eating their budget or the lease terms lock them into something they can’t change. Here’s what you actually need to know.
If you’re looking at flats together, the first thing to understand is that the numbers above aren’t just abstract figures. The average new build flat price of £298,500 is about £70,000 less than the average new build house, which makes apartments a more accessible entry point for first-time buyers. But that saving can disappear quickly if you don’t account for service charges, ground rent, and the other ongoing costs that come with flat ownership. A smart leak detector like the X-Sense Wi-Fi Water Leak Detector can help you avoid expensive water damage claims, but it won’t fix a budget that didn’t account for a £4,500 annual service charge.
What “choosing together” actually means for your finances
The most important implication of buying a flat with someone else is that your combined finances are now tied to a single asset with shared liabilities. If one of you loses income, the mortgage still needs paying. If you split up, selling a flat is more complicated than walking away from a rental. The English Housing Survey for 2024-25 shows that owner occupation has stabilised at 65% of households, but the private rented sector has doubled since the early 2000s. That means more people are renting together before they buy together, and the transition from renting to owning as a pair comes with legal and financial steps that many overlook.
My first move when helping friends think through this is always the same: sit down and write out what happens if one person wants to sell and the other doesn’t. It sounds uncomfortable, but it’s the single most important conversation you can have. A property lawyer can help you draft a co-ownership agreement that covers this scenario, and it’s money well spent before you exchange contracts.
Why the city you choose changes everything
The apartment market is not the same across the UK. In London, flats account for 58% of all new build completions, and the average price is £485,000. In Manchester, that figure drops to 45% and £265,000. In Birmingham, it’s 38% and £238,000. These differences matter because they affect not just what you can afford, but what kind of rental yield you can expect if you ever decide to let the property out. Gross rental yields for apartments range from 5.2% to 6.8% nationally, but in Glasgow they can hit 7.5%, while in London they tend to sit at the lower end of that range.
What I tend to notice is that couples often fixate on the headline price without considering the pipeline of new developments in their chosen city. London has 52,000 units in the pipeline, Manchester has 18,500, and Birmingham has 12,200. A large pipeline can mean more choice and potentially better prices, but it can also mean oversupply in certain areas, which affects resale value. If you’re buying together with a plan to sell in five years, you want to be in a city where demand is growing faster than supply. Smart strategies for buying apartments in the UK often start with understanding local supply dynamics before you even view a property.
Where people go wrong when choosing a flat together
Ignoring service charges until it’s too late
Service charges for apartments run between £1,800 and £4,500 per year, compared to £0–£500 for houses. That’s a difference of up to £4,000 annually. I’ve seen couples fall in love with a development’s gym and concierge, only to realise later that those amenities are funded by service charges that rise every year. The fix is simple: ask for the last three years of service charge accounts before you make an offer. If the charges have been increasing faster than inflation, that’s a red flag.
Overlooking the lease length
A short lease can make it difficult to get a mortgage and harder to sell later. Anything under 80 years is considered short, and extending a lease costs money and time. If you’re buying together, you need to agree on what lease length is acceptable before you start viewing. A real estate lawyer can check the lease terms and flag any issues before you commit.
Not checking the fire safety paperwork
Since the Grenfell tragedy, fire safety has become a major issue for flat buyers. Many lenders now require an EWS1 form (External Wall System Fire Review) before they’ll approve a mortgage on a high-rise flat. If the building doesn’t have one, or if the form comes back with a rating of B2 or B3, you may not be able to get a mortgage at all. Understanding fire escape regulations when apartment hunting is essential, and it’s something you should verify before you make an offer.
Assuming build-to-rent is the same as buying
Build-to-rent (BTR) now accounts for 34% of all new build apartment completions, up from 22% in 2022. These developments are designed for renters, not owners. They often have different lease structures, shorter tenancies, and fewer rights to make changes to the property. If you’re buying together, make sure you’re looking at properties designed for owner-occupiers, not BTR blocks that are being sold off to investors.
→ Scroll right to see all columns
| City | Average Flat Price | Pipeline (units) | Gross Rental Yield |
|---|---|---|---|
| London | £485,000 | 52,000 | 5.2–6.5% |
| Manchester | £265,000 | 18,500 | 5.5–6.5% |
| Birmingham | £238,000 | 12,200 | 5.8–6.5% |
| Glasgow | £175,000 | 6,200 | 6.0–7.5% |
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How to choose the right apartment together: a practical guide
Agree on your budget before you view anything
This sounds obvious, but I’ve seen couples waste months looking at flats they can’t afford because they never had the conversation about what “affordable” actually means. Start with your combined income, then subtract your existing debts and monthly outgoings. A mortgage lender will typically lend up to 4.5 times your joint income, but that doesn’t mean you should borrow the maximum. Factor in service charges, ground rent, buildings insurance, and a maintenance fund for unexpected repairs. If you’re both first-time buyers, remember that features that actually boost property value in the UK — like good transport links and energy efficiency — should be prioritised over cosmetic upgrades you can change later.
Decide on the legal structure of your ownership
As I mentioned earlier, joint tenancy and tenancy in common are the two main options. If you’re contributing unequal deposits, tenancy in common lets you protect your share. If you’re married or in a civil partnership, joint tenancy is usually simpler. Either way, you need a solicitor to draft the paperwork. A estate lawyer can also advise on what happens to the property if one of you dies, which is an uncomfortable topic but a necessary one.
Check the building’s management and maintenance history
A well-managed block is worth paying a bit more for. Ask about the managing agent, how often the common areas are cleaned, and whether there’s a sinking fund for major repairs. If the building has a history of disputes between leaseholders and the freeholder, that’s a warning sign. You can request the minutes from the last few annual general meetings of the residents’ association to get a sense of how the building is run. A small claims lawyer can help if you end up in a dispute, but it’s better to avoid that situation entirely by doing your homework upfront.
Think about the future, not just the present
Are you planning to have children? Will you need more space in five years? Is the flat in a area that’s likely to appreciate? These questions matter because selling a flat costs money — estate agent fees, legal fees, and stamp duty on your next purchase. If you’re buying together, you should have a rough timeline in mind. Even if you don’t stick to it, the conversation forces you to think about whether the flat you’re choosing today will still work for you in a few years. Modern apartments with smart tech and sustainable features tend to hold their value better and appeal to future buyers, which is worth considering even if you plan to stay put.
- 1Calculate your combined affordabilityUse a mortgage calculator with your joint income, existing debts, and estimated service charges. Don’t forget to include stamp duty and legal fees in your upfront costs.
- 2Choose your ownership structureDecide between joint tenancy and tenancy in common based on your deposit contributions and future plans. A solicitor can formalise this.
- 3Verify the building’s paperworkRequest the EWS1 form, lease details, service charge accounts, and sinking fund information before you make an offer.
- 4Plan your exit strategyDiscuss what happens if one person wants to sell, if you separate, or if your circumstances change. Put it in writing with a co-ownership agreement.
Frequently asked questions about choosing an apartment together
Can we buy a flat together if one of us has bad credit? ▾
What happens to the flat if we split up? ▾
Is it better to buy a new build or an older flat? ▾
How do we split the deposit if we’re contributing different amounts? ▾
What if we want to rent the flat out later? ▾
Choosing the right apartment together comes down to three things: honest conversations about money, thorough checks on the building and lease, and a clear plan for what happens if things change. Start with the budget conversation this week, even if you’re not ready to buy yet. If this was useful, you might also want to read Decode the UK property market: 5 flat buying myths debunked.
Sources and Further Reading
Apartment buying in the UK: are you making these 5 deadly mistakes? — A closer look at the most common errors buyers make and how to avoid them.
New Build Apartment Market Trends and Buyer Preferences. New Builds UK, 2025.
English Housing Survey 2024-25: Chapter 1 — Profile of Households and Dwellings. UK Government, 2025.
2026 UK Property Market Guide: A to Z of Buying, Selling and Renting. House & Garden, 2025.
