A practical guide for serving personnel based at RAF Cranwell, Waddington and Coningsby, covering Forces Help to Buy, lender criteria, real Lincolnshire rental numbers, and the routes that actually work.
You’re posted at Cranwell, Waddington or Coningsby. You’ve got a few years left to serve. You’ve saved a deposit, and you’re starting to ask the question that goes around a lot of mess corridors: should I buy a property and rent it out while I’m in?
Maybe a friend in your unit has done it. Maybe a senior NCO has hinted that property is the smartest thing they ever did with their salary. Then you start looking online and the picture gets murky fast, Forces Help to Buy, buy-to-let mortgages, residential first, let-to-buy, stress tests, lender lists. It’s confusing, and it’s confusing in a way that costs people money.
This guide is written for serving personnel in Lincolnshire who are weighing up a buy-to-let. It’s not a sales pitch. It’s the same plain answers we give clients in our Sleaford office who turn up with the same question: how does this actually work?
Can you get a buy-to-let mortgage while serving?
Yes. Service personnel get buy-to-let mortgages every week of the year. The point is not whether you’re allowed to. The point is which lenders are happy with your circumstances and which will quietly decline you.
Most BTL declines for forces applicants don’t come from the property. They come from the application going to the wrong lender. A lot of mainstream BTL lenders write criteria that assume a salaried civilian with one fixed home address. Military life doesn’t tick that box. Lender choice is everything.
The basic checks are the same as for anyone else:
- A deposit of at least 20-25% of the purchase price, sometimes more
- A property the lender is comfortable with
- Rental income that passes the lender’s stress test
- A clean, well-presented application that fits their criteria
The difference is in how each of those gets interpreted when you’re in uniform.
Forces Help to Buy and buy-to-let: clearing up the £25,000 confusion
This is the single biggest source of wasted time we see. So let’s settle it.
Forces Help to Buy cannot be used to buy a buy-to-let property. The scheme’s rules are clear: the property must be one you intend to live in. The official guidance on gov.uk states FHTB is for buying your first home or moving to a new property because of an assignment.
So why do so many guides muddle the two together? Because there’s a real, useful overlap, but it works in a different direction:
- You can use FHTB to buy a residential home (your main home or near a posting)
- That home can later be let out, either by getting “consent to let” from your existing lender, or by remortgaging onto a let-to-buy product
- The end result is the same, you own a property earning rent, but the path is residential first, BTL later
If your goal is to own a rental property purely as an investment from day one, FHTB doesn’t help directly. You’d be looking at a standard buy-to-let mortgage, with your own deposit, in your own name (or through a limited company if it suits you).
The figures, for context:
- FHTB cap: 50% of annual salary, up to £25,000, gov.uk: Forces Help to Buy (last updated 9 January 2026)
- The scheme was made permanent in January 2023 after running as a pilot since 2014
- The advance is interest-free and repaid over up to 10 years
- Anything borrowed over £10,000 is treated as a benefit in kind for tax
If you want a deeper look at scheme limits, this article walks through the FHTB borrowing maths. For broader context on what the MOD offers, see this short piece on the forces mortgage scheme.
How lenders treat military income, postings and accommodation
When a BTL underwriter looks at a serving applicant, they’re checking three things on top of the usual:
- How your income is built up
- Where you live now
- How easy you are to keep track of over time
Income structure. Basic pay is straightforward. Where it gets interesting is the layered allowances, X-factor, Longer Service Increment, Specialist Pay, Local Overseas Allowance. Some lenders count all of it. Others count only basic pay. Where you sit on the band, and how recent your last promotion was, can shift the figure they’ll work with by thousands.
Service accommodation. If you’re in SFA or SLA and you don’t own a home elsewhere, some BTL lenders will pause. Their concern is “back-door” residential lending, they don’t want to lend BTL to someone who’s actually going to live in the property. A few lenders won’t lend on a BTL unless you already own your main home. Others are perfectly comfortable with serving applicants in service accommodation, as long as the case is presented properly.
Mobility. Your posting cycle is part of the story. A lender that’s relaxed about a 2-3 year posting pattern is a different lender from one that wants to see five years of address stability. The right answer is to apply to a lender whose criteria fit your career, not the one with the lowest headline rate.
This is where lender choice does most of its work. Get it right and the application is straightforward. Get it wrong and you’ve got a decline on your credit file that the next lender can see.
Let-to-buy: often the smarter route for service personnel
Here’s a pattern we see often. Someone uses FHTB and a regular residential mortgage to buy a home near their current posting. Two or three years later they’re posted elsewhere. They don’t want to sell, the area’s growing, they like the house, they may come back to it. So they need a way to keep it and let it out.
That’s let-to-buy. It’s a remortgage of your existing home onto a buy-to-let product. It frees you up to either move into service accommodation, buy a new main home, or both.
The advantages of this route for forces personnel:
- You used your residential allowance and FHTB exactly as intended
- You’ve got a property you know inside out, so no nasty surprises
- You’ve got a track record of paying the mortgage on it, which lenders like
- You’re treated as someone with a residential history, not a fresh BTL applicant
If you’re approaching a posting and thinking about this, get advice well before the posting date, ideally six months out. Some lenders need consent-to-let arranged before you move out. Others will only consider a full let-to-buy remortgage. Doing it in the wrong order can cause a six-month delay and a forced rental at a worse rate.
Lincolnshire rental numbers, what the local market actually looks like
Local data matters because lender stress tests run against the rent your property can really achieve, not the rent you hope it will. We’ve seen applications turned down because the assumed rent was 10% above what the surveyor signed off.
Here’s where the Lincolnshire market sits today:
Sleaford (North Kesteven local authority)
- Average private rent: £816 per month in January 2026, up 7.1% on the year, ONS North Kesteven housing data
- Average house price: £245,000 in December 2025, up 6.3% on the year, same ONS source
- Indicative gross yield range: 4-6%, Belvoir Sleaford analysis, November 2025
- Larger 4-bed family homes: £1,100-£1,300 per month based on current agent listings
- Carre’s Grammar School and Kesteven & Sleaford High School catchments support steady family demand
- Reasoning: ONS figures are the authoritative average across the whole North Kesteven district; Belvoir yield range adds the agent’s view; the 4-bed figure comes from current Rightmove and Zoopla listings
Lincoln, North Hykeham and surrounding villages (within easy reach of RAF Waddington)
- 2-3 bed homes typically £190,000 to £230,000
- Average rents £900 to £1,050 per month
- New-build estates around Skellingthorpe, Cherry Willingham (Taylor Wimpey) and Branston hold steady tenant demand
- Bracebridge Heath and Nettleham appeal to professional renters from RAF Waddington and Lincoln County Hospital staff
Boston and Grantham (commuter belts)
- Lower entry prices on some streets, £150,000 to £170,000
- Solid local tenant demand including contractor demand near A1 and A52 routes
- Useful for first-time landlords who want a lower-ticket starter property
UK and East Midlands comparison
- UK average private rent: £1,377 per month in March 2026, up 3.4% on the year, ONS Private rent and house prices bulletin, April 2026
- East Midlands average rent: £910 per month, up around 4.2% on the year, same ONS bulletin
- North Kesteven rent growth (7.1%) was running materially above both the regional figure (4.2%) and the UK figure (3.4%) at the latest reading
- The takeaway: Sleaford rents are well below the UK average in absolute terms, but they’re rising faster than national rents, a pattern that supports steady yield rather than spectacular yield
These numbers are a starting point, not a guarantee. Lender surveyors give the rental valuation that drives your application, and that figure is what your stress test runs on.
The stress test: what your rent actually needs to cover
Every BTL mortgage in the UK passes through an Interest Coverage Ratio (ICR) stress test. The framework comes from the Prudential Regulation Authority and has been in force since 2017.
In plain terms, the lender does this calculation:
- Takes a “stress rate”, typically 5.5% on a 5-year fix, often 7% or higher on a 2-year fix
- Works out what the interest would cost at that rate
- Checks the rent covers that interest by at least 125% (basic-rate taxpayer or limited company) or 145% (higher-rate taxpayer in personal name)
A worked example using realistic Lincolnshire numbers:
- Property: £180,000
- Loan: £135,000 at 75% LTV
- Stress rate: 5.5% on a 5-year fix
- Annual stressed interest: £135,000 × 5.5% = £7,425
- Monthly stressed interest: £618.75
- Rent needed at 125% ICR: £773 per month
- Rent needed at 145% ICR: £897 per month
So a £180,000 Sleaford terrace renting at £900 per month works at 125% ICR but is borderline at 145%. The structure of the application, personal name versus limited company, 2-year versus 5-year fix, exact LTV, moves the goalposts. This is the maths a broker is doing for you before you even put in an offer.
Source for stress test rules: PRA Supervisory Statement SS13/16, 2026 application figures.
Common mistakes, and how to avoid them
Five things we see that cost service personnel real money:
- Applying to the wrong lender. A decline stays on your credit file for the next lender to see. The first application should be the right one.
- Confusing FHTB with a BTL deposit. FHTB is for residential. Six weeks spent chasing this misunderstanding is six weeks you can’t get back.
- Using optimistic rental figures. The surveyor decides, not the asking price on Rightmove. Use realistic rents in your stress test from the start.
- Applying without thinking about service accommodation. Some lenders treat SFA and SLA neutrally, others don’t. Choose accordingly.
- Leaving let-to-buy too late. Approaching a posting with no plan for an existing residential mortgage means you may be forced into a fire sale.
Where to go from here
If you’re at a stage where you’re seriously thinking about a buy-to-let, whether that’s a fresh purchase, a let-to-buy on your current home, or a strategy that works around a posting that’s coming up, the right next step is a 30-minute conversation with someone who’s done this before for service personnel.
We’re based in Sleaford. We work with applicants from Cranwell, Waddington and Coningsby every month. We won’t push you into something that doesn’t fit. If you’re better off waiting six months, or buying differently, we’ll tell you. Talk to an adviser when you’re ready.
For service-specific reading, you might want to look at next:
- BTL service page, our main buy-to-let advice page
- Let-to-buy mortgages, for keeping your home and renting it out after a posting
- FHTB mortgages, for the residential side of forces home ownership
- FHTB borrowing limits, what you can actually borrow on the scheme
- Armed Forces scheme, short overview of MOD support
FAQs
Can I use Forces Help to Buy as a deposit on a buy-to-let? No. Forces Help to Buy is for a property you intend to live in. If your goal is a pure buy-to-let from day one, you’ll need a separate deposit and a standard BTL mortgage in your own name or through a limited company.
Do BTL lenders mind that I’m in service accommodation? Some do, some don’t. Lenders that won’t lend BTL unless you already own a residential home are common but not universal. A broker who works regularly with serving personnel will go straight to lenders that are comfortable with SFA and SLA applicants.
What deposit do I need for a buy-to-let in Lincolnshire? Most lenders ask for at least 20-25% of the purchase price. On a £180,000 property in Sleaford that’s £36,000 to £45,000. Some specialist lenders will go higher LTV, but rates rise sharply and stress tests get harder to clear.
What happens to my BTL if I’m posted abroad? You can usually keep the mortgage, but you must tell your lender. Some BTL lenders are fine with overseas postings; others require you to remain UK tax-resident. This is a question worth asking before you apply, not after.
How quickly can I get a decision? A decision in principle can come back in days once your paperwork is together. A full mortgage offer typically takes 3-5 weeks for a clean case. More involved cases, limited company, multiple properties, overseas posting, can take longer.
This article is written and reviewed by the mortgage advisers at Spolton Mortgages, an FCA-regulated mortgage broker based in Sleaford, Lincolnshire. We work with serving personnel from RAF Cranwell, Waddington and Coningsby on residential, buy-to-let and let-to-buy mortgages every week. Mortgage availability depends on income, credit history, deposit and lender rules at the time of application. Your home may be repossessed if you do not keep up repayments on your mortgage. Not all buy-to-let mortgages are regulated by the Financial Conduct Authority.
