A house converted into two flats but registered as a single freehold title creates complications for buyers, mortgage lenders, and solicitors. Two routes are available: split the title into separate leases first, or sell the whole property as one. This guide covers both.
A Victorian or Edwardian terraced house that has been divided into a ground-floor flat and a first-floor flat is a common type of property in many UK cities. In many cases these conversions happened decades ago, and the owner at the time simply continued to hold the freehold title to the whole house, without ever creating separate leasehold titles for each flat.
This creates a problem when it comes to selling. Mortgage lenders will not lend on a flat that does not have its own registered leasehold title. A buyer for the ground-floor flat using a mortgage cannot proceed if the flat is not a separately registered leasehold, even if the conversion is perfectly sound structurally and the flats have always been let or occupied separately.
The result is that you typically cannot sell each flat individually to a mortgage-backed buyer unless you first create separate leases. Without doing that, two routes remain: sell the whole property as a single freehold title to a single buyer, or sell to a cash investor or developer who can accept the unusual title structure and either hold the property as one or split it themselves after purchase.
This guide covers both routes, the legal mechanics of splitting the title, the planning and building regulations position, the costs and timing, and who the realistic buyers are.
Your Two Main Options
Each route has different costs, timescales, buyer pools, and net proceeds. Both are valid; the right choice depends on your circumstances.
Option 1: Create Separate Leases, Then Sell
A solicitor drafts two long leases (typically 99 to 999 years), one for each flat, which are registered at HM Land Registry. Each flat then has its own leasehold title and can be sold individually to mortgage-backed buyers at full market value. This route takes longer and costs more upfront, but typically yields a higher total proceeds than selling the property as one.
Best for: sellers who want the highest total price and are prepared to invest several months and £4,000 to £10,000+ in legal and compliance work upfront.
Option 2: Sell the Whole as One Freehold
Sell the entire property, both flats under one freehold title, to a single buyer. The buyer will typically be a cash investor, property developer, or experienced landlord who intends to either create leases themselves after purchase or use the building as a buy-to-let. Simpler, faster, and lower upfront cost, but usually achieves a lower total proceeds than selling the flats separately.
Best for: sellers who want speed and certainty, do not want to manage the splitting process, or where the conversion has planning issues that would slow the splitting route significantly.
What Splitting the Title Involves
Creating separate leasehold titles from a single freehold is a legal process carried out by a solicitor with experience in title splitting. Done properly, it produces two cleanly registered leasehold titles, each individually saleable and mortgageable.
The four-step process
1. Instruct a solicitor. A solicitor experienced in title splitting drafts the two leases. Typical lease terms are 99, 125, or 999 years. The leases need to clearly define the extent of each flat, the shared parts (entrance hall, stairs, roof), and the obligations of each leaseholder.
2. Hire a surveyor. A RICS surveyor produces accurate floor plans and measurements for each flat, which become part of the lease. This is essential for the Land Registry to register the two leases without boundary disputes later.
3. Register the leases at HM Land Registry. The solicitor lodges the two leases for registration. Each new leasehold title gets its own title number and can then be dealt with independently.
4. Decide what happens to the freehold. The freehold title still exists and now sits over both leasehold flats. You can retain it (becoming the landlord), transfer it to a management company jointly owned by the leaseholders, or sell it separately. See "What happens to the freehold" below.
What goes into each lease
Each lease defines the extent of the flat (the demised premises), the rights granted (to use shared parts, drainage, services), the obligations of both leaseholder and freeholder (repairs, insurance, service charges), and any restrictions (pets, alterations, subletting). Standard lease provisions also cover ground rent (typically a peppercorn or low fixed amount), the term, and how the lease can be enforced or extended in future.
Get this right at the splitting stage. A poorly drafted lease can cause problems for buyers' solicitors and lenders later, sometimes requiring deeds of variation to fix. A specialist leasehold solicitor is worth the cost.
Planning Permission, Building Regs, and Fire Safety
The conversion of a single house into two self-contained flats is a material change of use that requires planning permission. The construction work also requires building regulations approval. If either was not obtained at the time of the conversion, the property has a planning or building-control issue that needs addressing before a clean mortgage-backed sale is possible.
Planning permission options if not obtained
Certificate of Lawfulness for Existing Use (CLEUD): If the conversion has been used as two separate flats continuously for at least four years, you can apply to the local planning authority for a Certificate of Lawfulness. This effectively confirms that the use is now immune from enforcement and treats it as lawful for property purposes. Typical cost: a few hundred pounds plus solicitor support.
Retrospective planning permission: If the conversion is more recent or the four-year rule does not apply, retrospective planning permission may be needed. This is a normal planning application: the local authority can refuse, in which case the conversion may need to be undone or further modified.
Indemnity insurance: A short-term workaround. An insurance policy provides cover against enforcement action being taken in the future. Often acceptable to mortgage lenders and buyers' solicitors, though not all lenders accept it. Usually a one-off premium of a few hundred pounds.
Building regulations
Separate from planning. The conversion work itself (creating fire-resistant separation between the two flats, sound insulation, safe means of escape, separate utilities) should have had building regulations approval. Without it, a buyer's solicitor may not be able to certify the title to the lender's satisfaction. A regularisation certificate can sometimes be obtained retrospectively from the local building control body, depending on what was actually done.
Fire safety
Modern fire-safety expectations apply to all flats. Each flat needs adequate fire separation from the other (typically FD30-rated fire doors and 30-minute fire-resistant compartmentation), interlinked smoke alarms in both flats and any shared escape route, and a clear means of escape from each flat. A Fire Risk Assessment (FRA) for the building may be required by buyers' solicitors and is required by the Regulatory Reform (Fire Safety) Order if the building has any common areas. Where the existing conversion does not meet current fire-safety standards, remediation work may be needed before a mortgage-backed sale.
A solicitor experienced in title splitting will identify what is needed for your specific property at the start, before you commit to the splitting process. If significant remediation is required, the cash-investor route (Option 2) may produce a better net result than splitting first.
Costs of Splitting the Title
The total cost of splitting depends heavily on whether the original conversion was done with proper planning permission and building regulations approval. A clean conversion costs much less to split than one that needs retrospective regularisation.
Splitting and lease creation costs
Solicitor fees (drafting and registering two leases): £2,000 to £5,000 plus VAT. More for complex cases or where bespoke lease provisions are needed.
Surveyor fees (floor plans and boundary measurements): £500 to £1,500.
Land Registry fees: based on the value of each flat; typically a few hundred pounds in total for two leases.
Disbursements and miscellaneous: office copies, search fees, ID checks, typically £100 to £300.
For a clean conversion with no planning issues, the total cost of splitting is usually in the range of £3,000 to £7,000.
Additional compliance costs (if needed)
Certificate of Lawfulness: a few hundred pounds in fees plus solicitor support.
Retrospective planning application: several hundred to over a thousand pounds, depending on complexity.
Indemnity insurance: typically £200 to £600 as a one-off premium, depending on the property value and the issue insured.
Building regulations regularisation: varies widely. Where the work was done to a good standard, a few hundred pounds for inspection and certification. Where remediation is needed, costs can run into thousands.
Fire safety remediation: upgrading fire doors, fire separation, and alarms can cost £2,000 to £10,000+ depending on what was originally installed.
Where significant compliance work is needed, the total cost of preparing the property for a mortgage-backed sale can rise to £10,000 to £20,000 or more. At that level, the financial case for splitting and selling individually starts to look closer to the as-one route, particularly for lower-value properties.
How Long Does It Take?
Realistic timelines depend on the route chosen and on whether the conversion already complies with planning and building regulations. Plan for the longer end of each range if any planning regularisation is needed.
Direct cash buyer (whole property as-one): 3 to 6 weeks from instruction to completion. The buyer takes on any future splitting work themselves.
Auction (whole property as-one): 4 to 8 weeks total. Marketing for 3 to 4 weeks, then completion within 28 days of the hammer falling. Often suitable for properties with planning or title complications.
Estate agent (whole property as-one): 8 to 16 weeks. Investor-led market; longer fall-through risk than a typical sale because the buyer pool is narrower.
Split first, then sell separately on the open market: 2 to 6 months for the splitting (including any planning regularisation), then 8 to 16 weeks for each flat sale. Total: 5 to 9 months minimum, sometimes longer if planning issues are extensive.
The most common cause of delay is planning or building-control regularisation. If the conversion was done long ago and never properly approved, getting the position fixed can take months. In some cases the local authority will take a positive view (Certificate of Lawfulness for an old conversion); in others it will not. An early planning enquiry pays back many times over by clarifying which route is realistic.
Who Buys These Properties?
The buyer pool for an unsplit two-flat property is narrower than for a single-flat sale. Understanding who realistically buys helps you target the right marketing channel and price accordingly.
Cash investors and buy-to-let landlords. Experienced investors who buy unsplit properties knowing they may need to split the title later (or hold as one and let both flats). They expect a discount that reflects the legal work and risk they take on. Typical offer: 10 to 20 per cent below the post-split combined value, sometimes more where compliance work is needed.
Property developers. Buyers with experience of refurbishment and lease creation. May add value by both refurbishing the flats and splitting the title, then reselling. Look for properties where there is genuine uplift available, not just a clean split.
Auction buyers. Mostly experienced investors comfortable with title and planning complications. Auction is well suited to unsplit two-flat properties because the legal pack discloses the position upfront and bidders price it in calmly. Sales complete within 28 days of the hammer.
Specialist quick-sale buyers. Direct cash buyers, including Sell Flat UK, who buy properties with title or planning complications. Price below open-market value, in exchange for speed (3 to 6 weeks typical) and certainty.
Less likely: owner-occupiers. Most owner-occupier buyers want a single flat with its own lease and a mortgage. They are not the realistic buyer for an unsplit property, though occasionally a buyer wanting to buy the whole house and live in one flat while letting the other will appear.
The investor discount is the practical reality of the as-one route. A serious investor will model the post-split combined value, deduct the cost and time of splitting and any compliance work, deduct their target profit margin, and offer the residual. That is why splitting first usually produces a higher total even after accounting for the seller's own splitting costs, the seller is keeping the investor's profit margin for themselves.
What Happens to the Freehold After You Split
If you go the splitting route, the freehold title still exists and continues to sit over both leasehold flats. You need to decide what to do with it. Three common approaches:
1. Retain the freehold yourself
You become the landlord (freeholder) of the building, with both flats let on long leases. You collect ground rent (if any), arrange building insurance, and deal with any landlord obligations under the leases (typically maintenance of the structure and shared parts, recovering costs through service charges). This is straightforward but does mean ongoing administrative responsibility, and you remain on the title indefinitely.
2. Transfer the freehold to a management company owned by the leaseholders
A jointly owned management company (often called a "share of freehold" arrangement) becomes the freeholder. Each flat owner has an equal share. The leaseholders collectively manage the building, arrange insurance, and decide on maintenance. This is widely seen as the cleanest long-term outcome for leaseholders, and is increasingly common in newly created leases. It does require setting up a limited company at the splitting stage and transferring the freehold into it.
3. Sell the freehold separately
You can sell the freehold as a separate transaction, either as part of the original sale to one of the flat buyers, or to a separate freehold investor. Freehold investors do exist; they typically pay a multiple of the annual ground rent (if any) plus a value for the long-term reversion. For low-ground-rent leases, the freehold has limited investment value, but a leaseholder buyer often wants it.
Many sellers find the management-company route is the cleanest. It removes any future landlord liability, often increases the marketability of the leasehold flats (buyers value share-of-freehold), and creates a clean exit. Discuss with your solicitor at the splitting stage; the company can be set up at the same time as the leases are created, and the leases can be drafted to reflect the management-company structure.
Documents You Will Need
Whichever route you choose, the buyer's solicitor will request a defined set of documents. Gathering these early avoids the delays that often derail title-splitting sales. Some take weeks to obtain.
Title deeds and Land Registry register: the existing freehold title document. Your solicitor obtains this from HM Land Registry.
Energy Performance Certificates (EPC): one for each flat. Must be in date (less than 10 years old). Commission separate EPCs for each unit if not already done.
Planning permission documents: for the original conversion, if obtained. If not, a Certificate of Lawfulness or evidence supporting one. The local authority's planning portal often has historical documents online.
Building regulations approvals or completion certificates: for the original conversion work. If missing, a building control regularisation certificate may be obtainable.
Fire Risk Assessment (FRA): required for the common parts under the Fire Safety Order. Buyers and lenders will ask for it.
Gas safety certificates: for any gas appliances in either flat, current within the last 12 months.
Electrical Installation Condition Report (EICR): ideally for each flat, and for any shared circuits.
Draft leases (if splitting): the draft lease for each flat, prepared by your solicitor.
Management arrangements: details of any management company, service charge accounts (if existing), and insurance arrangements.
Tenancy agreements: if either flat is currently let, the tenancy agreement, deposit protection certificate, and rent payment history.
For an as-one sale to a cash investor, the document requirements are lighter (the investor will deal with most of the leasehold-creation paperwork themselves). For a splitting-and-sell-separately route, the full set above will be required by each flat-buyer's solicitor.
Sell Flat UK Buys Two-Flat Properties Direct
If a direct sale of the whole property is the right route for your circumstances, we buy unsplit two-flat properties for cash, including those with planning, building-regulations, or fire-safety issues. We assess the position together, factor any required compliance work into our offer from the start, and complete typically within 3 to 6 weeks.
The trade-off is a price below open-market value in exchange for speed and certainty. It is one of several valid routes alongside auction, sale to a developer, and the longer route of splitting the title and selling each flat separately on the open market. We will tell you honestly if a different route is likely to produce a better net result for your situation.
Yes, if you want to sell each flat to a separate buyer. You cannot sell an individual flat to a mortgage-backed buyer without that flat having its own leasehold title. Splitting the freehold into leasehold titles requires a solicitor to draft and register the leases at HM Land Registry, and may require compliance with any planning or building regulations conditions from when the conversion was done.
No. Mortgage lenders require a flat to have its own registered leasehold title before they will lend. A flat that is part of a single freehold title cannot be mortgaged as a separate unit. This means selling without splitting the title is effectively limited to cash buyers who can accept the unusual title structure.
Usually more if sold separately after splitting the title, because each flat can then be sold to a mortgage buyer at full market value. The legal and compliance costs of splitting the title need to be deducted from the uplift. Solicitor fees alone typically run to £2,000 to £5,000, plus surveyor and Land Registry fees. The net gain depends on the local market values and the condition of both flats.
An unlawful conversion can make both flats difficult or impossible to sell with mortgages until the planning position is regularised. Options include applying for retrospective planning permission, applying for a Certificate of Lawfulness if the conversion has been continuous for at least four years, obtaining indemnity insurance, or selling as-is to a cash buyer who is willing to take on the risk. A solicitor can advise on the specific position for your property.
Broadly: solicitor fees of £2,000 to £5,000 or more depending on complexity; surveyor fees of £500 to £1,500; Land Registry fees based on the property value (typically a few hundred pounds for two leases); and potentially planning or building regulation compliance costs if these have not previously been obtained. The total can vary significantly depending on whether the conversion was done properly in the first place.
Typically two to six months for the splitting process, then a further two to three months for each flat sale to complete on the open market. Faster routes are possible if the conversion is straightforward and all planning and building regulations are in order. Slower if planning regularisation, retrospective certificates, or fire-safety remediation are needed first.
Yes. Experienced cash investors and developers will buy a single-title property knowing they will create the leases themselves after purchase. They take on the legal work, the planning compliance, and the registration, and they discount their offer accordingly to reflect that effort and risk. The trade-off is a faster, simpler sale at a lower headline price than splitting the title and selling each flat separately.
Title deeds, EPCs for each flat, planning permission and building regulations approvals (or evidence of the position if not obtained), gas and electrical safety certificates, fire safety documentation including any FRA, draft leases (if you are splitting), and any management or service-charge arrangements you have set up. The buyer's solicitor will request all of these. Gathering them early avoids delays.
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