Conveyancing in London takes longer than most buyers expect. The average residential conveyancing transaction in London runs 12 to 16 weeks from offer acceptance to completion, and this extends to 20 weeks or more for properties in long chains, for leasehold flats where managing agents are slow to respond, or where any party in the transaction has mortgage complications or is slow to act.
The national average is closer to 10 to 12 weeks. London exceeds this because of three structural characteristics of the London market: a higher proportion of leasehold properties requiring additional work, longer and more complex chains, and local authority search return times in some London boroughs that routinely run to 6 or 8 weeks.
Understanding what drives the timeline — stage by stage — and knowing what accelerates or delays each stage is the most useful knowledge any London buyer or seller can have before a transaction begins.
Why London Conveyancing Takes Longer Than the National Average
Before working through the stages, it is worth naming the three London-specific factors that consistently extend the timeline.
Leasehold prevalence. Approximately two thirds of all dwellings in London are flats, and the overwhelming majority are leasehold. Leasehold conveyancing requires a management information pack from the freeholder or managing agent — covering service charge accounts, buildings insurance, ground rent schedule, and any anticipated major works. London managing agents vary significantly in their response times, from five working days to eight weeks. This one step can add 4 to 8 weeks to an otherwise straightforward transaction.
Chain complexity. London property transactions are more commonly part of chains — sequences of dependent sales where each buyer is also a seller. A chain of five parties means five sets of searches, five mortgage applications, five survey processes, and five solicitors — any one of which can hold up everyone else. London chains are longer on average than those in other UK regions because the volume and value of transactions creates more complex dependency structures.
Local authority search timescales. In London, local authority search return times vary dramatically between boroughs. Some boroughs return searches in 5 to 10 working days. Others are running backlogs of 6 to 8 weeks at peak periods. This is entirely outside the buyer’s control and is one of the most common causes of the 16-week transaction that was expected to take 12.
The Key Stages and Their Realistic Timescales
Stage 1 — Solicitor Instruction and Initial Paperwork: 1 to 2 Weeks
Both buyer and seller instruct solicitors following offer acceptance. The seller’s solicitor prepares the contract pack — title documents, the Property Information Form (TA6), the Fittings and Contents Form (TA10), and for leasehold, the Leasehold Information Form (TA7). The buyer’s solicitor receives this pack and begins review.
Simultaneously, the buyer completes anti-money laundering (AML) verification — identity documents and source of funds evidence. For international buyers, this process frequently takes longer than for domestic buyers, particularly where funds are held in foreign currencies or held through corporate structures. Assembling AML documentation before offer acceptance is the single most effective accelerator available to any buyer.
Stage 2 — Property Searches: 3 to 8 Weeks
The buyer’s solicitor submits the required searches to the relevant authorities. In London, the core searches are:
- Local authority search — the most variable and most consequential search for timeline purposes. Returns range from 5 working days in fast-processing boroughs to 6 to 8 weeks in boroughs with significant backlogs. Personal searches (conducted by a commercial search agent rather than the local authority directly) are faster — typically 3 to 5 working days — and are accepted by most mortgage lenders. Ask your solicitor whether personal searches are available and accepted for your transaction.
- Water and drainage search — typically 3 to 5 working days
- Environmental search — typically 3 to 5 working days
- Land Registry search — confirms ownership; typically 3 to 7 working days
- Chancel repair search — 2 to 3 working days
The local authority search is the stage most buyers do not anticipate as a long bottleneck. Ask your solicitor at instruction which borough the property falls within and what the current search turnaround estimate is for that borough.
Stage 3 — Survey and Mortgage Offer: 2 to 6 Weeks
If the purchase is mortgage-dependent, the lender’s valuation must be completed and the formal mortgage offer issued before exchange can proceed. Most lenders complete this in 2 to 4 weeks from a complete application. Complex or high-value properties — unusual construction, short leaseholds, non-standard valuations — can extend this.
A RICS Building Survey (if separately commissioned) typically takes 1 to 2 weeks from instruction. For any London leasehold flat, a Level 2 or Level 3 survey is worth commissioning regardless of whether the lender requires one.
Stage 4 — Enquiries: 2 to 6 Weeks
The buyer’s solicitor raises enquiries with the seller’s solicitor — specific questions arising from the title documents, search results, and Property Information Forms. The seller’s solicitor responds, and further rounds of enquiries may follow for complex properties.
This stage is the most variable in the transaction. A motivated, well-organised seller whose property has clean title and straightforward documents can move through enquiries in 10 to 14 days. A seller with slow responses, or a property with complex planning history, unusual title arrangements, or shared access disputes, can extend this stage significantly.
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Stage 5 — Leasehold-Specific Work: 2 to 8 Additional Weeks
For leasehold properties — the majority of London flats — the following additional steps run in parallel with or following the main enquiry stage:
- Obtaining and reviewing the management information pack from the managing agent
- Reviewing the full lease, which can be 200 to 300 pages for older leases
- Investigating ground rent history and any onerous clauses
- Checking service charge accounts for any disputes or large upcoming expenditure
- Confirming the remaining lease term and whether extension is required
- Satisfying the mortgage lender’s specific leasehold requirements (many lenders require a minimum 70 years unexpired lease at the end of the mortgage term)
Under the Leasehold and Freehold Reform Act 2024, leaseholders can extend to 990 years immediately on purchase — the previous two-year ownership requirement having been abolished in January 2025. This has removed one historic obstacle to leasehold purchase, but the conveyancing work involved in confirming the lease position remains.
Stage 6 — Exchange: The Legal Commitment Point
Exchange of contracts is the legally binding moment in the transaction. Both solicitors exchange signed contracts simultaneously by telephone, confirmed in writing. The deposit — typically 10% of the purchase price — transfers from buyer to seller’s solicitor at exchange. Withdrawal after exchange forfeits the deposit.
Exchange requires: all searches received and satisfactory, all enquiries answered, mortgage offer in hand, survey concerns resolved, and both parties having signed their contracts. The exchange date is set by agreement between both parties.
Stage 7 — Completion: 1 to 4 Weeks After Exchange
Completion is when legal title transfers and keys are released. Most London completions occur on a Friday, allowing the weekend for moving. The period between exchange and completion is typically one to four weeks, though simultaneous exchange and completion on the same day is possible for straightforward transactions.
For Law Society guidance on the conveyancing process, check: Law Society — buying and selling property
What Buyers Can Do to Speed Up the Process
Instruct a solicitor before your offer is accepted. The most avoidable delay in any London conveyancing transaction is the gap between offer acceptance and solicitor instruction. Having a solicitor already engaged, with AML verification started, means the process begins the day the offer is accepted.
Complete AML documentation immediately and completely. Provide every document requested — passport, proof of address, bank statements, source of funds — on the same day you receive the request. Incomplete submissions require follow-up, which costs days.
Use a solicitor with London leasehold experience. For any London flat purchase, leasehold experience is the most important qualification. Solicitors unfamiliar with managing agent processes, long London lease structures, and the Leasehold and Freehold Reform Act 2024 create avoidable delays and risks.
Chase managing agents actively on leasehold management packs. Ask your solicitor to apply for the management pack as early as possible and to chase if no response within two weeks. This step is often deprioritised until other elements are resolved — but a slow managing agent can hold up completion by weeks even when everything else is ready.
Respond to your solicitor on the same day. Solicitors cannot progress a transaction faster than their clients allow. Same-day responses to every query maintain momentum. Batching responses — replying once a week — costs weeks.
For Land Registry property and title search guidance, check: HM Land Registry
Conclusion
London conveyancing takes 12 to 16 weeks on average and longer for leasehold flats, complex chains, and boroughs with slow local authority search returns. The stages most commonly causing delay are local authority searches (3 to 8 weeks), managing agent packs for leasehold properties (2 to 8 weeks), and the enquiries stage (2 to 6 weeks). The most effective buyer actions are instructing a solicitor before offer acceptance, completing AML documentation immediately, using a leasehold-experienced solicitor, and responding to every solicitor request on the same day it is received.
Frequently Asked Questions
How long does conveyancing take in London on average?
London residential conveyancing typically takes 12 to 16 weeks from offer acceptance to completion. Leasehold transactions — the majority of London flat purchases — typically add 2 to 8 weeks for managing agent packs and lease-specific work. Complex chains can push the timeline beyond 20 weeks.
What causes conveyancing delays in London?
The most common causes are local authority search returns (ranging from 5 days to 8 weeks between boroughs), slow managing agent responses on leasehold management packs, mortgage valuation and offer delays for complex properties, protracted enquiries where the seller or their solicitor responds slowly, and chain complications where any other party’s delay affects everyone.
Can London conveyancing complete in less than 12 weeks?
Yes — chain-free transactions on freehold properties with straightforward title can exchange and complete in 6 to 8 weeks. The combination of a proactive solicitor, immediate AML documentation, and no chain is the fastest realistic scenario. Most leasehold transactions require at least 10 to 12 weeks even when everything goes smoothly.
Why does leasehold conveyancing take longer in London?
Leasehold conveyancing requires a management information pack from the freeholder or managing agent, full review of the lease document, investigation of service charge history, lease length confirmation, and satisfaction of lender-specific leasehold requirements — all of which involve third parties outside the buyer and seller’s control. Managing agents in London vary from a 5-day response to an 8-week one.
