Timeline Overview: The Three Scenarios
The total time from first visit to moving in varies dramatically depending on the type of purchase.
| Scenario | Total Timeline | Key Variable |
|---|---|---|
| Completed property (ready to move in) | 6-12 weeks | How quickly your mortgage and legal work complete |
| Under construction (part-built when you reserve) | 3-9 months | Construction progress and completion date accuracy |
| Off-plan (not yet started or early-stage build) | 9-30+ months | Construction timeline — can extend significantly with delays |
Why New Build Timelines Differ from Resale
On a standard resale purchase, the timeline is driven by the chain — how many buyers and sellers need to synchronise. On a new build, there's no chain (you're buying from the developer), but the timeline is driven by construction progress and the developer's internal deadlines. The legal and financial work runs in parallel with the build, not sequentially.
Pre-Reservation: Research and Preparation (2-12 Weeks)
The time you invest before reserving directly affects how smoothly everything runs afterwards.
| Task | Typical Duration | Can You Start Before Visiting? |
|---|---|---|
| Online research — developments, areas, prices | 1-4 weeks | Yes — this is your starting point |
| Decision in Principle (DIP) from lender/broker | 24-48 hours once applied | Yes — and you should. Essential before reserving |
| Deposit confirmation — savings accessible, gifted deposit letter arranged | 1-2 weeks | Yes — verify funds are ready and have a clear paper trail |
| Solicitor research and appointment | 3-7 days | Yes — get quotes and shortlist before you visit the sales centre |
| Visiting developments and show homes | 2-6 weeks (multiple visits) | N/A |
| Area research — transport, schools, amenities, flooding | 1-2 weeks | Yes — use the Environment Agency flood map, Ofsted, and local council planning portal |
How to Use This Time Well
The buyers who have the smoothest purchases are the ones who arrive at the sales centre with a DIP, a solicitor on standby, and accessible funds. This means when you decide to reserve, you can move immediately — and the 28-day clock to exchange starts with everything already in motion.
For what to ask during visits, see our 100+ questions to ask guide.
Reservation to Exchange (4-8 Weeks)
This is the most time-critical phase. The developer typically expects exchange within 28 days of reservation (though extensions to 42 or 56 days are sometimes possible).
What Happens and How Long Each Part Takes
| Task | Who Does It | Typical Duration | Runs in Parallel With |
|---|---|---|---|
| Reservation agreement signed, fee paid | You + developer | Day 1 | — |
| Instruct solicitor | You | Day 1-2 | — |
| Developer's solicitor sends contract pack to your solicitor | Developer's solicitor | 3-10 days after reservation | Mortgage application |
| Full mortgage application submitted | You + broker | Days 1-5 | Legal work |
| Mortgage valuation arranged and completed | Lender | 5-15 days from application | Legal work |
| Mortgage offer issued | Lender | 2-4 weeks from application | Legal work |
| Solicitor reviews contract pack and raises enquiries | Your solicitor | 5-14 days from receipt of pack | Mortgage application |
| Developer's solicitor responds to enquiries | Developer's solicitor | 5-14 days | Mortgage valuation |
| Solicitor reviews search results | Your solicitor | Searches take 5-20 days depending on local authority | Contract review |
| Solicitor reports to you and you sign contract | Your solicitor + you | 2-5 days | — |
| Exchange of contracts | Both solicitors | 1 day | — |
The Critical Path
The three potential bottlenecks that determine your exchange timeline are:
- Mortgage offer — typically 2-4 weeks from application. This can't happen until your full application is submitted with all documents
- Legal searches — typically 5-20 days depending on the local authority. Some councils take 4-6 weeks during busy periods
- Contract pack and enquiries — depends on the developer's solicitor's responsiveness and the complexity of the legal pack
If all three run in parallel and there are no complications, exchange can happen in 4 weeks. If any bottleneck causes delay, expect 6-8 weeks.
For details on what happens during these 28 days, see our critical 28 days after reservation guide.
Exchange to Completion
The gap between exchange and completion depends entirely on the state of the property.
Timeline by Property Status
| Property Status at Exchange | Typical Gap to Completion | Risk of Delay |
|---|---|---|
| Completed and ready to occupy | 1-4 weeks (often simultaneous exchange and completion) | Low — property exists, only legal formalities remain |
| Nearly complete (internal finishes stage) | 4-12 weeks | Medium — weather, supply chain issues, or labour shortages can extend |
| Under construction (superstructure complete) | 3-6 months | Medium-High — multiple stages still to complete |
| Early construction (foundations/substructure) | 6-12 months | High — many variables can cause delay |
| Pre-construction (off-plan, not yet started) | 12-30+ months | Very high — planning conditions, site preparation, full build programme |
What Happens During This Period
Between exchange and completion, you're waiting for the developer to finish the build. During this time:
- Monitor your mortgage offer expiry — standard offers last 6 months from issue date. If completion won't happen before expiry, contact your broker at least 6 weeks before to arrange an extension or new application
- Track construction progress — request updates from the developer. Some allow site visits at key stages
- Arrange insurance — buildings insurance should start from the completion date
- Plan your move — book removals, redirect post, arrange utility connections
- Save for furnishing — new builds come empty. No curtain poles, no shelving, no garden landscaping
The Notice Period
Once the developer confirms the property is ready, they typically give 10-14 days' written notice of the completion date. Your solicitor uses this time to:
- Request the mortgage funds from your lender (usually 5 working days)
- Prepare the completion statement
- Confirm all legal requirements are met
- Arrange the transfer of funds
Completion to Settled (1-6 Months)
Getting the keys is just the start. Settling into a new build takes time.
| Task | When | Duration |
|---|---|---|
| Home demonstration by developer | Completion day | 30-60 minutes |
| Meter readings and utility registration | Completion day | 30 minutes |
| Snagging inspection | First 1-7 days (ideally before moving furniture in) | 2-4 hours |
| Report snagging list to developer | Within first 2 weeks | 1-2 hours to compile and submit |
| Snagging fixes by developer | 2-8 weeks (some items take longer) | Multiple visits typically needed |
| Land Registry confirmation | 4-12 weeks after completion | Handled by your solicitor |
| Stamp duty payment | Within 14 days of completion | Handled by your solicitor |
| Building drying out period | First 9-12 months | Ongoing — affects decoration, doors, cracks |
| Garden establishment | First 6-12 months | Turf takes 6+ months to establish properly |
| Infrastructure completion (if early phase) | 6-24+ months | Roads adopted, play areas finished, landscaping completed |
For detailed completion day advice, see our hour-by-hour completion guide. For snagging, see our 200+ item snagging checklist.
Managing Parallel Workstreams
The fastest new build purchases happen when multiple tasks run simultaneously rather than sequentially.
What Can Run in Parallel
| Workstream A | Workstream B (Running Simultaneously) | Time Saved vs Sequential |
|---|---|---|
| Mortgage application and valuation | Solicitor reviewing contract pack and ordering searches | 2-3 weeks |
| Waiting for search results | Solicitor raising and resolving enquiries with developer's solicitor | 1-2 weeks |
| Mortgage underwriting | Solicitor finalising contract review | 1-2 weeks |
| Waiting for construction (post-exchange) | Arranging insurance, planning move, furnishing research | N/A (but reduces post-completion stress) |
What Must Happen Sequentially
- Reservation → then instruct solicitor and submit mortgage application
- Mortgage valuation → then mortgage offer (the offer can't be issued until the valuation is satisfactory)
- All legal work complete + mortgage offer received → then exchange can happen
- Exchange → then completion (you can't complete without having exchanged)
- Completion → then Land Registry registration and stamp duty payment
The Ideal Timeline
If everything runs perfectly in parallel:
- Week 1: Reserve. Instruct solicitor. Submit full mortgage application with all documents.
- Week 1-2: Developer's solicitor sends contract pack. Your solicitor starts review. Mortgage valuation booked.
- Week 2-3: Valuation completed. Searches ordered. Solicitor raises enquiries.
- Week 3-4: Mortgage offer issued. Enquiry responses received. Search results back.
- Week 4: Solicitor reports to you. You sign contract. Exchange.
This perfect scenario is achievable but requires preparation, responsive professionals, and no complications.
What Causes Delays at Every Stage
Pre-Exchange Delays
| Delay | Typical Impact | How Common | Prevention |
|---|---|---|---|
| Slow mortgage application (missing documents) | 1-3 weeks | Very common | Prepare all documents before reserving: payslips, bank statements, ID, address proof, SA302 if self-employed |
| Down-valuation | 2-6 weeks | Common (15-25% of new builds) | Discuss contingencies with broker before applying. See mortgage problems guide |
| Slow local authority searches | 1-4 weeks beyond normal | Varies by area | Ask solicitor to order searches on day 1. Consider personal searches if available |
| Developer's solicitor slow to respond to enquiries | 1-3 weeks | Common | Your solicitor should chase proactively. Escalate through your sales adviser if needed |
| Contract pack not sent promptly | 1-2 weeks | Occasional | Confirm with sales adviser that the pack will be sent within 3 days of reservation |
| Gifted deposit issues (anti-money-laundering checks) | 1-3 weeks | Common when parents help | Get the gifted deposit letter and proof of funds ready before reserving |
| Credit issues discovered during full application | 2-6+ weeks | Occasional | Check your credit file with all three agencies before applying. Fix any errors |
Construction Delays (Post-Exchange, Off-Plan)
| Delay Cause | Typical Impact | How Common |
|---|---|---|
| Weather (heavy rain, extreme cold, high winds) | 2-8 weeks | Very common — UK weather is unpredictable |
| Material supply shortages | 2-12 weeks | Periodic — varies by material and global supply chains |
| Labour shortages (bricklayers, electricians, plumbers) | 2-8 weeks | Common — skilled trade shortages are ongoing |
| Planning condition discharge | 4-12 weeks | Occasional — some conditions take months to satisfy |
| Utility connections (gas, electric, water, broadband) | 4-16 weeks | Common — utility companies work to their own schedules |
| Building control issues | 2-8 weeks | Occasional — if inspections fail and remedial work is needed |
| Developer financial difficulties | Indefinite | Rare |
| Ground conditions (unexpected contamination, archaeological finds) | 4-26 weeks | Rare |
Post-Completion Delays
| Delay | Typical Impact | How Common |
|---|---|---|
| Snagging fixes taking months | 2-6 months for full resolution | Very common |
| Road and sewer adoption | 1-5+ years after development completes | Very common — council adoption is slow |
| Communal areas not finished (Phase 1 of multi-phase development) | 1-3+ years | Common |
| Land Registry registration | 4-12 weeks | Always — this is standard processing time |
How to Speed Up Every Stage
Before Reservation
| Action | Time Saved | Effort Required |
|---|---|---|
| Get a DIP before visiting any development | 1-2 weeks | Low — 30-minute online application |
| Shortlist 2-3 solicitors and get quotes | 3-7 days | Low — email or phone |
| Organise all mortgage documents in advance (payslips, bank statements, ID, P60, SA302) | 1-2 weeks | Medium — gathering paperwork |
| Check your credit file and fix any errors | Prevents 2-6 week delays | Low — free checks via Experian/Equifax/TransUnion |
| Arrange gifted deposit letter and donor's proof of funds | 1-3 weeks | Low-Medium |
| Research the development thoroughly before first visit | 1-2 weeks of deliberation | Low |
Reservation to Exchange
| Action | Time Saved | Effort Required |
|---|---|---|
| Instruct solicitor on the same day you reserve | 3-7 days | Already have one shortlisted |
| Submit full mortgage application within 48 hours of reserving | 1 week | Have documents ready |
| Ask solicitor to order searches immediately (don't wait for contract pack) | 1-2 weeks | One phone call |
| Respond to solicitor/broker requests within 24 hours | Cumulative 1-2 weeks | Keep your phone on and check emails daily |
| Chase developer's solicitor if contract pack isn't sent within 5 days | Prevents 1-2 week delay | One phone call to your sales adviser |
| Sign and return all documents promptly (don't sit on paperwork) | Cumulative 3-7 days | Low — just prioritise it |
Exchange to Completion
| Action | Time Saved | Effort Required |
|---|---|---|
| Monitor mortgage offer expiry and request extension 6 weeks before it lapses | Prevents 3-6 week delay (reapplication) | One call to broker |
| Arrange buildings insurance in advance (don't wait for completion notice) | Prevents last-minute scramble | 1 hour comparing quotes |
| Book removals as soon as you have an estimated completion date | Prevents 1-2 week delay getting a slot | One hour |
| Register with utility providers early | Prevents post-completion hassle | 30 minutes |
Critical Dates and Deadlines
Missing these deadlines can cost you money or cause your purchase to fall through.
| Deadline | What Happens If You Miss It | How to Avoid |
|---|---|---|
| Reservation period (28 days) | Developer can release the property. Reservation fee may be non-refundable | Move immediately: instruct solicitor, submit mortgage application, chase all parties |
| Mortgage offer validity (6 months) | Offer expires. You need to reapply — with fresh credit checks, income verification, and potentially different rates | Track expiry date. Request extension 6 weeks before. See mortgage problems guide |
| Search results validity (3-6 months) | Your solicitor may need to re-order searches at additional cost | Time searches to align with realistic completion timeline |
| Stamp duty payment (14 days after completion) | Interest and penalties from HMRC. Your solicitor handles this but you pay the bill | Ensure funds are with your solicitor before completion. Your solicitor should submit on your behalf |
| Longstop date | If the developer misses this, you can withdraw with deposit returned. But if YOU miss notice deadlines, you may lose this right | Know your longstop date. Mark it in your calendar. Discuss with solicitor well before it arrives |
| Notice to complete (10 working days) | If you can't complete within the notice period, the developer can rescind the contract and keep your deposit | Ensure funds and legal work are ready before the developer serves notice |
| Defects reporting (2 years from completion) | After the defects liability period, the developer is no longer obligated to fix non-structural issues | Report ALL defects during year 1-2. Keep written records |
Off-Plan Buying: Extended Timeline
Buying off-plan adds significant time and complexity to the process.
Typical Off-Plan Timeline
| Phase | Duration | What's Happening | What You're Doing |
|---|---|---|---|
| Pre-reservation research | 2-8 weeks | Development marketing begins. Show home or marketing suite open | Visiting, comparing, deciding |
| Reservation to exchange | 4-8 weeks | Developer begins or continues construction | Mortgage DIP → full application. Solicitor reviews contract. Searches ordered |
| Exchange to construction milestones | 6-24 months | Foundations → superstructure → first fix → second fix → finishes | Monitoring, extending mortgage if needed, planning furnishing |
| Developer notice of completion | 10-14 days | Property passes final inspections | Solicitor draws down mortgage. Final funds arranged |
| Completion | 1 day | Keys handed over | Moving in |
The Mortgage Challenge
The biggest timing challenge with off-plan purchases is the mortgage. Most offers last 6 months. If your property won't complete for 18 months, your strategy options are:
- Apply late — wait until the property is 4-5 months from completion, then apply. Risk: if completion is delayed further, you may still need an extension
- Apply early and extend — apply at reservation, get the offer, then request an extension nearer completion. Most lenders allow one extension of 3-6 months
- Specialist off-plan products — some lenders offer extended validity offers (9-12 months) specifically for off-plan purchases
Your broker should advise on the best strategy for your specific timeline. See our off-plan mortgage timelines guide.
The Developer's Timeline (What They Don't Tell You)
Understanding the developer's internal priorities helps you predict delays and negotiate better.
The Developer's Financial Calendar
| Period | Developer Behaviour | What It Means for You |
|---|---|---|
| Financial year end (June or December for most listed builders) | Developers push hard to complete homes before year-end to recognise revenue in that financial year | If your home is near completion at year-end, the developer will prioritise finishing it. But quality may be compromised by the rush |
| Financial half-year end | Similar revenue recognition pressure, but less intense | Same as above, to a lesser degree |
| Slow sales period (typically January-February) | Developers may offer enhanced incentives to maintain sales momentum | Better negotiating position. More choice of plots. Sales advisers more willing to be flexible on terms |
| Strong sales period (March-June, September-October) | Less incentive to negotiate. Higher demand | Fewer incentives. Less choice. More pressure to decide quickly |
| Phase launches | New plots released, often with introductory incentives | Best prices often available on launch day. But properties are furthest from completion |
Why Estimated Completion Dates Move
Developers provide estimated completion dates, but these are informed guesses, not promises. They move because:
- Developers under-promise build time to the Board but sales teams give optimistic dates to encourage reservations
- Build programmes are sequential — a delay in one plot ripples to others on the site
- External factors are unpredictable — weather, supply chain, utility connections, building control
- The contractual protection is the longstop date — the estimated completion date has no legal weight
As a rule of thumb, add 20-30% to any estimated completion timeline the developer gives you.
Week-by-Week Buying Calendar (Completed Property)
This is the fastest realistic timeline for buying a completed, ready-to-occupy new build home.
| Week | What's Happening | Your Action Items |
|---|---|---|
| Week 0 (before reserving) | Research, visits, DIP obtained, solicitor shortlisted | Visit developments. Compare plots. Get DIP. Choose solicitor |
| Week 1 | Reservation. Contract pack sent. Mortgage application submitted | Pay reservation fee. Instruct solicitor immediately. Submit full mortgage application with all documents |
| Week 2 | Solicitor starts reviewing contract. Valuation booked. Searches ordered | Respond promptly to any broker/solicitor requests. Chase contract pack if not yet received |
| Week 3 | Valuation completed. Solicitor raises enquiries. Searches processing | Provide any additional documents requested. Review solicitor's initial report |
| Week 4 | Mortgage offer issued. Enquiry responses received. Search results back | Review mortgage offer. Discuss any solicitor concerns |
| Week 5 | Solicitor's final report to you. Sign contracts | Read the report carefully. Sign and return contracts. Transfer exchange deposit to solicitor |
| Week 6 | Exchange of contracts | Completion date agreed (may be same day or within 2 weeks for completed property) |
| Week 6-8 | Completion | Solicitor transfers funds. Collect keys. Meter readings. Home demonstration. Snagging inspection |
Frequently Asked Questions
How long does it take to buy a new build from start to finish?
For a completed property: 6-12 weeks from reservation to keys. For off-plan: 6-30+ months depending on the build stage when you reserve. The most common scenario is 3-6 months for a property that's under construction when you reserve.
Can I speed up the process?
Yes. The biggest time savings come from preparation: having a DIP, pre-selected solicitor, organised documents, and accessible deposit before you reserve. During the process, respond to all requests within 24 hours and chase any party that goes quiet for more than a few days.
What happens if my mortgage offer expires before completion?
You'll need either an extension (most lenders allow one, for 3-6 months) or a fresh application. A fresh application means new credit checks, income verification, and potentially different interest rates. Contact your broker at least 6 weeks before expiry. See our mortgage problems guide.
How long do local authority searches take?
Typically 5-20 working days, but it varies enormously by council. Some inner London boroughs and busy rural councils can take 4-6 weeks. Your solicitor will know the typical turnaround for the relevant local authority. Personal searches (done by a search agent directly at the council offices) are sometimes faster but not all lenders accept them.
How accurate are developer completion dates?
Developer estimated completion dates are indicative, not binding. As a rule of thumb, add 20-30% to any estimate. The only legally meaningful date is the longstop date in the contract. If the developer gives you a "Q3 2026" estimate, plan for Q4 2026 to be safe.
Can the developer change the completion date after exchange?
The estimated completion date can move. The developer must complete by the longstop date (the maximum deadline set in the contract). If they miss the longstop date, you can withdraw and recover your deposit. See our contract guide.
How long does snagging take to resolve?
The inspection itself takes 2-4 hours. Submitting the report: 1-2 days. The developer's first round of fixes: 2-6 weeks. Full resolution of all items: 2-6 months (some complex items take longer). Keep records and chase regularly.
What is the fastest possible new build purchase?
The absolute fastest is a simultaneous exchange and completion on a completed property with a cash buyer (no mortgage) — potentially achievable in 2-3 weeks. With a mortgage on a completed property, 4-5 weeks is possible if everything runs perfectly. These are exceptional cases, not the norm.
Related Guides
- The Complete Guide to Buying a New Build
- The Complete Buying Process: Every Step
- The Critical 28 Days After Reservation
- Exchange of Contracts Guide
- Completion Day: Hour-by-Hour Guide
- Buying Off-Plan: Complete Guide
- Off-Plan Mortgage Timelines
- Common Mortgage Problems and Solutions
- 200+ Item Snagging Checklist
- 50 Expert Insider Tips