At KT5 Construction, your trusted local builder covering Surrey and London, one of the most common questions we hear is: “When is the Best Time to build an Extension Project?” Whether you’re planning a rear extension, loft conversion, or full renovation, the timing of your project can make all the difference. Weather, planning approvals, contractor availability, and even personal milestones all play a role. In this expert guide, we’ll walk you through the pros and cons of each season and share KT5’s practical insights to help you get started with confidence.
Why Timing Matters for Home Extensions
A home extension is a significant investment of both time and budget. Starting at the right time can:
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Minimise weather-related delays
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Improve access to in-demand tradespeople
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Help you secure better deals on materials and labour
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Ensure smoother project planning and approvals
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From our experience in delivering successful projects across London and Surrey, the timing of your project is one of the most crucial decisions you’ll make.
Seasonal Breakdown: When Should You Build?
Spring: A Head Start on the Season
Spring, especially March and April, is ideal if you’re looking for milder weather and lower rainfall. The ground is softer for foundation works, and cold snaps are less likely to affect concrete or brickwork.
KT5 Insight: Starting in spring allows us to hit peak construction phases during summer—keeping your project on schedule.
Summer: The Construction Sweet Spot
Summer (June to August) offers longer daylight hours and drier conditions—perfect for uninterrupted building work. It’s the most popular season to build, meaning trades may be in high demand.
Tip from KT5: Book your summer slot months in advance. Our diary fills fast, especially for rear extensions and loft conversions.
Autumn: Balance & Opportunity
Autumn is often overlooked, but September and October can still offer decent weather with lower contractor demand. It’s a strategic time to start without the scheduling chaos of summer.
Winter: Quiet but Cost-Effective
Winter is quieter for construction. While weather is less predictable, you may benefit from better pricing and faster contractor availability. With proper tarpaulin protection and planning, projects can still run smoothly.
KT5 Solution: We often advise clients to plan in winter and build in spring. This approach ensures permits and design work are ready when the ground thaws.
Why Homeowners Choose KT5 Construction
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- Seasoned professionals: We understand how to navigate planning delays and seasonal risks.
- Local expertise: Trusted builders in London and Surrey with a proven track record.
- Flexible scheduling: We work around your timeline, budget, and lifestyle.
- Transparent pricing: No hidden fees, no last-minute surprises.
- Smart value engineering: We’ll review your architect’s plans and identify areas to save without compromising quality.
Pre-Planning: The Hidden Key to a Smooth Project
1. Factor in Design and Permissions
Design plans, party wall notices, and planning permission can take 3–5 months to finalise. Start this process early—ideally before your preferred build season begins.
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Use private building control inspectors to speed up approval.
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Budget 2 extra months if a party wall agreement is required.
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2. Secure Your Builder Early
The best builders are booked in advance—often 6 to 12 months ahead. Delaying contact could cost you your preferred contractor and lead to rushed decisions later.
3. Align with Life Events
Think ahead—if you’re expecting a baby or planning a big family event, consider how construction noise or temporary dislocation might impact your home life.
KT5 Tip: Many of our clients reach out once they know they need space, even if they don’t plan to start for a year. This early conversation helps lock in budgets and feasibility.
Common Questions Answered – Best Time to Build an Extension
1. How long does a typical home extension take?
On average, 9 months from design to completion. This includes:
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Surveys and planning: 2–4 months
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Party wall and structural approvals: 1–2 months
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Construction: 4–6 months.
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2. Can I start planning now and build later?
Yes—your planning permission remains valid for 3 years. Many clients choose to finalise designs and secure approvals early to gain flexibility.
3. Does KT5 offer planning support?
Absolutely. Our team offers end-to-end service—from concept drawings and structural calculations to permitted development guidance.
Final Thoughts: Plan Early, Build Smart
The best time to start your home extension project isn’t just about the weather—it’s about preparation. Whether you want to build this summer or next spring, the time to begin planning is now. From the moment you decide you need more space, KT5 Construction is ready to guide you every step of the way.
Email Us Your Requirements Today
Let’s help you plan a seamless, budget-friendly extension.
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