Planning a 2027 Build: Why Autumn Is the Time to Start Design, Quotes and Approvals
If you want your extension, loft conversion, refurbishment or small development to start in 2027, the best time to begin is now. Building is only the final stage of a longer process, and most of the delay we see on projects comes from the part before anyone picks up a tool. This guide explains why autumn is the right moment to start, and what a realistic lead-in looks like.
The build is the end of the process
Before work starts on site you typically need to complete several stages, and each one takes time:
Initial ideas and a feasibility discussion.
Measured survey and concept design.
Planning permission or a lawful development certificate, if required.
Technical drawings and structural design.
Building Regulations approval.
Party wall notices and agreements, where relevant.
Pricing, contract and programme.
Ordering lead items and mobilising on site.
Run back from your preferred start date and the starting line usually moves earlier than you would think.
Why autumn works
Starting design now gives you a sensible run-up for a spring or summer start. In practice:
Design work done over the autumn and winter lets you use quieter months for approvals.
Councils and building control teams have their own timescales, which you cannot compress, so early submission matters. Householder planning applications are generally meant to be decided within a set period, but pre-application discussions, validation queries and any amendments add time. Check your council's current guidance.
Party wall notices carry statutory notice periods, and disputes can extend them.
Good builders and specialist trades often have forward order books, so booking a slot early protects your dates.
Work such as groundworks, roofing and external works is generally easier in better weather.
Quotes: how to get comparable ones
Quotes are only as good as the information behind them. To compare like with like, you need:
Drawings and a specification, not a verbal brief.
Clear allowances for items you will choose later, such as kitchens, tiles and sanitaryware.
A defined scope covering party walls, skips, scaffolding, making good and decoration.
A programme and payment schedule.
The cheapest quote on a loose brief often becomes the most expensive project. Our cost calculator can give a first impression of budget, and we can refine it once we have drawings.
Approvals you may need
Depending on the project, you may need some or all of the following:
Planning permission, or confirmation that permitted development applies.
Listed building consent or conservation area consent, where relevant.
Building Regulations approval.
Party wall awards or agreements.
Landlord or freeholder consent, for flats.
Highways or scaffold licences for street works.
Check with your local council, because rules and processes differ between boroughs and between types of property.
If you are a landlord or small developer, the same logic applies with extra weight, because holding costs and finance interest run while approvals are pending. Starting design in autumn lets you submit applications in good time and understand your real programme before committing to a purchase or a letting date.
Lead items and supply chain
Windows, bespoke glazing, steelwork, kitchens and some specialist materials can have lead times that run into weeks or months. Specifying them early, and confirming a delivery date before the build starts, avoids a stalled site.
Money and decisions
Autumn is also a good time to settle finance, whether you are remortgaging, using savings or arranging a development loan. Lenders may want drawings, a fixed-price contract and evidence of approvals, and each of those takes time to produce.
How TNK can help
TNK Construction has more than 17 years of experience and 150+ projects across loft conversions, extensions, refurbishments, new builds and fit-outs. We offer design and build, so one team can take you from the first idea through approvals to completion, with CITB-accredited builders and joiners on site.
Finally, treat the first meeting as the start of a conversation, not a commitment. Ask questions, bring photos and any previous planning paperwork, and be open about your budget and timing. We would rather tell you honestly what is achievable and by when, so you can plan your year with confidence, than promise a date we cannot keep.
Frequently asked questions
When should I start if I want to build in summer 2027?
As early as you can. Working back from your start date, autumn leaves room for design, approvals and pricing without rushing.
Can I get a quote before I have planning permission?
Yes, an indicative budget is useful early on, and a firm price follows when drawings and approvals are in place.
Is it cheaper to build in winter?
Not necessarily. Weather can slow external work, so plan your programme sensibly.
Start the conversation
If you want to start a project in 2027, now is the time to talk. Contact TNK Construction to arrange a consultation, explore the cost calculator, and see our extensions and loft conversion services for ideas on what to build.
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