How to Plan a Kitchen Extension in the UK: A Lincoln Homeowner's Guide
The kitchen is where family life happens. So when it feels cramped, dark or dated, an extension can transform how your whole home works.
But a successful kitchen extension starts long before the first brick is laid. Get the planning right and the build runs smoothly. Get it wrong and you face delays, surprise costs and stress.
As house extension builders in Lincolnshire, we've guided many local families through this process. Here's our practical, step-by-step guide to planning yours.
Step 1: Work out what you want from your new kitchen
Before you think about bricks or budgets, think about how you live. The best extensions solve real, everyday problems.
Ask yourself:
Do you want an open-plan kitchen, dining and living space?
Do you need room for an island, a utility area or a downstairs WC?
Is natural light a priority? Think rooflights, bi-fold or sliding doors.
How will the new space connect to your garden?
Are you planning to stay long-term, or adding value to sell?
Our tip: Spend a week noting what frustrates you about your current kitchen. Those notes become a brilliant brief for your designer and builder.
Choose the right type of extension
The shape of your home and garden will guide which option works best:
Single-storey rear extension: the most popular choice, ideal for open-plan living.
Side return extension: great for terraced and semi-detached homes with an unused side passage.
Wraparound extension: combines rear and side for maximum space.
Orangery or part-glazed extension: brings in loads of light while feeling solid and warm.
Step 2: Set a Realistic Budget
The cost of extension work is the question we're asked most. The honest answer is that it depends on size, design, ground conditions and finish.
What affects the cost of an extension?
Size and shape: a simple rectangle costs less per square metre than a complex design.
Glazing: large bi-folds, sliding doors and roof lanterns add significant cost.
Foundations and ground conditions: clay soils, trees and drains nearby can mean deeper foundations.
Knocking through: removing load-bearing walls needs steel beams and structural calculations.
Kitchen fit-out: units, worktops and appliances are often budgeted separately.
Moving services: relocating a boiler, gas pipes, plumbing or drainage.
As a rough guide, single-storey extensions in Lincolnshire often cost around £1,800 to £2,800 per square metre for the build itself (approximate, 2026). Your kitchen fit-out comes on top.
Budgeting tips from our team
Add a contingency of 10–15% for the unexpected. Older Lincolnshire homes in particular can hide surprises.
Remember the extras: architect fees, structural engineer, planning and building control fees.
Check whether quotes include VAT.
Get a fixed, itemised quote so you can compare like for like.
Step 3: Check Whether You Need Planning Permission
Many single-storey kitchen extensions don't need full planning permission. They can be built under permitted development rights, as long as they meet certain rules.
Permitted development: the key rules
For a single-storey rear extension in England, generally:
It can extend up to 3 metres from the original rear wall (semi-detached or terraced) or 4 metres (detached).
Larger extensions, up to 6 or 8 metres, may be possible through the council's prior approval process.
It must be no higher than 4 metres.
If it's within 2 metres of a boundary, the eaves can be no higher than 3 metres.
It can't cover more than half the land around the original house.
Materials should be similar in appearance to the existing house.
When you will need planning permission
Your home is a listed building or in a conservation area (Lincoln has several, including around the Cathedral Quarter).
Your property is a flat or maisonette.
Your permitted development rights have been removed.
Your design goes beyond the limits above.
Our tip: Even if you think you don't need planning permission, consider applying for a Lawful Development Certificate from your council. It gives you written proof, which is reassuring and helpful when you come to sell.
Depending on where you live, you'll deal with City of Lincoln Council, North Kesteven, West Lindsey or another Lincolnshire district council. A householder planning decision usually takes around 8 weeks.
Step 4: Don't Forget Building Regulations
This catches many first-time renovators out. Even if you don't need planning permission, you will almost always need Building Regulations approval.
Building Regulations cover how your extension is built, including:
Foundations and structural safety
Insulation and energy efficiency
Fire safety and escape routes
Drainage and ventilation
Electrical and gas safety
Your builder or designer can submit the application to council building control or a registered building control approver. Inspections happen at key stages of the build.
Other permissions to check
Party Wall Agreement: needed if you're building on or near a shared boundary wall. You must notify neighbours in advance.
Build-over agreement: if a public sewer runs under your extension, you'll need consent from Anglian Water.
Step 5: Plan Your Heating, Plumbing and Electrics Early
A new kitchen extension often means rethinking your services. Leaving this until late in the build is a common and costly mistake.
Think about:
Heating: will your existing boiler cope with extra radiators or underfloor heating?
Boiler location: many kitchen extensions involve moving or upgrading the boiler.
Sockets and lighting: plan where your island, appliances and lights go before plastering.
Ventilation: a good extractor is a must in open-plan spaces.
Our tip: Because our group includes Precision Boilers, we plan heating into your extension from day one, rather than treating it as an afterthought.
Step 6: Choose the Right Local Builders
Your builder makes or breaks your project. Choosing experienced local builders brings real advantages. They know Lincolnshire's soil types, local planning officers and building styles.
What to look for in house extension builders
A portfolio of completed extensions you can see or visit
Genuine reviews and references from local customers
Proper insurance, including public liability
A clear, written, itemised quote
A realistic timeline and payment schedule
Good communication: you should feel comfortable asking questions
One point of contact who manages all the trades
Questions to ask before you sign:
Who will be on site day to day?
Do you handle building control and party wall notices?
What's not included in the price?
What guarantees do you offer on workmanship?
Step 7: Understand the Build Timeline
Knowing what happens when helps you plan around family life. A typical kitchen extension follows these stages:
Design and drawings: 4–8 weeks
Planning or Lawful Development Certificate: around 8 weeks, if needed
Building Regulations approval and structural calculations: often alongside planning
Groundworks and foundations: 1–3 weeks
Walls, roof and windows (weathertight shell): 3–6 weeks
First fix: electrics, plumbing and heating
Plastering, knock-through and second fix: 2–4 weeks
Kitchen fit and decoration: 2–4 weeks
On site, most single-storey kitchen extensions take around 10–16 weeks, depending on size and complexity.
Our tip: You can usually stay in your home for most of the build. The new space is built first, and the wall is only knocked through near the end. Plan a temporary kitchen for that final stretch.
Ready to Plan Your Kitchen Extension in Lincolnshire?
A well-planned kitchen extension can give your family the space you've been dreaming of, and add real value to your home.
At Precision Construction, we're trusted house extension builders in Lincoln and across Lincolnshire. We manage your project from first sketch to final finish, coordinating every trade so you have one team to deal with.
Whether you're just exploring ideas or ready to start, we're happy to help. We'll talk you through costs, planning permission and what's possible for your home, with no pressure and no jargon.
Get in touch today for your free, no-obligation quote or consultation.
01526 378356 | enquiries@theprecisiongroup.co.uk
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