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House Extension Builders

Add More Space at Home
That Fits the Way You Live

Feel less boxed in and make life easier. House extensions in Lincolnshire can open up cramped rooms, improve flow and give daily life the space it has been missing.

Helping Homeowners Build House Extensions in Horncastle Woodhall Spa Legsby Louth Boston Grantham Sleaford Market Rasen Spalding Skegness Gainsborough

Why Extend with SB

Why Homeowners Choose SB for House Extensions

Layout-Led Plans

Plans shaped around light, movement and daily use.

Checks Up Front

Permissions and drawings settled before works begin.

Structural Planning

Steel, openings and foundations planned in early.

Managed Stages

Trades and timings managed to reduce disruption.

Extension Options

Choose the Extension Type That Fits You

The best house extension depends on where space is missing, how you live now and which layout change will make the biggest difference.

Add ground-floor space for cooking, dining and better family life.

Open up the back of the house for light and easy garden access.

Kitchen Diners

Create one sociable room for cooking, eating and gathering.

Gain space upstairs and downstairs while improving the  layout.

Make narrow side space useful and improve the way rooms connect.

Open-Plan Flow

Link old and new rooms so the whole layout works better.

Planning an Extension

What to Plan Before Extending Your Home

Extension work feels easier to manage when the big decisions are sorted early. These are the key areas that usually shape the build most.

House Extension Design

How Space Starts
Working for You

Good extension design should ease pressure on cramped rooms, so the new space improves flow and feels better suited to daily life.

lincolnshire single story extensions

Planning Permission for House Extensions

What Needs Checking
Before Work Starts

Planning permission or permitted development checks depend on size, height and how the extension sits against the existing property.

lincolnshire single story extensions

Steel Beams for Extensions

How Steel Beams
Take Added Loads

Steel beams, openings and support work need planning early so the extension stays properly supported as work moves forward.

quote for single story extension in lincolnshire

Building Regulations for Extensions

What Gets Signed
Off Before Handover

Building regulations cover structure, insulation, drainage and fire safety, with building control checking key stages before  work is signed off.

lincolnshire single story extensions completed in 2025 by sb team

Cost of a House Extension

What Shapes Cost
and Build Timing

Cost and timing depend on size, structure, access, glazing, finishes and approvals, not just the amount of space being added.

single storey extensions in lincolnshire

Receive Your free Detailed Quote for Your Extension

Send your details for a free quote today

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What people ask about extensions

House Extension FAQs

The cost of a house extension depends on size, structure, steel beams, glazing, finishes and access, so a realistic quote needs more than square metres alone.

Approvals, site conditions, inspections and lead times all affect timing, with each build stage shaping how long the work takes from start to sign-off.

That depends on scale, height and design. Some house extensions fall under permitted development, while others need planning permission before work begins.

Most extensions need approval for structure, insulation, drainage and fire safety, with building control checks taking place before the new space can be signed off.

Often, yes, but that depends on layout changes, structural openings and how much disruption the build creates in the parts of the house you still use.

Recent Extension Projects

See How House Extensions Open Up Homes

Browse recent extension projects to see how structure, openings and finishing work turn cramped homes into spaces that feel brighter and easier to use.

House Extension Contractors

Talk Through the Space You Want to Add in your home

Share your layout, priorities and plans, and get clear advice on the next step before drawings, approvals and structural work.

Free Extension Guide

Planning an Extension? Read This First.

Use the guide to compare layout options, check approvals and spot cost pressure points before you commit to drawings, quotes or the build route.

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extensions by sb construction

Request your free guide before drawings, quotes and approvals start shaping the extension.

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