NEED A QUOTE ?
Get in Touch
We deliver home extensions and house conversions built with care and clear planning. Our experienced team manages design, permissions and construction in house, keeping every stage simple and well organized. We focus on high build standards, honest timelines and clear extension quotes, creating extra space that feels natural, practical and built to last, with reliable guidance at every step.
Every project includes a ten year structural guarantee for long term peace.
You get a clear, fixed quote before work starts with no hidden costs.
We handle planning permission and building control so you stay stress free.
Our in house designers create planning ready drawings that are easy to follow.
Options for Home Extensions & Conversions
All types of home extensions and house conversions to suit your taste and lifestyle:
Add bright open living space with smart layout and plenty of light.
Rear Extension and side areas to improve space flow and daily living.
Convert unused garages into practical rooms for daily use.
Create more bedrooms upstairs and living space below in one build.
Turn unused loft space into bedrooms offices or family rooms.
Increase single level living space with rear or side extensions.
Free Site Appraisal
On site assessment of access, structure, services, and ground conditions to plan your extension or conversion accurately.
Design & Approvals
Complete design drawings, cost planning, and handling of planning permission or building regulations approval.
Snag-Free Handover
Final inspections, certifications, warranties, and a full homeowner handover for peace of mind.
Many single storey extensions fall under Permitted Development, however limits on height, depth, roof form, or boundary distances may require full planning permission. Double storey, side, loft, and wrap around extensions usually need consent. We manage submissions through the Planning Portal, monitor timeframes, and advise on design rules, overlooking, glazing, and heritage constraints. Planning permission is required where PD limits are exceeded, within Conservation Areas, Article 4 zones, or for complex extension layouts.
Permitted Development allows certain extensions and conversions to proceed without full planning permission, provided strict size, height, roof, and boundary limits are met. We assess your property’s eligibility, neighbour impact, and design compliance before preparing drawings and required notifications. Our team submits applications where needed, liaises with local authorities, and tracks decision timelines to ensure your project proceeds lawfully and without unnecessary delays.
All extensions and conversions must comply with Building Regulations covering structure, insulation, fire safety, drainage, and energy performance. We arrange structural calculations, SAP assessments, and required inspections throughout the build. Our team coordinates with building control to manage approvals, resolve inspection notes, and secure final certification. You receive full completion documents confirming your new space is safe, compliant, and ready for use.
Works to listed buildings require Listed Building Consent to protect their historic and architectural character. We review listing details, assess proposed alterations, and prepare heritage statements with supporting technical drawings. Our team submits applications, liaises with conservation officers, and manages approval timelines carefully. This ensures extensions or conversions are carried out sensitively, compliantly, and in line with conservation requirements.
Get in touch today for a free detailed quote
Contacting SB Construction
The extension cost depends on the size, design, materials, and type of home extension. Structural work, site access, and the level of finish also affect the final price. Good planning helps keep costs controlled.
In most cases, you can stay in your home during house extensions. Work is planned in stages to reduce disruption. For larger projects like a loft conversion, a temporary move may be advised.
The process starts with a site survey, followed by design and planning approval. Structural work comes next, then construction and final finishes. Each stage is managed carefully from start to finish.
Some extensions fall under permitted development and do not need planning permission. Larger or specific designs may require approval. This is checked at the early planning stage.
Yes, most homeowners remain in the property during a home extension. Living areas are kept safe and separate where possible. Even during a kitchen extension, the team works to minimize daily disruption.
Extensions & Conversions
A gallery of completed extensions, loft conversions and wrap‑around builds.
Get in Touch
Contact our team today for plot advice and a detailed building contractors quote.
SB Construction | Free Guide For Homeowners
Before you sign anything or choose a builder, get the inside secrets on the biggest budget mistakes & how to avoid them.
SB Construction started with Sam’s passion for building and renovating homes. SB are now the trusted building company for Homeowners across Lincolnshire.
Copyright © 2026 SB Construction. Powered By Cloudlinemedia.
