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Planning more space without the stress of moving? Our home extensions and house conversions give you the square footage you crave while adding lasting value. SB Construction issues fixed‑price quotes, films daily progress and backs every project with a ten‑year structural warranty. From the first brainstorming session and extension design tips to final sign‑off, every stage is delivered in‑house for total peace of mind.
Every project carries our ten‑year structural warranty for lasting reassurance.
Receive a fully itemised extension quote or conversion quote before work begins.
We manage extension planning permission and building‑control approvals for you.
Architectural technicians produce planning‑ready drawings and 3‑D visuals.
Options for Home Extensions & Conversions
All types of home extensions and house conversions to suit your taste and lifestyle:
Add open-plan living space filled with natural light.
Maximise rear and side footprint for seamless indoor-outdoor flow.
Create insulated studios, gyms or guest suites from unused garages.
Gain bedrooms upstairs and family rooms below in one build.
Turn empty lofts into bright bedrooms, offices or play areas.
Expand single-level living with rear or side additions.
Free Site Appraisal
initial visit to assess access, services and ground conditions.
Design & Consent
full plans, cost schedule and management of planning permission for new build.
Snag-Free Handover
detailed inspection, 10-year warranty pack and homeowner manual.
Many single‑storey extensions fall under Permitted Development, yet height, roof style or proximity to boundaries may trigger a full application. Double‑storey and wrap‑around builds almost always require consent. Submissions are made through the Planning Portal and we track statutory timeframes, giving you clear guidance on ridge heights, glazing ratios, overlooking rules and heritage constraints. Planning Permission required when PD limits exceeded, in Conservation Areas/Article 4 zones or for two-storey/side extensions.
Unlock your right to carry out extensions and conversions under Permitted Development, bypassing full planning permission for qualifying works. SB Construction checks size, height and neighbour impact limits, preparing all needed drawings and notifications. We submit your application, liaise with local authorities and track decision periods for stress-free approval.
Every extension or conversion must meet structural, thermal, fire and drainage standards. We arrange structural steel calculations, SAP energy models, air‑tightness tests and sound‑insulation reports. Our supervisors schedule foundation, insulation and final inspections with building control and close any action notes swiftly. You receive a signed completion certificate plus Part P electrical and Gas Safe documentation, proving that your new space is safe, efficient and mortgage‑ready. Building Regulations always needed for structural openings, insulation, joists, staircases, etc.
Carry out Extensions and Conversions to a Listed Building only with proper Listed Building Consent, ensuring alterations respect its architectural and historic interest. SB Construction evaluates the building’s listing details and works scope, producing comprehensive heritage statements and technical drawings as required. We submit your application, engage with conservation officers and track decision deadlines to deliver efficient approval.
Get in touch today for a free detailed quote
Contacting SB Construction
Complete the form for a free extension survey, scope assessment and fixed-price proposal.
Size, build method, materials and specification drive the budget; we issue a detailed extension cost guide.
Most clients remain at home. We isolate dust, set up temporary services and schedule noisy work considerately.
Structural alterations, first-fix, insulation, plastering, second-fix and snagging, each inspected in sequence
Many extensions fall under permitted development, but larger builds or listed properties may require planning permission. Our team handles all planning and building control steps for you.
In most cases, yes. Especially for single-storey rear extensions. We use dust partitions and manage trades efficiently to minimise disruption, and you’ll receive daily progress updates from your project manager.
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 started with Sam’s passion for building and renovating homes. SB are now the trusted building company for Homeowners across Lincolnshire.
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