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Brick Construction

Extensions

House Extensions in Suffolk – Built Properly, Without the Stress

At Osborne Building & Renovations, we specialise in house extensions across Suffolk, helping homeowners create more space without the stress, confusion, or unexpected costs that often come with building projects.

 Click here to view our work

We keep things simple:
✔ Clear quotes
✔ Proper planning
✔ High-quality workmanship
✔ No surprises

What We Do

We handle everything from start to finish, including:

  • Single-storey extensions
  • Double-storey extensions
  • Kitchen extensions & open-plan living spaces
  • Rear and side return extensions
  • Structural alterations (RSJs, knock-throughs)
  • Full project coordination

Whether you already have plans or are just exploring ideas, we’ll guide you through the process step by step

What Makes Us Different

1. Clear & Transparent Pricing

We take a detailed approach to quoting so you know exactly what’s included before work begins.
No vague estimates. No hidden extras.
We do not expect your price to increase unless:
-You request changes
-Unforeseen structural issues arise

2. We Work Around Your Budget

Have a number in mind? Tell us.
We’re happy to suggest practical alternatives and solutions to help keep your project within budget — without cutting corners.

3. Fully Managed From Start to Finish

We don’t just “turn up and build”.
We can liaise with:
-Structural engineers
-Building Control
-Architects
Ensuring your project runs smoothly and meets all regulations.

*We have a trusted list of professionals we use for the above, please get in touch to find out more*

4. Quality, Guarantees & Peace of Mind

When you work with us, you’re fully covered:
 ✔ 12-month workmanship guarantee
 ✔ 7-year structural guarantee
 ✔ Manufacturer warranties on all supplied products
 ✔ £2 million public liability insurance
All work is carried out by qualified, experienced tradespeople who take pride in what they do.

5. A Smooth, Well-Run Build

We know building work can be disruptive — so we make it as easy as possible.
You can expect:
-A clean, organised site
-Regular updates throughout the project
-A clear schedule before work begins
-Minimal disruption to your day-to-day life
-No chasing. No guessing what’s happening next.

How Payments Work

We keep everything straightforward:
  • Materials are paid upfront (to secure availability, start dates and material pre-orders)
  • Labour is invoiced weekly during the build
  • Any changes are agreed in writing before work starts
  • You stay fully in control of costs at all times.

Our Process 

1. Initial Chat
We discuss your ideas, budget, and what you’re looking to achieve.

2. Site Visit
We assess the property and provide practical advice.

3. Detailed Quote
You receive a clear quote with a separate breakdown of what is included.

4. Planning & Preparation
We help coordinate everything needed before work begins.

5. Build Phase
Structured, organised, and professionally managed.

6. Completion
Final checks, certification, and handover.

Cost Calculator Guide

Planning an extension but unsure on cost?

Use our simple guide below to get a rough idea of price per square metre based on the type of space and level of finish.

  ⚠️  Every project is different — this is a guide only to help set expectations before receiving a detailed quote. ⚠️ 

Price Bands 
🟢 Basic Build

£1,800 – £2,200 per m²
 
(Excluding VAT)

Suitable for:
Simple extensions
Standard finishes
Minimal structural complexity
Typically includes:
Basic space e.g. dining room
Standard electrics & plumbing
uPVC windows & doors
🟡 Mid-Range (Most Common)

£2,200 – £2,800 per m² 

(Excluding VAT)

  Suitable for:
Open-plan kitchen/diners
Bi-fold / sliding doors
Better quality finishes
Typically includes:
Steelwork (RSJs)
Larger openings
Modern layouts
Mid-range kitchen & flooring
👉 Most of our projects fall into this category
🔴 High Specification

£2,800 – £3,500+ per m²

(Excluding VAT)
 
Suitable for:
Large open-plan spaces
Premium finishes
Complex structural work
Typically includes:
Roof lanterns / large glazing
Bespoke kitchens
Underfloor heating
High-end materials throughout
 
             Costs can increase depending on:
​​
  • Ground conditions / foundations
  • Structural complexity
  • Steelwork requirements
  • Bespoke glazing
  • Landscaping / patios
  • Kitchen & interior finishes
Fill out the form below to begin your new project with Osborne Buildings & Renovations

Let’s Work Together

Get in touch so we can start working together.

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