Assessment & Quotation
- Site visit and measurements
- Plan review and feasibility assessment
- Fixed-price quotation delivered
Premium Home Extensions | Hampshire, Surrey & Dorset
Why Choose Crown for Your Extension?
An extension is one of the largest investments you'll make in your home. It's not just about
adding square footage – it's about creating space that transforms how you live, while adding
genuine value to your property.
At Crown Construction, we bring commercial-grade project management to domestic
extensions. That means structural engineers involved from day one, Building Control
consulted before construction starts, and documented quality checks throughout the build.
The result? Extensions that pass inspection first time, complete on schedule, and deliver the
living space you've envisioned.
Working towards
ISO 9001
Standards
Types of Extensions We Build
Single-Storey Rear Extensions
The most popular extension type – opening up your ground floor into a larger kitchen-diner
or family living space. We handle everything from foundations to finishing, including
structural steelwork for those sought-after open-plan layouts.
Typical size: 15-40 sqm | Timeline: 10-14 weeks | Investment: £40,000-£80,000
Double-Storey Extensions
Maximise your building footprint with bedrooms above your ground-floor extension. Doublestoreys require careful structural engineering, but deliver exceptional value per square metre
compared to single-storey builds.
Typical size: 30-60 sqm total | Timeline: 14-18 weeks | Investment: £70,000-£140,000
Wrap-Around Extensions
Combining rear and side extensions creates the maximum ground-floor space. Ideal for
corner plots or properties with generous gardens where you want a dramatic transformation.
Typical size: 25-50 sqm | Timeline: 12-16 weeks | Investment: £55,000-£100,000
Used and loved by people at leading companies
Why Extensions Go Wrong (And How Crown Prevents It)
1: Poor Ground Conditions
Many builders quote without surveying ground conditions. When they hit clay, rock, or high water tables, you face unexpected foundation costs.
Crown’s approach: We assess ground conditions during our initial site visit. If there’s any
doubt, we recommend a soil survey before finalising your quote. No surprises.
2: Building Control Rejections
Rushed submissions lead to rejected applications, causing delays and redesign costs.
Crown’s approach: We consult with Building Control informally before submitting. We
know what local inspectors look for and ensure our plans meet requirements first time.
3: Structural Engineer Delays
Waiting for structural calculations mid-project brings construction to a halt.
Crown’s approach: Structural engineers are engaged during planning, not after construction
starts. Steel specifications, foundation designs, and load calculations are completed before we
break ground.
4: Poor Trade Coordination
Electricians arriving before plastering is done. Plumbers waiting for floor screed to cure. Poor scheduling creates delays and frustration.
Crown’s approach: ISO 9001 scheduling means each trade arrives at exactly the right time.
We manage the sequence; you enjoy the progress.
Premium Finishes with Cladco
Crown Construction partners with Cladco to offer premium exterior finishes for your
extension. Whether you want contemporary composite cladding or traditional timber-effect
panels, Cladco materials deliver stunning aesthetics with minimal maintenance.Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.
Benefits
- 25-year warranty on composite cladding
- Weather-resistant and colour-stable
- Wide range of colours and textures
- Sustainable and recyclable materials
Visit cladco.co.uk to explore finish options.
Your Extension Timeline
Pre-Construction Planning
- Structural engineer engagement
- Building Control consultation
- Materials ordering
Foundations
- Groundwork and drainage
- Foundation pour and curing
- Building Control inspection
Superstructure
- Brickwork and blockwork
- Steelwork installation
- Roof structure
Weathertight
- Roofing and flashing
- Windows and doors
- External finishes
First Fix
- Electrical wiring
- Plumbing and heating
- Insulation
Second Fix & Completion
- Plastering
- Kitchen and bathroom fitting
- Decoration and snagging
- Building Control sign-off
Step-by-Step Process
Initial Contact
Get in touch with us via phone or email to discuss your project.
Initial Quotation
We provide an initial quotation based on available drawings and specifications.
Site Visit
We arrange a site visit to assess the property and discuss the project in detail, answering any questions you may have.
Final Plans & Approvals
Once final plans, calculations, and Building Regulations approval are confirmed, we finalise your quotation.
Agreement & Scheduling
After costs are agreed, we provide a work schedule, payment plan, and a formal contract aligned with the agreed start date.
Project Commencement
Construction begins, delivered by our experienced team with a focus on quality, safety, and clear communication.