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Hampshire Extension Designer — Fixed-Fee Design Packages
Planning drawings · Building regulation drawings · Structural calculations
No hourly rates, no hidden costs. Our extension designer packages cover everything from planning drawings through to full building regulation drawings. Calculate your total extension cost
Questions about which package is right for you?
- Comprehensive feasibility report
- Professional on-site measured survey
- Expert design consultation
- Detailed planning drawings
- Complete planning application submission
Payment Terms:
- Invoice on instruction — £250 + VAT deposit
- Balance — £1,100 + VAT on issue of first drawings
- Total: £1,350 + VAT
- Everything in Essential Package, plus:
- Full building regulation drawings
- Certified structural calculations
Payment Terms:
- Invoice on instruction — £250 + VAT deposit
- Balance — £1,700 + VAT on issue of first drawings
- Total: £1,950 + VAT
Payment Terms
From £250 to start — balance due on issue of first drawings
Invoice on instruction, balance payable on issue of your first set of drawings
Additional storey: £750 + VAT | Loft conversion: £950 + VAT
Your Free 30-Minute Consultation — Pick a Time That Suits You
Book directly with Mark for a no-obligation call about your project.
- ✅ Realistic cost estimate for your project
- ✅ Planning feasibility for your property
- ✅ Clear next steps — no obligation
⏰ Mark typically books up 7–10 days ahead — grab your slot now
Compare Our Packages
| Feature / Service |
Essential Package
£1,350 + VAT
|
Pre-Build Package
£1,950 + VAT
|
Premium Package
£2,950 + VAT
|
|---|---|---|---|
| Feasibility report | |||
| On-site measured survey | |||
| Design consultation | |||
| Planning drawings | |||
| Planning application | |||
| Building regulation drawings | – | ||
| Structural calculations (qualified engineer) | – | ||
| Schedule of works | – | – | |
| Professional contractor vetting service | – | – | |
| Contractor proposal gathering | – | – | |
| Client-centric building contract between parties | – | – |
Essential Package
Perfect for homeowners who need planning permission
The Essential Package takes you from initial concept through to planning application submission. You'll receive a feasibility study, professional measured survey, design concept drawings, and complete planning submission with us acting as your agent throughout the planning process.
Peace of mind: Fixed-fee pricing means no surprises, and our streamlined process gets you planning-ready drawings without the complexity of traditional architectural services.
Pre-Build Package
Ideal for families ready to start building
Our most popular package includes everything in Essential, plus the critical technical documents needed for construction. You'll receive complete building regulation drawings and certified structural calculations prepared by qualified engineers, making your project build-ready.
Peace of mind: With certified engineer calculations and technical drawings in hand, contractors can provide accurate quotes and your project moves smoothly from planning to construction.
Building regulations drawings included. Building Notice submission is typically handled by your builder.
Premium Package
Contract administration & contractor vetting for busy families
Looking for a professional vetted contractor team? Our Premium Package includes everything in Pre-Build, plus a comprehensive tender process. We prepare a detailed schedule of works and go out to two contracting teams from our vetted panel who specialise in home extensions. Each team undergoes thorough reference checks before being presented to you.
Peace of mind: We establish client-focused contracts between all parties with milestone-based payment terms, protecting you financially throughout the build. You'll never be overexposed, and you'll have professional oversight from design through to construction.
What Hampshire Families Say
"Hampshire Build provide a well designed architectural service that helps demystify the renovation process. Professional throughout."
"Mark and his team made our garage conversion such a smooth and pleasant experience. The quality of building work was superb."
Ready to Transform Your Home?
Start with a complimentary 30-minute consultation to discuss your project and explore your options.