Design Spec Ltd
Architectural Services. Design Spec Ltd has been vetted and approved by TrustATrader. Covering London and the Home Counties
Membership number TT12341
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Register GuaranteeAbout Design Spec Ltd, St. Albans
Fixed-Fee Architectural Design for Essex & Hertfordshire
Loft conversions, house extensions, garage conversions with same-day quotes. No hourly billing, no hidden costs. Planning permission & building regulations included. Every project comes with free vetted builder introductions through our Connect network.
✓ Fixed-fee pricing (transparent, no surprises)
✓ Planning applications & building regs drawings included
✓ Structural calculations & party wall surveying
✓ Trusted local experts serving South East
✓ Free intro to vetted local builders once approved
Why Design Spec?
Same-day fixed quotes
Unlimited design revisions included
Planning permission paperwork handled
Direct access to trusted builder network
10+ years, 100s of completed projects
Serving: St Albans | Harpenden | Welwyn Garden City | Hatfield | Hertford | Ware | Potters Bar | Broxbourne | Hoddesdon | Hitchin | Stevenage | Watford
Contact us today!
Website: www.designspec.co.uk
Email: info@designspec.co.uk
Telephone: 01702 567955
Photo gallery
Complete Home Renovation
16 photos
Contemporary Luxury Loft Conversion
9 photos
Premium Light-Filled Extension
10 photos
Elegant Dining Room Extensions
14 photos
Contemporary House Extensions
11 photos
Luxury Living Spaces
12 photos
Bespoke House Extensions
13 photos
Open Plan Living in Essex
10 photos
Modern Kitchen Extension
8 photos
All other media
122 photos
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Design Spec Ltd
- Identification checked
- Company address verified
- Customer references checked
- Agreed to TrustATrader's high standards
- Agreed to complaints procedure
Hertfordshire
Insurance details
| Provider | Hiscox Insurance Company Ltd |
|---|---|
| Verified | 30th June 2026 |
Associations
Reviews (94)
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Average rating: 4.83 out of 5
Review by Ben
on 29th July 2026
"Design Spec have been great to work with. Extremely informative at the early stages of the process, offering lots of advice and guidance where needed. Would highly recommend - very punctual and easy to get hold of."
Trader reply: "Thank you for the review! We’re really pleased the team could provide the advice and guidance you needed from the early stages. It’s great to hear that communication was easy and reliable throughout. We appreciate your recommendation!"
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 4 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
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Average rating: 4.83 out of 5
Review by Simon
on 21st July 2026
"Marcus has been great in understanding out requirements and has successfully created our preplannig application."
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 4 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
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Average rating: 5.0 out of 5
Review by Jay
on 20th July 2026
"Marcus from Design Spec has been very helpful and professional throughout our design and planning permission process, keeping us up to date with the progress and assisting with various questions and guidance along the way. Would recommend Design Spec for your architect/design needs!"
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
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Average rating: 5.0 out of 5
Review by Paolo Cosentino
on 13th July 2026
"Fast and reilable"
- Initial impression Initial impression: 5 out of 5.0
- Punctuality Punctuality: 5 out of 5.0
- Cleanliness Cleanliness: 5 out of 5.0
- Quality Quality: 5 out of 5.0
- Value Value: 5 out of 5.0
- Overall opinion Overall opinion: 5 out of 5.0
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