Design Spec Ltd
Architectural Services. Design Spec Ltd has been vetted and approved by TrustATrader. Covering Brentwood, Billericay, Romford and surrounding areas.
Membership number TT12341
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Register GuaranteeAbout Design Spec Ltd, Brentwood
Architectural Designer in Brentwood | Fixed Fee | Design Spec
Design Spec is a specialist residential architectural design practice serving Brentwood and the surrounding Essex area. We help homeowners plan, design and gain approval for loft conversions, house extensions, garage conversions and major home renovations - all on a transparent fixed fee, with no hourly billing and no hidden costs.
Every project includes planning permission drawings, building regulations packages, and a free introduction to vetted local builders through our Connect network once your plans are approved.
Our Brentwood services include:
- Loft conversions: dormer, hip-to-gable, mansard
- Single and double storey rear extensions
- Side return and wraparound extensions
- Garage conversions and outbuildings
- Planning permission applications
- Building regulations drawings
- Structural calculations
- Party wall surveying
Why homeowners in Brentwood choose Design Spec:
- Fixed fee from day one - same-day written quote, no surprises
- Unlimited design revisions included as standard
- Planning applications handled end to end
- Structural calculations and party wall surveying available
- Free introduction to trusted, vetted local builders once approved
- 10+ years experience, hundreds of completed projects across Essex
- One-to-one project management throughout
Areas we cover from Brentwood:
Brentwood · Shenfield · Warley · Ingatestone · Ongar · Epping · Loughton · Theydon Bois · Buckhurst Hill · Chigwell · Gidea Park · Romford · Billericay · Herongate · Doddinghurst
📞 01702 567955
✉️ info@designspec.co.uk
🌐 designspec.co.uk
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
Essex
Insurance details
| Provider | Hiscox Insurance Company Ltd |
|---|---|
| Verified | 30th June 2026 |
Associations
Reviews (98)
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Average rating: 5.0 out of 5
Review by Hari
on 21st September 2026
"Working closely with Lauren for quite a few months on my plans for extending my home. She has been remarkable and so patient. The key thing to Lauren and the team at DesignSpec. Is that it is no hard sell or push from them. Their approach is calm, professional from the very first call, to meet up and then subsequent discussions. Planning is tricky and where I live it is particularly a fine line of acceptance or not. So, I can only recommend the experience, professional and steady support of Lauren and DesignSpec. Really the best choice and decision I made in choosing them over anyone else."
- 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 Sazan
on 20th August 2026
"We are very pleased with the service design spec has offered us. Thank you to Lauren, who handled our project she was very accommodating."
Trader reply: "Thank you for the feedback! We really appreciate you taking the time to leave us a review and are pleased you were happy with the service and support from Lauren."
- 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 Shirley
on 30th July 2026
"Design spec are a very professional architectural outfit that takes on board your full requirements with the understanding of the clients design specification details."
Trader reply: "Thank you for your review, we’re really pleased to hear this and look forward to continuing to support you throughout the process."
- 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: 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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