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 (95)
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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: 5.0 out of 5
Review by Emina Poljak
on 21st July 2026
"We had plans drawn up for both a loft conversion and a garage conversion, and we couldn't be happier with the service. From the initial consultation through to the final drawings, everything was handled professionally and efficiently. The plans were well thought out, our ideas were listened to, and we were given helpful suggestions to make the best use of the space. Communication was excellent throughout, and the whole process was smooth and stress-free. We would highly recommend their services to anyone looking for architectural drawings or planning advice."
Trader reply: "Thank you for your review. We’re really pleased you were happy with the service and the plans for your loft and garage conversions. We really 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: 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 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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