Builder
JMB Design & Build
Credentials & registries
1 named source
Trust score
68out of 100
Rating5.0★
Review volumeLow · 5
Source diversity3 sources
VerificationVerified
Based on rating, review volume, independent sources and verification. Evidence context — not a guarantee of workmanship.
Trust at a glance
1 checkWhat we can verify about JMB Design & Build
Each card summarises one evidence dimension from public sources — open it for the full detail and named source. This is evidence context, not a guarantee.
See the full verification checklist for JMB Design & Build →Credentials and associations
1Named registry and membership evidence
Official or controlled checks carry the strongest weight here. Listed, missing, and ambiguous evidence stays visibly weaker than a verified pass.
Planning evidence
Nearby projects
Checking nearby planning applications.
About
Verified in Hatfield, Hertfordshire.
Reviews · public evidence
What customers say
5.0out of 5
Highlights
"JMB’s unofficial motto is “it’s all in the details” and it couldn’t be more accurate…from steel girders to mastic to the tiniest bit of grout between tiles, no detail is left ignored. The builders themselves were all lovely and a pleasure to see every morning. I’ll actually miss them now that it’s over. I would have no hesitation in recommending JMB for any work needed, I’ve not even been asked or prompted by JMB in anyway whatsoever to even write this review, this is all a genuine account of the entire project. JMB – not 5 stars, but the coveted 6th! It’s been a pleasure!"
"JMB Design and Build are the most trustworthy people in this area. I had a house extension done. They responded to my queries promptly, completed the project within the budget (including minor additions to the scope of works) and in a very reasonable timeframe. The workers treated my house and family with at most respect. We continued to live in the liveable area and work itself progressed without any disruption. I carried the design via an external architect. In the hindsight I will most definitely request the design from JMB’s firm directly. Since they took care of all the inspections required"
"The patio has been worked on promptly and to high standard. James has been helpful throughout the process. The whole team has been mindful about being tidy and our neighbours."
Detailed reviews
Showing the 3 reviews we hold full text for. The 5 headline total is the review volume reported across JMB Design & Build’s public review sources.
JMB’s unofficial motto is “it’s all in the details” and it couldn’t be more accurate…from steel girders to mastic to the tiniest bit of grout between tiles, no detail is left ignored. The builders themselves were all lovely and a pleasure to see every morning. I’ll actually miss them now that it’s over. I would have no hesitation in recommending JMB for any work needed, I’ve not even been asked or prompted by JMB in anyway whatsoever to even write this review, this is all a genuine account of the entire project. JMB – not 5 stars, but the coveted 6th! It’s been a pleasure!
JMB Design and Build are the most trustworthy people in this area. I had a house extension done. They responded to my queries promptly, completed the project within the budget (including minor additions to the scope of works) and in a very reasonable timeframe. The workers treated my house and family with at most respect. We continued to live in the liveable area and work itself progressed without any disruption. I carried the design via an external architect. In the hindsight I will most definitely request the design from JMB’s firm directly. Since they took care of all the inspections required
The patio has been worked on promptly and to high standard. James has been helpful throughout the process. The whole team has been mindful about being tidy and our neighbours.
Local context
Rated 5.0★ — in line with the local average for builders in Hatfield
Across 13 rated builders in Hatfield, the typical rating is 4.9★. We compare against the same businesses a homeowner would find searching for this trade locally.
Public evidence checks
Public evidence shownTrust checks and red flags
Public review evidence5.0★ from 5 public reviewsAcross CheckatradeCheckatradeCompanies HouseCompanies House OfficersWaste carrier (Environment Agency)
Sources
3 named sourcesEvery signal, traced to its origin
Review sources
Official sources
Public evidence checks
What's strong, and what to check yourself
✓Strong signals
✓Rating: 5.0★
✓Source diversity: 3 sources
✓Verification: Verified
✓1 verified credential
!Worth checking yourself
!Review volume: Low · 5
Smart checks
Before you hire a builder
Never pay a large deposit up front — agree a staged payment schedule tied to completed milestones, and hold a small retention until snagging is done.
Get it in writing: an itemised quote with scope, materials, start and finish dates, and how any changes (variations) will be priced.
Be wary of a cash-only price or pressure to start tomorrow — both are red flags for an unaccountable job.
Ask to see a portfolio of completed work like yours, plus recent references you can contact.
Check the credentials and registrations that matter for this work — and that they are current.
Good to know
Common questions about JMB Design & Build
What do customers say about JMB Design & Build?
JMB Design & Build has 5 public reviews, averaging 5 out of 5, gathered across 3 independent sources. You can read the individual reviews and where each came from in the reviews section above.
How do I know JMB Design & Build's reviews are genuine?
JMB Design & Build's 5 public reviews are gathered and cross-checked across 3 independent public sources. Reviews spread across several named sources are harder to fake than a single polished page. MyTrustedTraders brings this public evidence together with no ads and no paid placement: we show where every review came from rather than selling rankings, so you can weigh the evidence for yourself.
Is JMB Design & Build qualified and accredited?
We hold 1 independently sourced credential for JMB Design & Build, including Waste carrier (Environment Agency). Each is attributed to the body that issued it in the credentials section.
Want an extra legitimacy check?
Run the Cowboy Checker on JMB Design & Build before you contact them.
