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General Contractor Professional

Duo Building Ltd logoDuo Building Ltd

London, ON
Compare with similar general contractor providers in London →
WSIB
+1 519-434-0960 Website(opens in new tab)
1 Credential Verified
ProScore
4.5★ Google|1/4 Sources

This score reflects 25 verified reviews, licensed and verified.

How is this calculated?
Data verified: Jun 2026

About Duo Building Ltd

AI-generated summary from verified data sources

Based in London, Duo Building Ltd is a professional general contractor serving the local area. Their 4.5★ Google rating is backed by 25 customer reviews.

G
Google
4.5★ (25)
Rated on 1 independent platform
WSIB coverage confirmed

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What Customers Say

AI analysis of 3-4 verified Google reviews

Top Strengths

Exceptional workmanship and attention to detail - described as having 'exceptional knowledge, workmanship and eye for details'
Creative design and planning - 'provided detailed and creative plans' with ability to understand client needs
Well-organized project management - clients noted projects were 'well organized' with knowledgeable and efficient employees

Areas to Watch

Poor initial communication responsiveness - one client reported waiting three weeks without response to email and phone inquiries
Inconsistent communication follow-up despite owner's claimed July 23rd outreach
workmanshipdesign qualityproject organizationattention to detailcommunication gaps

Ratings Across Platforms

Aggregated from independent sources. Only ProScore shows all.

1 of 4 verified
G
Google
4.5/5
B
Review Site B
Not found
B
BBB
Not found
C
Review Site C
Not found
The ProScore Trust Score aggregates ratings from all verified sources, weighted by review volume, recency, and platform credibility.

Things to Know

Well Reviewed

4.5 star average on Google with 25 reviews.

WSIB Verified

Workplace Safety and Insurance Board coverage confirmed — you're protected.

Google Review Breakdown

25 total
5
21
4
1
3
0
2
0
1
3

Featured Review

Verified review from Google

“

Amazing, stunning, beautiful are the words coming to my mind when I step through my front door. It looks like a picture out of a magazine. Duo Team you have done an outstanding job from design to finish Many thanks to John & Erin for the help and guidance through the many selection I had to make. A special "thank you" to Spencer whose knowledge, workmanship and eye for details are exceptional. Also thanks for the laughs and keeping my house clean throughout the renovation. Many thanks from a

E
Erika Palme
Google Review

Other top rated general contractor in London

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66
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5(21)
True North General Contractors Inc
66
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4.9(35)
Babylon Construction
66
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4.9(79)
Opal Building Co.
65
London
5(20)

Homeowner Guides

How much does this service cost in Ontario?Red flags when hiringGeneral Contractor FAQs in LondonView all guides →

Frequently Asked Questions

Is Duo Building Ltd licensed?
Licensing status has not been verified for Duo Building Ltd. Contact them directly to confirm current credentials before hiring.
Does Duo Building Ltd have insurance?
Yes, Duo Building Ltd has verified WSIB (Workplace Safety and Insurance Board) coverage, which protects homeowners from liability if a worker is injured on the job.
What is Duo Building Ltd’s rating?
Duo Building Ltd has a ProScore Trust Score of 60/100 (Good), calculated from 1 verified data source including 25 Google reviews.
Where is Duo Building Ltd located?
Duo Building Ltd is a general contractor serving London, Ontario. You can reach them at +1 519-434-0960. View their full profile on ProScore for verified reviews and credentials.

Business Details

663 Central Ave, London, ON N5W 3P7
General Contractor
View on Google Maps

Hours

Friday8a.m.-4p.m.
Monday8a.m.-5p.m.
SaturdayClosed
SundayClosed
Thursday8a.m.-5p.m.
Tuesday8a.m.-5p.m.
Wednesday8a.m.-5p.m.

Services Offered

Home renovationsAdditionsNew constructionProject managementPermit acquisitionDesign-build

Services & Info

Accessibility

Wheelchair-accessible parking lot

Credentials

Insurance
Not Confirmed
WSIB Coverage
✓ Confirmed

ProScore displays credential information as reported by contractors and third-party sources. Homeowners are encouraged to independently verify all credentials, licenses, and insurance prior to engaging any contractor.

Data Transparency

SourcesGoogle and Ontario regulatory records
Last updatedJune 2026

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Checked by ProScore

What is the ProScore?

The ProScore aggregates ratings from multiple review platforms into a single score from 0 to 100. Unlike platforms that show only their own reviews, the ProScore gives you the complete picture. Scores are capped for providers with limited source verification.

≥80
Elite
≥65
Trusted
≥50
Good
≥30
Basic
<30
Caution

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