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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,544 companies indexed · Last updated: today
DirectoryCrafts & TradesMetal ConstructionVernierALFER CONSTRUCTIONS SA
ALFER CONSTRUCTIONS SA Logo
Verified· 3 sourcesTrust Score
Summary

About the company

The core activity of Alfer Constructions SA is metal construction, including the planning, manufacturing and assembly of metal structures, locksmithing, carpentry and exterior fittings.

AI-generated
Offering

Products & services

Industry:Metal Construction
✓ Offered10
Metal construction
Design, manufacture and installation of custom metal structures for industrial, commercial, public and residential buildings, with support from concept to completion.
Metal trusses
Custom metal trusses for industrial buildings, extensions, structural reinforcement, renovation, awnings, pergolas, covered areas, posts, masts and antenna frames.
Aluminium joinery
Custom aluminium joinery for facades, curtain walls, glazed roofs, shopfronts, doors, windows, balustrades and minimalist profiles, with prefabrication in the workshop.
Locksmithing
General locksmithing for staircases, doors, shopfronts, glazed structures, balustrades, barriers, gates, fencing and closures, including fire-rated and security elements.
Sheet metalworking
Custom sheet metalworking for outdoor fittings, supports, planter boxes, furniture, decorative items and industrial parts, with laser cutting, bending and rolling.
On-site welding
On-site and workshop welding for steel, stainless steel and aluminium structures, using MIG, MAG, TIG and arc processes, including maintenance and repairs.
Engineering office
Preliminary project work, technical solution and budget research, tenders, technical plans and 3D modelling for metal construction projects.
Emergency service
Locksmith emergency service and small metal repairs: fitting a master lock system, changing locks, opening doors, temporary closures, maintenance and automation.
Outdoor landscaping
Custom outdoor landscaping and urban furniture: benches, waste bins, supports for planting, pergolas, privacy screens, planters, kerbs and retaining structures.
Glazing
Custom glazing for shop windows, glazed roofs, glass balustrades, glazed frames, doors, partitions and fire-resistant glass, with emergency service.
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4.5/5

ALFER CONSTRUCTIONS SA

Trust & reputation

ranQ Trust Score of ALFER CONSTRUCTIONS SA: 4.5 out of 5.0

Trust Score4.5/ 5.0

Excellent

x

Data basis 96% · As of October 2026

ALFER CONSTRUCTIONS SA scores 90.3 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.92.924%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.93.810%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.78.08%
ALFER CONSTRUCTIONS SA scores 89.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.70.07%
ALFER CONSTRUCTIONS SA scores 85.0 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
x
CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).85.022%
ALFER CONSTRUCTIONS SA scores 25.7 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.25.74%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

ALFER CONSTRUCTIONS SA reaches a ranQ Trust Score of 4.5 out of 5.0 — rated «Excellent». The rating draws, among other things, on 5.0 out of 5 stars from 39 customer reviews. The data basis is 96%, so the score is backed by part of the criteria. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
5
of 5

Aggregated from 39 reviews across all connected sources

Sources
GGoogle539
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Knowledge

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Location

Chemin de Champs-Prévost 14
1214 Vernier
Opening hours
Mon
07:00 - 12:00, 13:00 - 16:00
Tue
07:00 - 12:00, 13:00 - 16:00
Wed
07:00 - 12:00, 13:00 - 16:00
Thu
07:00 - 12:00, 13:00 - 16:00
Fri
07:00 - 12:30
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-103.762.615
Founded
1990 · 36 years
Last commercial register change
September 17, 2026
Employees
11 to 20
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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