Public evidence profile

Core Sash Windows

Carpenter / joinerLondon4.663 reviews · 2 independent public sources
Companies House
Status needs a check
Credentials & registries
2 credentials shown
Trust Score
20out of 100
Very little to go on

20 out of 100: an official register lists this business as no longer trading normally, which caps the score at 20 whatever the reviews say.

  • Rated 4.6 from 63 reviews
  • 2 credentials shown
How this score is worked out
Rating4.6 / 5
Review volume63
Independent sources2 independent public sources
Credentials2 credentials shown

Based on rating, review volume, independent sources and credential evidence. Evidence context, not a guarantee of workmanship.

Trust at a glance

What we can verify about Core Sash Windows

2 checks

Each card sums up one thing we can check from public sources. Open it for the full detail and the named source. This is evidence context, not a guarantee.

Companies HouseStatus needs a checkSee detail →Credentials & registries2 credentials shownSee detail →
See the full verification checklist for Core Sash Windows →
Reviews · public evidence

What customers say

These review totals are published independently on the named public source below, not testimonials this business chose to show. We show the aggregate rating, review volume, and source attribution we hold so you can weigh the evidence yourself.

4.6out of 5
63 reviews in public evidence
Customers often mention
  • Fast & efficientMentioned in 36% of reviews we've read
  • ProfessionalMentioned in 32% of reviews we've read
  • Friendly & politeMentioned in 28% of reviews we've read
  • Tidy & cleanMentioned in 28% of reviews we've read
Where these reviews are published
  • Which? Trusted Traders63 reviews · 4.6 avg
From customer reviews

What customers consistently say

Recurring themes from 25 customer reviews on Which? Trusted Traders.

Respectful and tidy in your home: “The fitters were a pleasure to have in the house and they left everything in excellent condition.” · Which? Trusted Traders

Reliable and punctualQuoted from 3 reviews

“The installation team arrived on time” · Which? Trusted Traders

“The job was scheduled and completed on time” · Which? Trusted Traders

“They stuck to their proposed timetable” · Which? Trusted Traders

Credentials and associations

Credentials and memberships

2

These credentials and memberships are attributed to named public sources. Check the source before relying on them.

Companies House registration

Company status needs a careful check

Dissolved

Core Sash Windows is linked to a Companies House entry. This shows the business registration, not evidence of workmanship or service quality.

Dissolved
Legal nameCore Sash Windows
Company number08935271
IncorporatedNot listed
Official checkOn the public register

What the flags above mean: the official register records this company as no longer active. Work may still be offered under this name, but the registered entity behind it cannot be held to account the way an active one can. Confirm exactly who you would be contracting with before any money changes hands.

Source-listed gallery

Photos listed on Which? Trusted Traders

10 photos

These sources do not label every image as completed work. The gallery may include projects, people, logos or certificates, so it does not count as completed-work evidence.

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From Which? Trusted Traders

Opening hours

The hours this business publishes online, handy for knowing when to call. Confirm before you set off.

Monday–Friday
8:30am–5:30pm
Sources

Where this information comes from

4 named public sources

Everything on this page is drawn from named public sources. Where a source provides a public link, you can open the original and dig deeper.

Review sources

Registers and membership directories

Business and public registers

Check dates vary by source. Where we hold a date, the check shows it.

About

Core Sash Windows is a London-based double-glazing company specialising in the replacement and repair of traditional timber-framed windows and doors. We understand that replacement windows and doors are an important investment, and you obviously want to make the correct choice. That is why we offer: • Elegant and traditionally styled products • Attentive customer care • Punctuality and reliability • Considerate workmanship • Convenient and fully comprehensive service • No need for Third Party trades That is why we promise: Our surveys are always performed by experienced carpenters instead of designated sales-people - there's no unnecessary up-selling and no high-pressure tactics. Our FENSA-registered installation service also includes the hand painting of your new products, traditional sand-and-cement pointing joints, and the repair of any damaged plaster. And our traditionally designed windows and doors come with a 10 Year Insurance-Backed Guarantee.

Services they list

Sash windowsTimber windowsWindow consultantsReplacement window services and repairsDouble glazing installationAluminium WindowsDouble glazed unitsDouble glazing repairDouble glazing suppliersDouble glazing repairsJoinery and carpentryBi-fold doors

Listed on public sources or the business's own website; check directly that they cover your job before you book.

What this business says about itself
From their own website

What this business says about itself

See their work: Houzz (opens in new tab) · Instagram (opens in new tab) · Facebook (opens in new tab) · Pinterest (opens in new tab)

Accreditations it displays. Confirm each is current on the official register before you hire:

These are statements the business makes on its own website, worth confirming in writing (and on the official registers) before you hire, not independently verified by us.

Independent checks

About this business

Website online sinceTheir website domain has been registered since 2008, according to the public domain registry. This dates the website, not necessarily the business.
Your own checks

What to check before you hire

Worth checking yourself
Always confirm credentials and quotes with the business directly before hiring.
Look for consistent reviews across several named sources, not one polished profile.
Check any credential evidence, and that the business details independently check out.
Get a written quote and keep guarantee, insurance and payment terms in writing.

Want an extra legitimacy check? Run the Cowboy Checker on Core Sash Windows before you contact them.

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Good to know

Common questions about Core Sash Windows

Is Core Sash Windows a legitimate business?

Core Sash Windows has 63 independent public reviews, rated 4.6 out of 5. Its registration on Companies House currently needs a careful check (Dissolved), so weigh the reviews alongside that. This is independent public evidence gathered from named public sources (no ads, no paid placement), not a guarantee of workmanship. If anything here is out of date, the business can request a correction.

What do customers say about Core Sash Windows?

Core Sash Windows has 63 public reviews, averaging 4.6 out of 5. The reviews section shows the aggregate rating, review volume, and review source information we hold.

How do I know Core Sash Windows' reviews are genuine?

Core Sash Windows' 63 public reviews come from a named public review source. MyTrustedTraders brings this public evidence together with no ads and no paid placement: we show the review source information and aggregate rating we hold rather than selling rankings, so you can weigh the evidence for yourself.

Is Core Sash Windows qualified and accredited?

We hold 2 independently sourced credentials for Core Sash Windows, including FENSA, Which? Trusted Trader. Each is attributed to the body that issued it in the credentials section. For example, FENSA is the competent-person scheme for replacement windows and doors, self-certifying they meet building regulations.

Is Core Sash Windows a registered business?

Core Sash Windows appears on Companies House (company number 08935271), but its registration status needs a careful check. Worth checking: Dissolved. This confirms the legal registration of the business, not evidence of workmanship or service quality.

What does Core Sash Windows specialise in?

Core Sash Windows lists specialist services including Sash windows, Timber windows, Window consultants, Replacement window services and repairs, Double glazing installation, Aluminium Windows. If your job is one of these, look for it in their listed services or ask them to confirm for your project.

When was Core Sash Windows' website registered?

Core Sash Windows' website has been online since 2008, according to the public domain registry. This dates the website, not necessarily when the business began trading.

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