Harp Windows (Watford) Ltd

Watford4.9· 67 reviews · 2 sources
Credentials & registries
1 named source
Trust score
86out of 100
Rating4.9★
Review volume67
Source diversity2 sources
VerificationVerified

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About

Established in 1989, Harp Windows (Watford) Ltd is a family run company manufacturing and installing high quality replacement windows, doors and conservatories. Over the years, we've worked hard to build a reputation for professional integrity, efficient customer service, high quality products and value for money. Customer satisfaction is paramount to us, we do everything possible to ensure our customers are delighted with their new windows, doors or conservatory. For further peace of mind our customers are always welcome to visit us at our St Albans Rd showroom, or our factory in Watford, where we manufacture many of our products. There are many good reasons to choose us as your installer, including: * Long established and local, * Members of FENSA, The CPA and Checkatrade, * Hertfordshire Trading Standards Approved, * Our products are fully guaranteed for ten years, * We offer guarantee protection insurance backed warranties, * Comprehensive aftersales service for complete peace of mind.

Reviews · public evidence

What customers say

4.9out of 5
67 reviews in public evidenceCross-checked across 2 sources
Companies HouseSource profile linked
Which? Trusted TradersSource profile linked

Highlights

"We had a new front door, windows and surrounding frames. The team who worked on the project were efficient and polite. The work was carried out in the time scale given and all debris was removed and the property left clean and tidy. Could not fault the company from the Sales team to the installers. Would highly recommend them. We are very pleased with the finished product. Helen - Rickmansworth"

Customer in HertfordshireWhich? Trusted Traders5.0 rating

"We replaced our patio doors and were very pleased with the speed of service and the quality both of the product and the performance of the fitting team."

Customer in HertfordshireWhich? Trusted Traders5.0 rating

"Excellent service from start to finish. Fitter was on time, professional and his standard of work was very high. He was also very clean and tidy."

Joanne, HertfordshireWhich? Trusted Traders5.0 rating

Detailed reviews

Customer in Hertfordshire5.0 / 5

We had a new front door, windows and surrounding frames. The team who worked on the project were efficient and polite. The work was carried out in the time scale given and all debris was removed and the property left clean and tidy. Could not fault the company from the Sales team to the installers. Would highly recommend them. We are very pleased with the finished product. Helen - Rickmansworth

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5

We replaced our patio doors and were very pleased with the speed of service and the quality both of the product and the performance of the fitting team.

Which? Trusted Traders
Michael, Middlesex4.7 / 5

Replaced aging units.

Which? Trusted Traders
Joanne, Hertfordshire5.0 / 5

Excellent service from start to finish. Fitter was on time, professional and his standard of work was very high. He was also very clean and tidy.

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Customer in Greater London5.0 / 5

We set out to have our ancient double glazed units replaced with some trepidation as we are in an older property. We needn't have worried, the service and more importantly, the fitting, was excellent. Our fitter didn't stop from the moment he arrived, he took a real care in making sure the finish was just right and we were also pleased that Harp had recognised on their survey that our old windows were substantially out of fit, hence the reason it was so draughty! We have no hesitation in recommending them, they were to budget and accommodated the date we wanted them to be fitted. Many thanks!

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Customer in Greater London5.0 / 5

Used Harp windows previously to replace double glazed window. This time we was looking for replacement front door. As always staff very friendly, helpful, informative, professional. Always happy to respond to any issues that arise and when they make an appointment to visit always on time, pleasant & can sort any problem out. Highly recommend them.

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Customer in Hertfordshire5.0 / 5

Harp Windows fitted two back doors, to replace old wooden, half glazed units. It was a pleasure to do business with them throughout. The installation team excelled themselves to be helpful.

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Andrew & Kath5.0 / 5

My wife and I used Harp windows to replace the windows in our house some years ago. They delivered on time and on budget exactly as quoted with a lovely team of people. The product (aluminium internally glazed) has held up really well over the last few years and when we extended we used them again. They matched the windows and installed in the same way, on time and budget while sourcing bifold doors for us as well. The team responded to our queries in a very fast and efficient way revising any quotes quickly for us to evaluate and ensuring we had the correct window layouts (bars and leading etc...) The new windows are of the same high quality as was the installation team. We have used a lot of contractors as part of the extension and had our original builder go bust. In an industry with many variables HARP and its team (particularly Gary Hays) are outstanding and we would not hesitate to recommend them.

Which? Trusted Traders
Customer in Hertfordshire5.0 / 5

Replaced 4 windows and fitted a new door to the rear of the garage. This was the second time I have used Harp. The first time they supplied a patio door and widow to a new rear extension. The work was done to the agreed budget but was delayed by the Corona virus lockdown. A revised date was agreed and kept to. The fitters were very courteous, considerate (keeping a social distance) and very clean. At the end of the job you could not tell that they had been, everything cleaned up neat and tidy. Very satisfied with product quality based on my previous experience. I would definitely recommend this company.

Which? Trusted Traders
Customer in Greater London5.0 / 5

Harp windows fitted new windows, front door & a porch on my parents house. All work was carried out to a high standard. They arrived on time & were courteous & professional. They advised of progress & went over & above to ensure there was minimal disruption. All areas were kept clean & tidy. They were truly outstanding. My parents are extremely happy with their new fittings & would definitely use Harp Windows again. We highly recommend & thank them very much.

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Customer in Greater London5.0 / 5

I had redone my house in 2016 with extension and Harp Windows have installed double glazed windows throughout the house together with Bi-fold doors for the living room. I do not recall if I left a review back then but the reason to do now are as follows: 1. All suppliers promise the earth n the stars when taking an order but lack afterwards in after-sales service. It has been now more than 3 years and on 2 occasions Harp representative have come to attend even a small problem without any hesitation and without any reminders. Gary has been the man behind it and would recommend him highly. 2. Unlike other Double Glazing Companies Harp never pushed for an order. They were straight forward and upright and defined clearly what they can do and what they can't. I personally like this approach and was very happy with the final result. 3. My experience with them is such that I would recommend them very highly without any drawbacks.

Which? Trusted Traders
Sam in Greater London5.0 / 5

Great Service and High Quality Bi Fold Doors Fitted. Harp Windows provided an excellent service from start to finish and we are very happy with the end result. Our new Bi-Fold doors were fitted on time by friendly, professional staff. We are very happy with both the fitting and the quality of our new the doors and will def. use Harp Windows for any future work.

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Customer in Hertfordshire5.0 / 5

I wanted to get Bi-Flold doors fitted and am so glad I used Harp Windows for this service. I was made to feel comfortable in the show room and was given clear explanations regarding my options - there was no pressure of influence given with my order. Harp Windows visited my house in conjunction with the builder carrying out the work to ensure all requirements were in place and understood so no issues would arise with the door opening and fitment. I was given clear timescales for ordering so knew what to expect and when which were met. The fitting team arrived with the door and were polite. They worked quickly, were clean and the overall result was excellent - the doors fit perfectly and they operate just as expected. I am really happy with the overall look and quality of the door.

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Ed in Greater London5.0 / 5

Harp windows replaced all our windows and doors and were very helpful from the start. We are very pleased with the service and get people knocking on our door all time asking who fitted our windows and front door.

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Alex in Hertfordshire5.0 / 5

What fantastic service I have received from the start of engaging with Harp until completion of the job. Everyone was an absolute pleasure to deal with and the windows look great - the left so little to sort out and cleaned up so nicely. I would highly recommend Harp to anyone!

Which? Trusted Traders
Customer in Hertfordshire0.0 / 5

The service from start to finish was impeccable. This included first contact, measuring service, install and final payment. An incredibly professional company and kept high standards throughout. Special mention must go to the window fitters who arrived on time, were extremely polite, worked quickly and efficiently and left it absolutely spotless. A minor error in communication along the line was that we added on two window boards which the fitters were unaware of. However they made a trip back to collect them and fit them on the final day. I would highly recommend Harp windows to friends and family.

Which? Trusted Traders
Customer in Essex4.3 / 5

The team from Harp did a great job . From providing all the info needed to comply with the landlord’s licensing requirements to installation . The windows look lovely and the guys did an amazing job with so little mess. Very pleased indeed . Given the windows industry suffers a bit in terms of reputation , it’s been a pleasure lovely to deal with knowledgeable, good people before and during the installation . Thank you - we are really pleased and wouldn’t hesitate to recommend .

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Customer in Hertfordshire5.0 / 5

The whole process was friendly and stress-free. The installation was done quickly and to a very high standard. I would use Harp again and thoroughly recommend them.

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Customer in Hertfordshire5.0 / 5

The Company was very professional from the showroom to completion of the job. The fitters were extremely courteous and carried out all works in a professional manner and left everything clean and tidy on completion. I would highly recommend Harp Windows.

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Tim in Hertfordshire5.0 / 5

All done on time in accordance with the quote. They cut down a window opening to put in an aluminium door with tall window beside, and removed the rubble etc. leaving some good re-usable spare bricks. Not too much dust etc. left, and everything ready for final finishing and decorating which I've done. Looks good, works well, wife and daughter happy! And, I think, a fair price. A straightforward no-nonsense local company I'm happy to recommend. Competent, friendly, and helpful.

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Credentials and associations

Named registry and membership evidence

1

Official or controlled checks carry the strongest weight here. Listed, missing, and ambiguous evidence stays visibly weaker than a verified pass.

Public evidence checks

Trust checks and red flags

Public evidence shown
Public review evidence4.9★ from 67 public reviewsCompanies HouseWhich? Trusted TradersFENSA
Sources

Every signal, traced to its origin

2 named sources

Review sources

Which? Trusted Traders

Official sources

Companies House
Public evidence checks

What's strong, and what to check yourself

Strong signals
Rating: 4.9★
Review volume: 67
Source diversity: 2 sources
Verification: Verified
1 verified credential
!Worth checking yourself
!Always confirm credentials and quotes with the trader directly before hiring.

Public evidence last checked May 2026

Good to know

Common questions about Harp Windows (Watford) Ltd

What do customers say about Harp Windows (Watford) Ltd?

Harp Windows (Watford) Ltd has 67 public reviews, averaging 4.9 out of 5, gathered across 2 independent sources. You can read the individual reviews and where each came from in the reviews section above.

How do I know Harp Windows (Watford) Ltd's reviews are genuine?

Harp Windows (Watford) Ltd's 67 public reviews are gathered and cross-checked across 2 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 Harp Windows (Watford) Ltd qualified and accredited?

We hold 1 independently sourced credential for Harp Windows (Watford) Ltd, including FENSA. 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.

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