Window / door fitterWatford★★★★★4.9· 68 reviews · 1 independent public source
✓
Credentials & registries
2 credentials shown
Trust Score
58out of 100
Good record, gaps to check
✓Rated 4.9 from 68 reviews
✓2 credentials shown
Newest review May 2025
How this score is worked out
Rating4.9 / 5
Review volume68
Independent sources1 independent public source
Credentials2 credentials shown
How this score is made up
What customers say36.5 of 60
Independent checks13.4 of 30
Track record8.2 of 10
See the independent checks
Licences and credentials4.1 of 8.3
Ways to reach them8.3 of 8.3
Reviewed on more than one site0 of 6.2
Registered company details0 of 4.1
Photos of their work1 of 2.1
Industry recognition0 of 1
Missing evidence lowers the score because we can't check it. It doesn't mean it doesn't exist. Claiming a profile never changes the score. Evidence context, not a guarantee of workmanship.
These reviews are published independently on the named public source below, not testimonials this business chose to show. We bring them together and link each one back to where it appeared, so you can open the source and read it yourself.
4.9out of 5
68 reviews in public evidenceReviewed on public review sources since 2019Most recent review
Customers often mention
Friendly & politeMentioned in 56% of reviews we've read
ProfessionalMentioned in 32% of reviews we've read
PunctualMentioned in 32% of reviews we've read
Tidy & cleanMentioned in 32% of reviews we've read
Where these reviews are published
Which? Trusted Traders68 reviews · 4.9 avg
Detailed reviews
These are the individual reviews we hold for Harp Windows (Watford) Ltd, including the highlights above. The 68 headline total is the review volume reported across public review sources.
Customer in Hertfordshire
Customer recommends this business
Window replacement
First class service from initial contact to installation. Fitters Bogdan and Andrew were excellent with attention to every detail. Very pleased with the end result. Would definitely recommend Harp Windows.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Greater London
Customer recommends this business
Great service. A pleasure to do business with this firm.
From the time of our first contact (with Ewa) through our interactions with Gary, John and Ryan we were pleased with their service. They replaced a patio door. The installers, Bogdan and Tom were pleasant, quick and efficient. A minor snagging issue was fixed promptly. Many thanks to Harp Windows. No hesitation in recommending them to other Which? members.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
4 / 5
Customer in Hertfordshire
Customer recommends this business
Great work done very quicly
Tom and Bogdan installed 6 windows in a two bedroomed flat in less than a day , great work and very friendly
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Greater London
Customer recommends this business
Excellent service and good quality
Writing this review 3 years after our windows were installed and still very happy with the standard uPVC windows on our bay windows. Delay in writing review as I wanted to wait a while in case of any snags (there weren't any) and also because I just haven't had a chance to write the credit that Harp Windows deserves. I absolutely recommend Harp Windows. I can't speak highly enough of Amy, John and the installation team. Excellent communication and they patiently answered all of the questions. They arrived on time for the quotation appointment and installation - they are very experienced and knowledgeable. Harp Windows removed aluminium windows and the remnants of the bay window bits and replaced with uPVC. They exceeded expectations as they replaced the window ledge with wood and not pvc as many others quoted for. Since installation, condensation black marks on walls is a thing of the past. I had contacted quite a few companies and none of them gave me the assurance or level of confidence that Harp Windows did. And they were reasonably priced for the quality of workmanship and materials. Thank you Harp Windows. I'd use them again.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Double Glazing excellent in all respects.
Very impressive service from initial contact, through quotation, survey, execution and completion. Excellent workmanship, work-rate, attention to detail, co-operation, tidiness & execution by Robert and Andrew. The quality of window materials is excellent.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Read the other 15 detailed reviews on this pageShow fewer reviews
Customer in Hertfordshire
Customer recommends this business
Excellent quality service
Harp were great from start to finish. High professionalism and very high quality of work. We are very pleased with the end result and would definitely recommend
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Tim in Hertfordshire
Customer recommends this business
New side door and window
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
New windows and French doors
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
efficient process with excellent workmanship
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
4 / 5
Quality
5 / 5
Value
4 / 5
Customer in Essex
Customer recommends this business
Great work , great price , great service! Thanks
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 .
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Outstanding service
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Alex in Hertfordshire
Customer recommends this business
Great work - very reliable
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!
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Ed in Greater London
Customer recommends this business
Professional service
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Sam in Greater London
Customer recommends this business
Great Service & Highly recommend the company
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Bi-Fold doors - purchase & installation
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Greater London
Customer recommends this business
Complete House Double Glazing Windows + Bi-fold Doors
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Greater London
Customer recommends this business
Outstanding service
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Courteous, efficient and tidy
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Andrew & Kath
Customer recommends this business
Excellent Company and customer ethos
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Customer in Hertfordshire
Customer recommends this business
Two back doors: kitchen and garage
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.
Work completed:
Scores listed by Which? Trusted Traders
Customer Service
5 / 5
Quality
5 / 5
Value
5 / 5
Local context
Rated 4.9, above the local average for window / door fitters in Watford
Across 21 window / door fitters in Watford, the typical rating is 4.8 out of 5. We compare against the same businesses a homeowner would find searching for this trade locally.
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From customer reviews
What customers consistently say
Recurring themes from 25 customer reviews on Which? Trusted Traders.
Respectful and tidy in your home: “left everything clean and tidy on completion.” · Which? Trusted Traders, 2 Apr 2023
Reliable and punctualQuoted from 3 reviews
“They arrived on time for the quotation appointment and installation” · Which? Trusted Traders, 30 Dec 2024
“window fitters who arrived on time” · Which? Trusted Traders, 16 Nov 2021
“Fitter was on time” · Which? Trusted Traders, 29 Mar 2019
Credentials and associations
Credentials and memberships
2
These credentials and memberships are attributed to named public sources. Check the source before relying on them.
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.
ALI crittal replacement slim anthracite ali Sarrat barn conversion complete1.jpg
Ultimate Rose box sash windows and English Door Co Bamburgh front door.
Evolution Storm timber replacement windows in agate grey. Ovolo putty Georgian bars.
Stunning Bucks Hill extension, Origin Bifold doors + Evolution Flush windows & doors.
Tring. Anthracite aluminium Origin 4-panel bifold with demi lune top light.
Chorleywood. Black Origin bifolds + Evolution Flush windows.
Bushey. Unusual mix of Universal 3-part sash window to upstairs and Rehau 3-sided bay below.
From Which? Trusted Traders
Opening hours
The hours this business publishes online, handy for knowing when to call. Confirm before you set off.
Monday–Thursday
9:30am–5pm
Friday
9:30am–4:30pm
Saturday
10am–2:30pm
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Sources
Where this information comes from
2 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.
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.
Services they list
Conservatory maintenanceConservatory glass heat reduction filmConservatory repairsHardwood conservatories and orangeriesBi-fold doorsPatio doorsFire doorsFrench doorsOrangeriesComposite doorsUPVC doorsFront door
Listed on public sources or the business's own website; check directly that they cover your job before you book.
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.
How long they've really been tradingThey state they've been established since 1989, but the earliest independent source we can find is 2019. Worth asking them about the gap.
They say, established1989First public review2019
Your own checks
What to check before you hire
Worth checking yourself
Their public evidence comes from a single source. Look them up on another site before deciding.
✓
Be wary of high-pressure 'today-only' discounts and a salesperson who won't leave. A reputable window or door firm gives you a written, itemised quote you can take away and compare against others.
✓
Never pay the full price up front; a modest deposit with the balance on completion is normal. Ask what deposit protection or insurance-backed guarantee you get if the firm stops trading before fitting.
✓
Get the specification in writing (frame material, the glazing units and their energy rating, and any trickle vents) so you can check you got what you paid for.
Want an extra legitimacy check? Run the Cowboy Checker on Harp Windows (Watford) Ltd before you contact them.
Is Harp Windows (Watford) Ltd a legitimate business?
Harp Windows (Watford) Ltd has 68 independent public reviews, rated 4.9 out of 5. 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 Harp Windows (Watford) Ltd?
Harp Windows (Watford) Ltd has 68 public reviews, averaging 4.9 out of 5. 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 68 public reviews come from a named public review source, and MyTrustedTraders links every one back to where it was published, so you can open the source and read them yourself rather than trusting a single curated 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 2 independently sourced credentials for Harp Windows (Watford) Ltd, 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.
Does Harp Windows (Watford) Ltd guarantee their work?
They state on their own website that insurance backed warranties. This is the business's own statement on their website, not something we have independently checked. Get the terms in writing before you agree to the job.
What does Harp Windows (Watford) Ltd specialise in?
Harp Windows (Watford) Ltd lists specialist services including Conservatory maintenance, Conservatory glass heat reduction film, Conservatory repairs, Hardwood conservatories and orangeries, Bi-fold doors, Patio doors. If your job is one of these, look for it in their listed services or ask them to confirm for your project.
How long has Harp Windows (Watford) Ltd been trading?
Harp Windows (Watford) Ltd has been reviewed on public sources since 2019.
These describe public evidence MyTrustedTraders held at the stated dates. They are not independent awards, they cannot be bought, and they do not change this business's Trust Score or search position. How milestones are measured