Endorsed by Which?

Conserv-a-tech

4.8

107 Reviews

Opening Hours
Today - –
  • Monday –
  • Tuesday –
  • Wednesday –
  • Thursday –
  • Friday –
  • Saturday - Closed
  • Sunday - Closed

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About

Owned & managed by its Director Eric Knappett, with the Sales & Design managed by Allan Wilding, both Eric & Allan have over 60 years of combined experience & a wealth of knowledge in this industry. Conserv-A-Tech is your market leader in glazed extensions, conservatories, orangeries, energy-rated windows, garage conversions, bi-folding doors in Stevenage. being Independently owned & a flourishing business,with an enviable reputation, Conserv-A-Tech offer's the highest quality products of the industry, much better project management, installation, and customer service,& all our staff are Employed.
Our customers are real people...not just a contract number!
As the leading choice for conservatories, Glazed Extensions, Windows & Doors based in Stevenage, we install throughout Hertfordshire, Bedfordshire, Cambridgeshire, Buckinghamshire.
Call Eric, Kim or Allan today, and start your journey with Conservatech.

What we do

  • Builders

    • Conservatories
    • Garage conversions
  • Double glazing

    • Double glazing installation
  • Doors

    • Bi-fold doors
    • Patio doors
  • More Services

    • orangeries
    • solid tiled roof glazed extensions
    • bi-fold door

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

4.8
107 reviews
Customer Service
4.8
Quality
4.9
Value
4.8
Sort by
Great work, fast and efficient
Customer Service
Quality
Value
After having Conservatech install my dream conservatory, I had no hesitation in contacting them again (2 years ago) to install a porch/lean to and bedroom window for my elderly mother. This year they have installed a new front door and bathroom window for her. I honestly would not use anyone else now. From start to finish the guys, and Kim, are a pleasure to deal with. Knowing that my mother is also so comfortable with them is just fantastic. Not only in their pricing, quality, communication and their skilled workmanship but also their personable nature's, they are just the best, I cannot praise them enough.
Customer in Hertfordshire Posted on 24/08/2026 , work completed 20/08/2026
Strong recommendation/ review for double glazing work
Customer Service
Quality
Value
Conservatech replaced all my existing old double glazing (been in for 30+ years) and also installed a brand new door with associated fittings into what used to be the back door alcove. From initial request for quote with Allan, through to site surveys and installation were completed and met / exceeded my expectations. I was particularly impressed with the 3 gentlemen who did the installation. They were timely in meeting the schedule they set in place and the quality of installation is all I hoped it would be. Being biodiverse I was heavily concerned about having 3 strangers in my house - but I was shown respect and professionalism throughout the installation process. I did not once find I was concerned about how they managed their time or what they were doing around my house. All installations (as quoted above) were completed to a high quality and clean up process was completed daily. And even though they were working through the hottest days we’ve experienced this year, it did not slow down their drive to meet agreed installation timescales. In addition to the excellent work I am also very happy with the quality of double glazing fitted, from the composite doors to installed windows, everything works smoothly and feels robust to last another 30+ years. I would / am strongly recommending this company to anybody considering installation of any double glazing requirements they may have.
Customer in Hertfordshire Posted on 14/06/2026 , work completed 01/06/2026
Never a disappointment!
Customer Service
Quality
Value
This is my second job using Conservatech first was a conservatory which was a great success so was a no brainer to use them to install my black ally double doors . Site visit with Eric and the team set this job to a seamless and pleasurable day to complete. Leon and Stuart from start to finish were professional and as always left the job tidy and looking amazing so happy I chose them other companies do not take such care with their work and looking after the client I cannot recommend more highly see you again I am sure !!!!
Customer in Hertfordshire Posted on 11/06/2026 , work completed 08/06/2026
- replacement windows and door -a job well done
Customer Service
Quality
Value
Eric's team arrived promptly on schedule, they worked efficiently, tidily, & were most competent and overcame problems with confidence. The house was left clean when they finished each evening. The team had a good friendly, helpful, attitude and the job was completed to my complete satisfaction.
Customer in Hertfordshire Posted on 29/05/2026 , work completed 22/05/2026
Amazing transformation
Customer Service
Quality
Value
In March 25 we had our old polycarbonate conservatory completely transformed,we cannot speak more highly of the excellent work carried out by Leon and his crew,they were all very considerate,and respectful . This also includes the plasterer, and-electrician.The work was started on time, finished on time and the end result was a great room that we can now use all year round. We had a solid roof with glass panels,new doors,new windows in all a great transformation In March 26 we had new widows fitted in the house and without hesitation we turned to conserve-a-tech. Once again a brilliant job completed in 2days . Again delighted Would highly recommend
Customer in Hertfordshire Posted on 11/05/2026 , work completed 30/04/2026
Conservatory Adaptation
Customer Service
Quality
Value
We used Conservatech to convert our conservatory into a liveable space (not too hot in the summer and cold in the winter) and to fit new window. They not only were the only company that offered exactly what we wanted, but Allan was really thorough in talking through plans and ready to answer any questions we had. They were helpful and worked around our other building work we were having done. The payment schedule and process was really clear. The work started and the builders turned up when they were meant to, worked all day and tried to limit the disturbance to us as a family as much as possible. They were considerate of my children's additional needs and respectful of our property at all times. They clearly communicated what they were doing, and despite saying they preferred my husband's cups of tea we were really happy with the work they completed. There were a few issues (e.g. with their plumber's availability) but they worked with me to find a solution. They also were available to answer the phone if I had any queries. We were very happy with the work of external trades (plasterer and electrician). Phil, the electrician was able to help with other building work we were having done. This allowed consistency and we were really happy with the work he completed. He was extremely accommodating and made sure we got what we wanted. The work was completed 4 months ago and we are still extremely happy with the space. It has transformed our living space.
Customer in Hertfordshire Posted on 26/04/2026 , work completed 01/12/2025
Replacement of Conservatory
Customer Service
Quality
Value
Everything about our experience with this company was positive. The quote was thorough and competitive. The work was undertaken in the expected timescale and to an excellent standard. The whole team were very professional and a pleasure to have in our home. We are delighted with our new conservatory, it is just as promised.
Customer in Hertfordshire Posted on 14/01/2026 , work completed 05/11/2025
Conservatory transformation
Customer Service
Quality
Value
Had an old polycarbonate roof and pvc french doors conservatory replaced with a warm deck solid roof with central lantern, and bifold doors. They also plaster boarded and plastered the walls, replaced the floor, new electrics, and fitted some internal doors that I supplied. Really happy with the result! It was completed over a month ago and we now spend most of our time in this room because of how light and pleasant it is. We explored different options of roof and door style with Alan, and it took a few iterations to get to the final design but I'm very confident we made the right choice. Alan's advice and willingness to help was always appreciated. The fitters did a great job, stayed fairly late most days to get bits done and tidy up. They were really accommodating when it came to fitting the internal doors I supplied (internal bifold doors, and an external fire door into the garage). It became clear the doors were not going to go in quite how I originally imagined, but Leon came up with a solution, talked me through it, and the result is better than what I originally wanted. I was really impressed with Leon's can-do attitude and determination to get the best result. They did have some issues with several glass panels from their supplier that had scratches or were wrong, but they already had replacements on order before I'd spotted them. That kind of thing goes a long way in building trust. Overall top job, completed to the original agreed price. Definitely recommend.
Customer in Hertfordshire Posted on 01/01/2026 , work completed 03/12/2025
From Start to Finish: Seamless Garage Conversion Experience
Customer Service
Quality
Value
We used Conserv-A-Tech for our garage conversion, and it was the best decision we made. They came highly recommended by family, and we can see why. From the first call with Alan to the in-person discussions, communication was simple, polite, and professional. The flexibility to make small changes to the scope, even while the team was on-site, was a real bonus, nothing was too much trouble. Eric, who scoped the project and took measurements, was extremely knowledgeable and had a clear vision. What made the process stress-free was Eric’s full project management, he organised everything, including plastering and electrics, so we didn’t need to source trades ourselves. His contacts are excellent, and the quality of work reflects that. Special mention to Phil (HJP Electrical) and Charlie the plasterer. The entire team was polite, hardworking, and clearly took pride in their work. Each day they arrived knowing exactly what needed to be done, and their attention to detail was outstanding. The site was left spotless every evening, and all rubbish was removed. The project was completed within the agreed timeframe, with no hidden costs thanks to accurate planning from the start. Eric was always just a WhatsApp message away and responded promptly and proactively. We’re delighted with the final finish and will definitely use Conserv-A-Tech again for future projects.
Customer in Hertfordshire Posted on 11/12/2025 , work completed 31/10/2025
Outstanding service, real people who care, and a door that’s absolutely perfect!
Customer Service
Quality
Value
Outstanding service, real people who care, and a door that’s absolutely perfect! These days, most door installers expect you to use an online design tool — you create your own door, submit it, get a quote, and hope for the best six weeks later. I’m quite IT-savvy and like to be independent, but when it comes to something as important as a front door, I needed to be 100% sure I was getting exactly what I wanted, with proper advice from a professional who actually cares. I requested around seven quotes and did seven designs — yet with most companies I was only about 60% sure how the final door would look and function, which isn’t good enough for me. Only two installers were willing to visit in person, and Conservatech stood out immediately. Allan was incredibly thorough, walking me through every single detail — from style to security — and his knowledge and patience were so reassuring. After that visit, I knew Conservatech was the right choice. Eric, the owner, then came to do the final measurements himself, making sure everything would fit perfectly. And when installation day came, Leon and Stewart did a fantastic job — they were professional, kind, and efficient, fitting the door beautifully despite heavy snow and rain - all in record time! Price-wise, Conservatech are very competitive, but their level of customer service and care puts them miles ahead of the competition. I couldn’t recommend them more highly.
Customer in Hertfordshire Posted on 27/11/2025 , work completed 19/11/2025