The quick way to find a local Single / Double Glazing specialist in Welwyn

SLF LOCKSMITH AND CARPENTRY LTD

Single / Double Glazing

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Hi all, I have been a locksmith/carpenter for 25 years and I am NCFE qualified and fully CRB checked. I can solve all your lock, door, window issues and can open cars and safes. I have covered thousands of jobs in my work and I will solve all your problems in a clean and friendly manner. Locks picked, locks changed to insurance standard, Doors supplied and fitted, windows issues solved. UPVC expert. My son also has his own loft conversion company with his uncle and we can complete any Bespoke Carpentry & Conversions work.

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Reviewed by maurice on 29/6/2026

Gkouli Construction Company

Single / Double Glazing

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We are a construction company dealing in all aspects of building work extensions and home improvements with over 20 years experience. We work to a high standard and work to timelines for our clients. We will also work to Covid government guidelines when working at your property.

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Reviewed by Gareth on 29/11/2021

Did a fabulous job on my back yard concrete patio which was crumbling in places and needed levelling. Also suggested adding another step to a rather steep step in place already which made perfect sense and he did a great job with that too. Took 1 day and sent photos of the site after work. Very impressed and very happy with the outcome. I recommend this company and will be using them again on other jobs in the future.

Roberts 21st Century Designs Ltd

Single / Double Glazing

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Welcome, Our company offers a complete service starting with first few sketches passing through building regulation approvals and all the steps till those finishing touches ensuring that our customers are fully satisfied.

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Reviewed by Syed on 17/12/2015

There isn’t enough space on here to describe how happy I am and stress free Rob and his team made the process. I had a major extension to the rear and side of the home which meant I wasn't able to use the bottom area of my home at all. Rob and his team took care of everything and also provided so much extra help all the time any time and keeping up with the consistent service is truly unmatchable. I’m very happy with the work, the finishing and everything else. Choose Rob and his team and you can’t go wrong

Costa Boyer Ltd.

Single / Double Glazing

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Costa Boyer Ltd provides specialist for complete building solutions: house extension/ loft conversion/ replacement windows/ doors/ shops front/ home improvements/ kitchen/ tanking slurry solutions/ garage conversion/ porch/ canopy/conservatory / garden shed/ wooden decking/ parquet/ painted house/ Venetian stucco/ water leak/ 30 years experience building site/ all team have CSCS card/ NVQ Level 2/ NVQ Level 3 supervision/ GQA Qualification Ltd Certificate of achievement in theory of SCHUCO/ GQA Qualification Ltd Certificate of achievement in SCHUCO Curtain Wall/ GQA Level 3 Certificate in glass related operation/ GQA Level 3 NVQ Diploma in Fenestration Installation/ IOSH Working safely a course approved and validated by the Institution of Occupational Safety and Health/ Gold card Constructions Qualifications CSCS / Quality Management & Control accreditation by Mace Business School Limited/ Level 6 NVQ/ SMSTS and new one... Covid-19 Essential: Infection Prevention and PPE

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Reviewed by Gareth on 30/6/2021

Costa was excellent. Very friendly, efficient and carried out the work to to a high standard in the agreed timeframe and at the agreed price, despite some unexpected problems along the way. Would happily recommend him.

AHCM PROPERTY

Single / Double Glazing

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I have 20 years Main Contracting experience covering all aspects of the construction industry; from design and planning to the full delivery of new build dwellings, extensions, refurbishments, period properties, conservation works, landscaping and utilities. Utilising this experience, I now work within the maintenance sector and on smaller projects offering a more personal service whilst still providing consultant/ construction management services for the larger schemes.

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Reviewed by Peter on 30/8/2025

Victorious Glazing Ltd

Single / Double Glazing

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Victoriouss Glazing Ltd is a professional double glazing company specialising in the supply and installation of high-quality windows and doors. We are FENSA approved, ensuring all work is fully compliant with UK building regulations and comes with the appropriate certification for your peace of mind. Our services include: • uPVC, aluminium, and composite windows & doors • Repairs and replacements • Energy-efficient glazing solutions • Full installation with clean and reliable workmanship We pride ourselves on competitive pricing, attention to detail, and excellent customer service. Whether it’s a small repair or a full property upgrade, we deliver high-quality results every time. Free, no-obligation quotes available.

Edgars Constructions Ltd

Single / Double Glazing

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Well established family run building company based in London,we have built a strong relationships with well known building societies across the London due to our quality and trustworthy service High quality levels of work in major building projects,we specialise in planning and design,project management and general building services

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Reviewed by Zuzie on 17/3/2026

CJP Builders

Single / Double Glazing

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CJP Builders is a general builders company that specialises in high-quality brickwork, whilst that is our forte we also offer a full range of building services catered to what you need from us. With strong attention to detail, alongside the experience and expertise were always looking to expand and grow taking on any work or projects of all sizes We aim to deliver reliable, efficient and everlasting results, whether it’s new builds, extensions, renovations or repairs, we here at CJP are committed to quality workmanship and customer satisfaction every step of the way

URBAN MODERN HOMES LTD

Single / Double Glazing

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We are a team of highly skilled individuals, with a great sense of professionalism and integrity. Our purpose is to deliver the transition from our customer's vision to reality and strive to bring satisfaction and joy with the results of our work. We aim to offer the best possible service while building trust with our clients. Having over a decade experience in the building industry, gives us the possibility to be quick, flexible and efficient.

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Reviewed by Zillionz on 2/5/2024

John Construction

Single / Double Glazing

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general building services

JAC Sealants

Single / Double Glazing

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Professional sealant applicator (mastic man) Over 10 years experience Work completed to high standard

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Reviewed by Kaj on 27/8/2025

Cleanlines Paving

Single / Double Glazing

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Transforming spaces into stunning havens, Clean Lines Paving is your go-to partner for all things construction and landscaping in North East London, Enfield, and beyond. With a rich legacy spanning over 20 years, our craftsmanship speaks volumes, whether it's crafting bespoke patios, driveways, fencing, or foundations. But we're more than just surfaces; we're your trusted allies in home transformation. From seamless garage and kitchen conversions to elegant one-story extensions and inviting porches, we bring your vision to life with precision and flair. At Clean Lines Paving, we understand that every project is unique, just like every home. That's why we offer a diverse range of designs to perfectly complement your space, ensuring that every inch reflects your style and personality. When it comes to property maintenance and repairs, trust in our expertise to keep your investment in pristine condition for years to come.

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Reviewed by Mohamed on 2/9/2024

Very pleasant, understanding and efficient. Quote as would be expected for the job. I’m very happy with this company.

KP GENERAL BUILDERS

Single / Double Glazing

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General Building ,Refurbishment,renovation Activities.,Established 10 years ago, experience on the domain for 15 years .

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Reviewed by Brenton on 21/1/2026

IMPRESS EUROPE LTD

Single / Double Glazing

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Impress Europe Ltd is a full service construction company offering comprehensive solutions for residential, commercial and industrial projects. From design and planning to building and finishing, we handle everything - including new builds, extensions, loft conversions, renovations, landscaping and custom projects. Our team of skilled professionals are committed to delivering quality, safety and excellence in every job. We pride ourselves on reliability, clear communication and building long lasting relationships with our clients. Choose Impress Europe for all your construction needs - one company, every solution.

J MCMAHON LIMITED

Single / Double Glazing

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Bedfordshire based carpentry and property improvements company . offering carpentry internal and external , as well as having a strong diverse team of different trades operating within the company , all aspects of building work taken on board and a professional job from start to finish .

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Reviewed by Christopher on 27/3/2026

Very unprofessional Postponed the agreed date and then ignored all messages Avoid!

DCK

Single / Double Glazing

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I've been in the building trade now for around 17 years, specialising in carpentery and kitchen fitting but carry out most aspects of building work too.

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Reviewed by Julian on 24/12/2023

Dan and his team were outstanding. Extremely personable, professional and straight forward. They arrived when they said they would arrive, did a great job creating the roof truss structure and were competitive on price. I would strongly recommend them for anyone looking for a carpenter.

Conserv-A-Tech

Single / Double Glazing

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We are a specialist local company dedicated in the construction of Conservatories, Orangeries, Glazed solid tiled roof extensions, Garage Conversions, Energy rated Windows & Doors, Bi-folding Doors, Composite Doors.

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Reviewed by Jeffery on 3/1/2015

Would recommend to use them

JS7 Service LTD

Single / Double Glazing

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I am an experienced builder providing a wide range of interior and exterior construction services. I specialise in all aspects of building work, including bricklaying, plastering, painting and decorating, paving, flooring, plumbing, and fencing. I also carry out complete projects such as driveways, kitchens, bathrooms, garage builds, extensions, and loft conversions. From small repairs to full renovations, I handle every job with care and attention to detail. I take pride in delivering high-quality, strong, and reliable work, ensuring every project is completed to a professional standard. I focus on good workmanship, safety, and customer satisfaction at all times. I am hardworking, trustworthy, and able to work independently or as part of a team. No job is too big or small, and I always aim to finish on time and within budget.

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Reviewed by Noel on 8/5/2026

Very happy with the garden wall repair. Neat work. Good workers.