Find an Extension Builder in Hertfordshire

Find a local extension builder near you. We have 9,424 trusted and reviewed extension builders in Hertfordshire to choose from, based on 4,135 reviews.





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Extension Builders in Hertfordshire

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  • 1-20 of 9,424 extension builders

    We are a reliable Hertford-based building and property maintenance company providing high-quality home improvements, repairs and refurbishment services throughout Hertfordshire and surrounding areas. With strong experience working on residential and...

    Latest Builder Review

    "Harvey was very professional and completed the job in one day despite it being a 2 man job. His partner was unable to work due to illness. The plaster work to the cieling is faultless. Harvey moved the furniture, provided some..."

    Reviewed by on
    Based in SG14 2FF, Hertford
    Extension Builder covering Hertfordshire
    Member since Nov 2025
    ID Checked

    Kings Maintenance • Over 20 year’s experience • Brickwork and Heritage repairs • Ground works • Internal and External repairs and Construction • Kitchen instillations • Office fit outs • Skyvac gutter cleaning • Free quotations and advise

    Latest Structural Steelwork Review

    "This was only a small job but having already been let down by two other tradespeople dealing with Adam was a breath of fresh air. Understood what I wanted immediately and provided a quick, detailed quote. He followed this up by co..."

    Reviewed by on
    Based in AL7 3XF, Welwyn Garden City
    Extension Builder covering Hertfordshire
    Member since Dec 2024
    Public liability insurance

    Small building contractor, patios, driveways, landscaping, garage and shed bases, painting and decorating. Based in Herts. Fully insured.

    Latest Concrete Base Review

    "Polite, respectful, experienced and skilful. Great tradespeople who I will use in the future for many varied tasks and projects."

    Reviewed by on
    Based in AL1 5ST, Saint Albans
    Extension Builder covering Hertfordshire
    Member since Jul 2025
    ID Checked

    We are a team of experienced tradespeople, we carry out all aspects of building work Listed below are types of work we carry Brickwork Carpentry Decorating Ground work Gutters Landscaping Roofing Plastering Property maintenance Just to na...

    Latest General Maintenance Review

    "Job completed in a day, removal of bricks to install a lintel above patio door and bricks replaces once lintel had been installed. Professional done I would recommend using this team."

    Reviewed by on
    Based in HP14 3XB, High Wycombe
    Extension Builder covering Hertfordshire
    Member since Aug 2022
    ID Checked

    We are dedicated Contractors and looking for local work to undertake project management and construction services. We are a family business and dedicate our time and energy to the delivery of high quality work. We undertake individual maintenance wor...

    Latest Builder Review

    "James and his company contributed and delivered a complete refurbishment of our home in North London. He and his team were reliable, cautious in what they were doing, creative with a strong focus on the engineering requirements of..."

    Reviewed by on
    Based in N6 5JT, London
    Extension Builder covering Hertfordshire
    Member since Dec 2025
    ID Checked

    Are you looking to transform your indoor/outdoor space??? K&L Build Design and Maintenance is a trusted building and landscaping company committed to delivering exceptional workmanship and reliable service across every project. Specialising in b...

    Latest Chimney Building / Repair Review

    "Good guys, came in time, done the job, no fuss, left no sign behind after the job. Would recommend."

    Reviewed by on
    Based in WD25 9EU, Watford
    Extension Builder covering Hertfordshire
    Member since Nov 2025
    ID Checked

    Im A professional builder combines technical skill with strong organization and leadership. You interpret blueprints accurately, coordinate workers and subcontractors, and maintain strict quality standards. You use modern tools and proven methods to...

    Latest Builder Review

    "Highly recommend, work was done to a high standard and met our expectations, very clean and organised."

    Reviewed by on
    Based in HA3 0QH, Wembley
    Extension Builder covering Hertfordshire
    Member since Nov 2025
    ID Checked

    NLK Group, based in London, provides bespoke services in carpentry installation, custom-made wardrobes and cabinets, house refurbishments, and various construction projects. Our offerings include: • Kitchen fittings • Fitted wardrobes • Painting...

    Latest Wooden Doors - External Review

    "Naim did a fantastic job with replacing our external doors- front and rear. Communication was great and we are happy with the results."

    Reviewed by on
    Based in WD25 0GD, Watford
    Extension Builder covering Hertfordshire
    Member since Nov 2016
    ID Checked

    A family business committed to quality, value and client satisfaction in every project. From little kitchen to big extensions

    Latest Garage Conversion Review

    "Great Price , great communication and completed job to high spec , very good team with him"

    Reviewed by on
    Based in HA7 1FP, Stanmore
    Extension Builder covering Hertfordshire
    Member since Jan 2020
    ID Checked

    Professional Work, Quality You Can Trust We deliver top-quality workmanship at reasonable prices, whether your project is big or small. Our team is reliable, experienced, and ready to handle any job, offering fair pricing for both customers and trade...

    Latest Plaster Skimming Review

    "Super quick and efficient"

    Reviewed by on
    Based in HA9 8SN, Wembley
    Extension Builder covering Hertfordshire
    Member since Oct 2025
    ID Checked

    i’ve been on the business for 25 years I do all types of building work, internal and external, Very high standards work, House renovation, extension, loft conversion, and new built.

    Latest Garage Conversion Review

    "Alfred and his crew were professional, flexible and found cost-effective solutions. Highly recommended"

    Reviewed by on
    Based in N13 6HJ, London
    Extension Builder covering Hertfordshire
    Member since Mar 2024
    ID Checked

    2Rok cons is a dynamic and experienced team, committed to providing excellence in general building and constructions, lateral thinking and innovation solutions to our clients. With a portfolio covering a wide range of construction projects, we are pr...

    Latest Builder Review

    "2Rok cons ltd has just finished creating our dream Kitchen. From our first meeting to finishing the project, they listened to what we wanted and gave us design and material guidance for our kitchen extension. We are very fussy wit..."

    Reviewed by on
    Based in WD7 7LW, Radlett
    Extension Builder covering Hertfordshire
    Member since Nov 2023
    ID Checked

    Independent sole trader. Small builds - patios, gardens, sheds, summerhouses, general tidy-ups, brickwork and general handyman work. Reasonable and fair pricing. References and photos of past work completed available upon request.

    Latest Wooden Decking Review

    "⭐️⭐️⭐️⭐️⭐️ We had an excellent experience working with Joe. He came over to give us a quote and carefully walked us through options that suited a low, mid, and slightly higher budget—which showed how transparent and considera..."

    Reviewed by on
    Based in SG3 6DU, Knebworth
    Extension Builder covering Hertfordshire
    Member since Mar 2025
    ID Checked

    Welcome to Edward Construction, your trusted driveway contractors based in the heart of South Hornchurch. We proudly serve the vibrant community of Havering, London, with our expert driveway services. Our team is dedicated to transforming your outdoo...

    Latest Floor Tiling Review

    "Conducted the job, quickly and thoroughly and to expectation. Kept informed through every step of the way. Would recommend for future work."

    Reviewed by on
    Based in AL10 9GS, Hatfield
    Extension Builder covering Hertfordshire
    Member since Feb 2025
    ID Checked

    20 years ago we started a handyman service in and around Welwyn Garden City , this grew into setting up a building company as the work and size of the jobs grew with all the happy customers LOCAL BUILDER 15 YEARS QUALITY WORK WITH LOTS OF RECOMENDA...

    Based in AL7 3UW, Welwyn Garden City
    Extension Builder covering Hertfordshire
    Member since Jul 2023
    ID Checked

    Your local building firm with over 10 years experience

    Based in AL6 9JG, Welwyn
    Extension Builder covering Hertfordshire
    Member since Mar 2024

    Efjprojects.com Is a family run Building Company. They delivery high standards and beyond. Covering all aspects of Building works, Property development and Landscape to create your perfect outdoor space.

    Based in AL8 7XE, Lemsford
    Extension Builder covering Hertfordshire
    Member since Apr 2024

    JCU who are we? We are a company that started as a dream by the director Joe Abbott. To build a better construction and plant hire image and take away the stress away from building your future. We own various plant that will help you drive costs dow...

    Based in AL6 9SU, Welwyn
    Extension Builder covering Hertfordshire
    Member since Jan 2023
    ID Checked

    After almost 20 years in supply of materials to the Trade, we decided to put our knowledge into practice and deliver high quality, reliable and honest workmanship, utilising a vast database of experienced and highly motivated tradesmen. We have va...

    Based in SG3 6JS, Woolmer Green
    Extension Builder covering Hertfordshire
    Member since Aug 2024
    ID Checked

    Hi, I am a self-employed builder with 25 years of experience in the building trade. I am reliable, professional, and take pride in delivering high-quality workmanship on every project. Fully insured with public liability coverage, I hold multiple qua...

    Based in AL7 3SY, Welwyn Garden City
    Extension Builder covering Hertfordshire
    Member since Nov 2025
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    Our Reviews

    All reviews are submitted by homeowners who have had work completed as part of using our service. Whilst every effort is made to verify and check reviews, we ask all homeowners to conduct their own research and follow our Homeowner Checklist before hiring.

    To understand more about our reviews process, please visit our Reviews Policy.

    Find Extension Builders Near You

    Trusted Extension Builders in other locations

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    Recently posted Extension Builders jobs

    Join over 1,000,000 happy homeowners who have posted their job on MyJobQuote.

    Job posted in Beckton

    To extend current kitchen extension

    Job posted in Potters Bar

    Need a 12x5.5m ground floor extension she’ll only which I have planning for we are still waiting for first floor to be approved on second application...

    Job posted in Bromley

    Integrate garage into habitable living space and in front of infill extension in 3 floors. You can find all documents in here: https://drive.google.co...

    Job posted in Fulham

    I have recently had planning permission approved for a ground floor extension to my flat in Fulham. I am only looking to have the 'shell' of the exte...

    Job posted in Luton

    we are looking at extending above single loft to give another bedroom with en-suite

    Job posted in Beckton

    To extend current kitchen extension

    Job posted in Potters Bar

    Need a 12x5.5m ground floor extension she’ll only which I have planning for we are still waiting for first floor to be approved on second application...

    Job posted in Bromley

    Integrate garage into habitable living space and in front of infill extension in 3 floors. You can find all documents in here: https://drive.google.co...

    Job posted in Fulham

    I have recently had planning permission approved for a ground floor extension to my flat in Fulham. I am only looking to have the 'shell' of the exte...

    Job posted in Luton

    we are looking at extending above single loft to give another bedroom with en-suite

    Job posted in Edgware

    Extension space around 16 square meters with standard fittings for a lounge space

    Job posted in Southall

    Gable roof single storey extension of 5m x 4m = 20sqm. The extension will have a skylight new good spec. kitchen and 5m sliding door. Also need a 3m x...

    Job posted in Waltham Abbey

    I intend to build a one-storey kitchen/diner extension at the back of the house, 15 square feet. I will be liaising with the Planning Department rega...

    Job posted in Uxbridge

    Kitchen extension,5-6 sq.m.

    Job posted in Arlesey

    Single story extension to make front porch and enlarge kitchen

    Job posted in Edgware

    Extension space around 16 square meters with standard fittings for a lounge space

    Job posted in Southall

    Gable roof single storey extension of 5m x 4m = 20sqm. The extension will have a skylight new good spec. kitchen and 5m sliding door. Also need a 3m x...

    Job posted in Waltham Abbey

    I intend to build a one-storey kitchen/diner extension at the back of the house, 15 square feet. I will be liaising with the Planning Department rega...

    Job posted in Uxbridge

    Kitchen extension,5-6 sq.m.

    Job posted in Arlesey

    Single story extension to make front porch and enlarge kitchen

    Job posted in Harrow

    I want to extend my kitchen and loft

    Job posted in Romford

    Total area is 90sqm double story plus 6 meter extension

    Job posted in Welwyn Garden City

    Quotation and availability for rebuilding the garage and a new wetroom extension to the property

    Job posted in Romford

    Build a two story extension. Utility and vedroom

    Job posted in Greenford

    Single story insulated rear extension

    Job posted in Harrow

    I want to extend my kitchen and loft

    Job posted in Romford

    Total area is 90sqm double story plus 6 meter extension

    Job posted in Welwyn Garden City

    Quotation and availability for rebuilding the garage and a new wetroom extension to the property

    Job posted in Romford

    Build a two story extension. Utility and vedroom

    Job posted in Greenford

    Single story insulated rear extension

    Job posted in Luton

    I want a single story 8m squared extension with a remodel of a small bathroom around 2.25m squared

    Job posted in Hemel Hempstead

    I’m looking to build an extension at the back of my house into the garden has a new kitchen diner and was just wondering on costs

    Job posted in CHELMSFORD

    Looking for a small car port roof

    Job posted in Beckton

    To build kitchen extension. Demolish wall between kitchen and reception, making open space.

    Job posted in Stevenage

    Single story at back of the house. Small utility room and the rest will extend existing kitchen diner. Bifold doors into the garden

    Job posted in Luton

    I want a single story 8m squared extension with a remodel of a small bathroom around 2.25m squared

    Job posted in Hemel Hempstead

    I’m looking to build an extension at the back of my house into the garden has a new kitchen diner and was just wondering on costs

    Job posted in CHELMSFORD

    Looking for a small car port roof

    Job posted in Beckton

    To build kitchen extension. Demolish wall between kitchen and reception, making open space.

    Job posted in Stevenage

    Single story at back of the house. Small utility room and the rest will extend existing kitchen diner. Bifold doors into the garden

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