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H CAROLAN CONSTRUCTION

Building Contractors
in London

Trusted builders in North London, delivering exceptional construction services with expertise, reliability, and attention to detail.

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The choice around the world

Innovative Modern
Design & Works

The final design package as per latest approval and client dreams. The final design package as per latest approval and client dreams and art work requirements to acceptance.

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The choice around the world

Innovative Modern
Design & Working

The final design package as per latest approval and client dreams. The final design package as per latest approval and client dreams and art work requirements to acceptance.

Get Started
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About Us
Who We Are?

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. 

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. 

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Since 1999

21

Years Experience
Since 1983

41

Years Experience
About Us

Trusted builders in Harrow & North London

At H Carolan Construction, we’ve been delivering exceptional craftsmanship and trusted construction services in Harrow and North London since 1983. With over 40 years of expertise, we specialise in residential and commercial construction, transforming homes, businesses, and infrastructure with precision, innovation, and quality.

As a leading building contractor, we take pride in our client-centred approach, ensuring every project reflects your vision while adhering to strict UK building regulations. Whether it’s a home extension, loft conversion, or large-scale commercial build, our skilled team of architects, builders, and tradespeople bring expertise, reliability, and attention to detail to every job.

A Commitment to Excellence & Innovation

Our reputation is built on trust, transparency, and quality workmanship. We integrate the latest construction technologies and sustainable building practices, ensuring that every structure is durable, energy-efficient, and built to last.

We don’t just build properties—we create functional, aesthetically stunning, and future-proof spaces that enhance property value, efficiency, and everyday living.

Ready to start your project? Contact us for a free consultation and let’s bring your vision to life!

  • ARCHITECTURE
  • INTERIOR DESIGN
  • FURNITURE
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Visualize your ideas

The best render of drawing by hand. The ease of super smart soft machines.

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Render 3D works

Modeling of your project as perfect drafting package for clients final decision.

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Gain a perspective

The joy of drawing by hand. The ease of super-smart software and development.

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Smart planing of Work process

This including consulting multi disciplinary consulting work with design and engineering, our world branches giving full support for executing professional work.

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Conceptual

Providing proposals to the client for the
preliminary with the full models
and rendering the reality.

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Schematic

Enhancement proposals to the client for the
preliminary with the full models
and rendering the approved.

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Development

Finalized proposals to the client for the
preliminary with the full models
and changes are sufficient.

Request For Estimation Quote Now

Contact Us

Get started on your project today! Receive a complimentary estimate for your next home renovation or construction project

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What We Do

Our Services

At H Carolan Construction, we offer a comprehensive range of construction services, from extensions and loft conversions to new builds and structural works. Whatever your project, our skilled team ensures quality and attention to detail in every aspect. Looking for expert builders in Harrow? View all services and discover how we can bring your project to life.

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Home Extensions & Renovations

Expand your living space with expertly designed house extensions, seamlessly blending functionality and aesthetics.

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Loft Conversions

Transform underutilised attic space into beautiful, practical living areas.

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Basements

Unlock new space and value with our specialized basement construction services in Harrow, built to the highest standards.

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Refurbishment

For high-quality refurbishment near you, trust H Carolan Construction to revitalize your space with expert craftsmanship and attention to detail.

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All Construction Related Works

From start to finish, we handle all construction-related work in Harrow, providing seamless solutions for every building need.

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Disabled Accessible Wet Rooms

We design and build disabled-accessible wet rooms that combine safety, comfort, and style for easy accessibility.

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Completed Projects
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Why Choose H Carolan Construction?

  • 40+ Years of Industry Experience – Established in 1983, we are trusted specialists in residential and commercial construction.
  • Diverse Project Capabilities – From bespoke home renovations to commercial infrastructure, we handle projects of all sizes.
  • Sustainability & Innovation – We use eco-friendly materials and cutting-edge technology for efficient, long-lasting builds.
  • Skilled & Experienced Team – Qualified builders, architects, and tradespeople dedicated to high-quality craftsmanship.
  • Client-Centred Approach – Every project is customised to meet your needs, budget, and timeline.
  • Stress-Free Building Process – Clear timelines, open communication, and expert guidance from start to finish.
  • Safety & Compliance Guaranteed – Full adherence to UK building regulations for complete peace of mind.
Recent Work

Our Gallery
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Get Your Project Started Today!

Your dream home or business space deserves the best. Whether you’re looking for a home extension, loft conversion, or a large-scale commercial project, we ensure a smooth, stress-free experience with exceptional results.

Call us today or request a free estimate to discuss your next project with Harrow’s trusted builders!

H Carolan Construction
H Carolan Construction
5.0
Based on 5 reviews
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Aga Let (Letagafood)Aga Let (Letagafood)
11:42 19 Oct 24
The easiest recommendation ever!We have done bathroom converted into a wet room. It was totally redone. Also a room extension, and flooring. I’m very satisfied with the outcome. High quality of work, great communication. Even though there was a couple of unexpected issues, they were solved promptly. Zero stress, zero delays. Thank you H Carolan Construction!
Tim SharkeyTim Sharkey
16:23 19 Aug 21
We contracted H Carolan Construction to build our new kitchen extension which also involved gutting the old kitchen, removing a chimney breast and replacing the solid floor which was compacting. The house is Victorian and since the extension is at the front it needed to blend in well. We are very pleased with the result which has doubled the kitchen size and looks great. Hubie is very keen on quality and doing a job well which I can confirm. The project also involved extensive plumbing and electrical work which were top quality.
Ali HAli H
19:15 27 Jan 21
Professional and reliable contractors, good quality work - efficient and timely. Could not of asked for a better service!
Angela MurphyAngela Murphy
20:32 15 Nov 18
I would highly recommend H Carolan Construction. The work carried out on my home recently was of the highest quality. Hubie is very conscientious and frequently came to my house to ensure everything was being carried out as it should be. Rory was great at communicating what would be happening and when and he consulted me when necessary throughout the process. Another reason to recommend this firm is that you do not need to go around checking that nothing has been missed as Hubie and Rory do this for you. High quality work from these guys and very reliable. You can instruct them with complete confidence!!
Jo LackJo Lack
11:28 11 May 18
Huby Carolan his son and his team recently adapted our bathroom to a wet room and repaved our patio and part of our neighbour's garden to gain disabled access. . We were absolutely delighted with every aspect of the work they carried out. Each one of the team was friendly, helpful, punctual and considerate and the standard of their work and attention to detail was superb.Huby or his son Rory visited us regularly to make sure all was going to plan and they kept us informed and involved every step of the way.We have no hesitation whatsoever in recommending them. I wish I couldgive them more than five stars!
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Our Skillful Team

Meet Our team

Hubie Carolan

Director of Construction

Rory Carolan

Director & Contracts Manager

Patrique

Quantity Surveyor Estimator

Eimer

office coordinator

Latest News

Our Blog

February 26, 2020

Building Contractors in London: Trusted by Harrow, Ealing and Hounslow Council

At H Carolan Construction, we take great pride in being recognized as trusted builders by Harrow Council, a testament to our commitment to delivering exceptional results and maintaining the highest standards in every project we undertake. Wi...

How to Find a Good Builder in the UK: A Guide for Homeowners

Finding the right builder for your project is crucial to ensuring that your home renovation, extension, or new build goes smoothly, stays within budget, and meets your expectations. With so many builders available in the UK, it can be overwh...

House Extension1
August 28, 2019
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Keep In Touch

call us

+44 2084229275

Email us

info@hcarolan.co.uk

Address

1 Eastcote Ln, South Harrow, Harrow HA2 8BW