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Phone: 01582 458 000

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Our team of qualified builders in Harpenden also have experience providing interior work that high quality and completed on time with minimum hassle. Find out more!

Interior works

Increase the value of your home with professional home extension and construction services. At Allsop Building, we have years of experience providing commercial and domestic property extensions.

Home improvements and extensions

Once you've got your property's interior just how you like it, we can make sure you get a fabulous exterior to match with our paving and patios service. We're highly experienced so you'll have nothing to worry about.

Paving and patios

Newly built conservatory paved patio area with steps and an occasional table Spacious lounge with wall mounted TV and retro syle reclining seating