- +44 7417573749
- info@ionesidevelopment.co.uk
- Monday - Friday 08:00 - 18:00
Discover the ultimate solution for space constraints with a loft conversion in Harrow. Unlock the potential of your home and enjoy a stylish new living area. Ionesi Development is a trusted local building company based in Harrow (HA3), serving homeowners and landlords across the London Borough of Harrow, including Stanmore, Pinner, Kenton, North Harrow, Harrow on the Hill, and Wealdstone. Whether you need an extra bedroom, a home office, or a rental room to increase yield — our team manages your entire loft conversion from first survey to final sign-off.
IONESI Harrow Builders is a renowned loft conversion specialist dedicated to providing exceptional services for your loft conversion project in Harrow. As a leading loft conversion company in Harrow, we have extensive experience transforming lofts into dream spaces for homeowners. Our team of qualified builders, structural engineers, and architectural designers works from a single project plan — meaning you have one point of contact and no coordination headaches. We hold full public liability insurance, comply with all Harrow Borough Council planning requirements, and provide a written fixed-price quote before any work begins. Whether you require planning permission or need to comply with building regulations, our team of experts will guide you through every step of the process.
At our company, we pride ourselves on providing a diverse range of loft conversion options to suit our Harrow clients’ unique needs and preferences. Here are the loft conversion types we offer:
Extends the rear roof slope to create additional headroom and floor space. Ideal for maximising space in houses with limited roof space. The most popular choice for Harrow terrace and semi-detached homes.
Ideal for semi-detached and end-of-terrace properties in Harrow where a hipped roof limits available space. This conversion transforms the sloping hip end into a vertical gable wall, significantly increasing headroom and usable floor area. Often combined with a rear dormer for maximum space gain.
Velux loft conversions are an excellent option for those looking to introduce more natural light into their attic. Velux windows within the existing roofline provide an open and airy atmosphere. They are the most cost-effective option and do not alter the roofline — ideal for conservation areas.
An L-shaped dormer combines a rear dormer with a side return and is particularly effective for Victorian and Edwardian terraces — common throughout Harrow. This conversion creates a large, open-plan loft space with scope for multiple rooms, en suite bathrooms, and walk-in wardrobes.
A Mansard loft conversion involves altering the entire roof structure to create a new living space with steeply sloping sides and a flat roof. This type offers maximum floor space and versatility, and is popular on period properties across Harrow.
A gable loft conversion involves building a gable wall extension on the side of the property, resulting in increased living space and enhanced aesthetics.
A loft conversion in Harrow typically costs between £40,000 and £80,000, depending on the type of conversion, the size of your property, and the specification of finishes. As a rough guide:
Velux / rooflight conversions start from £25,000–£35,000. Rear dormer conversions range from £40,000–£55,000. Hip to gable and L-shaped dormers range from £55,000–£75,000. Mansard conversions — the most extensive structural alteration — typically cost £70,000–£90,000+.
All Ionesi Development quotes are fixed-price and provided in writing before work begins. We do not invoice beyond the agreed amount without your prior written approval. Payment is staged to mirror construction milestones, so you only pay for completed work.
Most loft conversions in the London Borough of Harrow fall under Permitted Development Rights, meaning no formal planning application is required. However, you will need a Lawful Development Certificate to confirm that your conversion complies with permitted development rules — we handle this application on your behalf.
Planning permission IS required if: your property is in a conservation area or Article 4 Direction zone; the conversion involves a mansard or front-facing dormer visible from a public road; or the proposed extension exceeds the permitted volume limits (50m³ for detached, 40m³ for semi-detached and terraced). Our team will advise you on your specific property before any design work is commissioned.
If your property shares a wall with a neighbour, a Party Wall Agreement (or Party Wall Award) will also be required under the Party Wall etc. Act 1996. We can provide guidance on this process and recommend a qualified party wall surveyor where needed.
Prices range from £25,000 for a basic Velux conversion to £90,000+ for a full Mansard. Most Harrow homeowners invest £40,000–£60,000 for a rear dormer with en suite. We provide a written fixed-price quote before work begins.
Most conversions fall under Permitted Development Rights and do not require full planning permission. However, a Lawful Development Certificate is required in all cases. Conservation area properties and mansard conversions may require full planning. We advise on your specific situation during the free survey.
Typically 10–14 weeks from build start, depending on the size and type of conversion. The design and planning stage adds a further 6–10 weeks before construction begins.
No. The majority of structural work is carried out from scaffolding, outside your property. You can continue to live in your home throughout. The main disruption is noise during working hours.
If your property is semi-detached or terraced, a Party Wall Notice must be served on affected neighbours under the Party Wall etc. Act 1996. Your neighbours can either consent or appoint a surveyor to draft a Party Wall Award. We can guide you through this process.
A well-executed loft conversion typically adds 15%–25% to a property’s value in the London Borough of Harrow. This can represent £75,000–£150,000 on a typical Harrow semi-detached property.
The right type depends on your roof structure and budget. We offer Velux, Rear Dormer, Hip to Gable, L-Shaped Dormer, Gable End, and Mansard conversions. Our free survey will identify which options are feasible for your specific Harrow property.
If you are looking for a reliable and experienced Harrow loft conversion company, look no further than Ionesi Development. We are based at 154 Courtenay Ave, Harrow HA3 6LW — local to you, not a call centre. In addition to loft conversions, we offer landscaping and painting services in Harrow, helping homeowners enhance both indoor and outdoor spaces. We cover the full London Borough of Harrow including Harrow on the Hill, Stanmore, Pinner, Kenton, Wealdstone, North Harrow, and Rayners Lane. We provide complimentary quotes and can organize a free consultation to address your requirements.
Call us: +44 7417573749 | Email: info@ionesidevelopment.co.uk
+44 7417573749
info@ionesidevelopment.co.uk
154 Courtenay Ave, Harrow HA3 6LW, UK
Ionesi Development is a passionate team of experts dedicated to delivering exceptional renovation work. With a commitment to quality and customer satisfaction, we strive to turn visions into masterpieces.