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St Albans & Harpenden loft conversion specialists
Loft Conversions That Create Real Rooms in St Albans
Transform your unused roof space into a bedroom, office, or suite — with an en-suite, staircase and building regs sign-off included as standard.
Structural engineering in-houseWe design and build the structural frame ourselves. No subcontracting the critical parts.
Victorian & Edwardian roof expertsCut rafter, trussed rafter, mansard, L-shaped — built across period terraces and semis.
Permitted development to full planningWe advise on planning rights, handle conservation area applications, and manage building regs sign-off end to end.
Loft conversion cost in St Albans
How much does a loft conversion cost in St Albans?
In St Albans and Harpenden, loft conversions typically range from around £29,000 for a basic Velux/rooflight conversion to £125,000+ for a larger dormer or mansard with premium finish. Key cost drivers include conversion type, roof structure, headroom, staircase specification, en-suite quality, and whether planning permission is required. Use the calculator below for a project-specific estimate.
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Loft conversion cost calculator
St Albans & Harpenden — 2026 prices
Estimated cost range (excl. VAT)£54,000 – £89,500Indicative estimate. Includes labour and materials. Excludes VAT (20%).
About Maycor
Your Roof Space Has More Value Than You Think
Maycor converts lofts across St Albans, Harpenden and North London. We handle the whole project — structural design, planning applications, building regs, and every trade — so you don't have to coordinate a dozen different contractors.
Every conversion starts with a free survey. We measure headroom, assess your roof structure, check permitted development rights, and give you a fixed price before we start. No surprises mid-project.
17+Years
150+Lofts converted
100%Building regs sign-off
What you get
Everything Included in Your Loft Conversion
Structural engineer design & calculations
New floor structure & insulation
Dormer structure or mansard rebuild
New staircase — supply and fit
Rooflight or dormer windows
First & second fix electrics (all floors)
En-suite plumbing & tiling (where selected)
Plastering, fire-rated walls & decoration
How it works
From Roof Survey to Completed Room
Survey & design
Structural engineer survey, confirm headroom, architectural drawings, and planning application if needed.
Structural works
Roof structure, new floor, dormer shell or mansard rebuild — all watertight before second fix begins.
Second fix & finish
Electrics, en-suite, plaster, staircase, and decoration — complete room, signed off by building control.
What clients say
Real Maycor Loft Conversions
Victor's team built a rear dormer on our Finchley Victorian. They surveyed everything thoroughly before giving a fixed price — and hit it.
L-shaped dormer on our Islington terrace. Two bedrooms and a bathroom where there was nothing. Brilliant work.
Hip-to-gable on our 1930s Barnet semi. The loft feels like a proper floor — not an afterthought.
Local knowledge
We Know St Albans Lofts
St Albans and Harpenden roofs are not one-size-fits-all. Georgian and Victorian terraces around the Cathedral and city centre, 1930s semis further out — each has its own quirks and constraints. We know exactly what planning officers, building control inspectors, and party wall surveyors expect locally.
Permitted development rights
Most rear dormers don't need planning if they add under 40m³ on a terrace (50m³ on semi/detached). We advise at the survey.
Conservation areas
St Albans has extensive conservation areas around the Cathedral and city centre. We handle conservation area applications and pre-application advice, so you know where you stand before work starts.
Georgian & Victorian terraces
L-shaped dormers and mansards on period roofs — common across St Albans and Harpenden's older streets.
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