What type of loft conversion?

In most cases, no. The majority of loft conversions in Haringey and the surrounding boroughs fall under permitted development rights, meaning you can go ahead without a full planning application — provided the work stays within set limits. For terraced houses, permitted development typically allows up to 40 cubic metres of additional roof volume; for semi-detached and detached houses, the allowance rises to 50 cubic metres. The new roof structure also cannot extend beyond the plane of the existing roof slope on the side facing the road, cannot be higher than the highest point of the existing roof, and materials used need to broadly match the existing house. Planning permission is usually required when your property is in a conservation area, is a listed building, sits within certain flat conversions, or when your design goes beyond permitted development limits — for example, a front-facing dormer or a design that significantly alters the roofline visible from the street. During your feasibility visit, we check your specific address against local planning constraints and tell you exactly which route applies before you commit to a design.

Building Regulations require a minimum clear headroom of 2.3 metres over the stairs and 2.1 metres across at least 50% of the usable floor area for the space to be classed as habitable. Below this, a loft conversion may still be possible as extra storage, but not as a proper bedroom, office or living room. Whether you clear these thresholds depends heavily on your existing roof pitch. A steeper pitch (common on many Victorian and Edwardian terraces across Haringey) generally gives more natural headroom than a shallow pitch. Where the existing structure falls short, options include raising the ridge height, adding a dormer, or in some cases a full hip-to-gable or mansard conversion — each of which recovers different amounts of headroom at a different cost. We measure your actual roof height, pitch and joist depth on-site during the feasibility visit and tell you honestly which conversion types are realistic before any design work begins, rather than proposing something that looks good on paper but won't pass building control.

Timelines vary by conversion type, but as a general guide: rooflight (Velux) conversions typically take 4 to 6 weeks, since no major roof restructuring is involved; dormer conversions typically take 6 to 9 weeks, covering structural steel work, the dormer build, insulation, first fix and finishing; hip-to-gable or mansard conversions typically take 8 to 12 weeks, given the scale of structural alteration to the roof. These figures assume planning permission (where required) and building control approval are already in place before work starts on site, and that access and weather are reasonably cooperative — loft work is more weather-sensitive than most other building projects because the roof is open at certain stages. We give you a realistic project-specific timeline in your written quote, including key milestones, so you know what to expect week by week rather than a vague overall estimate.

Yes — and this is non-negotiable regardless of whether planning permission was needed. Every loft conversion requires Building Regulations approval, covering structural strength, fire safety, insulation, staircase design, ventilation and means of escape. This applies even to conversions that qualify as permitted development for planning purposes. We handle the building control process for you from start to finish: submitting the application, coordinating site inspections at each key stage (foundations/steelwork, first fix, insulation, completion), and correcting anything flagged before it becomes a hold-up. On completion, you receive a completion certificate confirming the work meets current regulations — an essential document if you ever come to sell the property, since mortgage lenders and conveyancing solicitors will ask for it. We include this certificate and the full compliance paperwork in your handover pack as standard.

Generally, yes, and it is one of the more reliable ways to add value in London's terraced and semi-detached housing stock, where extending outward (via a side or rear extension) is often more restricted by garden size or planning constraints than extending upward. Industry estimates commonly cite loft conversions adding somewhere in the region of 10–20% to a property's value, though the actual figure depends heavily on your area, the quality of the finish, and whether the extra bedroom pushes the house into a different buyer bracket (for example, going from a two-bedroom to a three-bedroom house tends to open the property up to a wider pool of buyers, including families). Value added also depends on doing the conversion properly: a loft that isn't fully building-control compliant, lacks proper headroom, or has an awkward staircase can actually make a property harder to sell, since surveyors and buyers will flag it. This is part of why we prioritise a genuinely compliant, well-finished result over the cheapest possible build — it protects the value you're trying to add in the first place.

Our quotes are fixed-price and itemised, not a single lump sum, so you can see exactly what you're paying for. As standard, this covers: design and structural drawings, including building control submission; all structural work (steels, joists, staircase alterations); roof alterations (dormer construction, rooflights, or hip-to-gable/mansard work as applicable); insulation to current Building Regulations thermal standards; first and second fix electrics and plumbing (where required, e.g. for an en-suite); plastering, flooring and decoration to a ready-to-use finish; scaffolding, skip hire and site protection for the rest of your home; building control fees and final completion certificate. What's not included by default — and what we'll flag clearly during quoting if relevant to your project — are items like bespoke fitted furniture, non-standard sanitary ware upgrades, or external works unrelated to the loft itself (e.g. garden landscaping). If your loft has unusual complications once we open up the roof — such as an undersized foundation needing structural reinforcement, or asbestos requiring specialist removal — any additional cost is agreed with you in writing before work proceeds, never added retroactively to the final bill.