In many cases, no. Most loft conversions fall under Permitted Development (PD) rights, provided the design fits within specified volume limits (typically up to 40 cubic metres for terraced houses, or 50 cubic metres for semi-detached and detached homes) and meets materials and height criteria.

However, full planning permission will be required if:

- Your property is a flat or maisonette.

- You live in a designated area (e.g., Conservation Area or Area of Outstanding Natural Beauty).

- The front roof slope faces the highway and you plan to raise it or add dormers facing the street.

- You are altering the main roof ridge line significantly.

At Kovacs Construction, we manage the full process - verifying your PD rights or securing full planning consent and Lawful Development Certificates before any work begins.

A typical loft conversion takes between 6 to 10 weeks from structural steel installation to final finishes.

Costs vary depending on size, conversion type and finish level, so we provide a tailored quote after an initial visit.

Loft conversion costs vary, but see some examples below:

Velux / Rooflight Conversion: ~£40,000 - £55,000 + VAT

Dormer Conversion: ~£50,000 - £75,000 + VAT

Mansard / Hip-to-Gable Conversion: ~£65,000 - £95,000+ + VAT

We provide detailed, itemised quotes covering structural engineering, building regulation sign-offs, and complete interior finishes.

Many single-storey rear or side-return extensions can be completed under Permitted Development, provided they meet key criteria regarding height, depth and boundary proximity (e.g., up to 3m deep for terraced/semi-detached homes, or up to 6m under the Prior Approval / Larger Home Extension scheme).

Planning permission is generally required for larger two-storey extensions, wrap-around extensions, listed buildings or properties within Conservation Areas. We evaluate your site upfront to establish the correct statutory pathway.

A single-storey kitchen or rear extension usually takes 12 to 16 weeks, while larger two-storey or complex structural reconfiguration projects range from 16 to 24 weeks.

- Loft Conversions: Yes, in almost all cases. Work is accessed externally via scaffolding for the first few weeks, keeping internal disruption to a minimum until the new staircase is installed.

- Extensions: Yes, provided temporary kitchen/utility provisions can be set up in an unaffected room.

- Major Overhauls / Basements / Underpinning: For extensive multi-level reconfigurations, temporary relocation during the structural phase is often recommended for comfort and safety.

Under Permitted Development, you can generally build up to the property boundary line, subject to specific height rules (for example, eaves height must not exceed 3 metres if within 2 metres of a boundary).

If you are building on or right alongside a shared boundary wall, the work falls under the Party Wall etc. Act 1996. This requires formal Party Wall Agreements with neighbouring owners before starting groundwork or structural alterations. Kovacs Construction coordinates closely with accredited Party Wall surveyors to manage this process smoothly on your behalf.

A well-designed extension or loft conversion typically adds 15% to 25% to a home's overall market value. Beyond adding financial equity, ground-floor extensions fundamentally transform daily living by creating open-plan kitchen-dining zones, improving light flow and connecting indoor spaces to the garden.

Yes, absolutely. Permitted Development only relates to planning permission (the right to alter the size and appearance of the building). Building Regulations govern structural integrity, fire safety, insulation, damp-proofing and electrical/plumbing safety. Every loft conversion, extension or structural alteration requires full Building Regulations sign-off and completion certificates from Building Control.

Basement excavation and underpinning require heavy structural work, so noise, dust and ground movement management are significant factors during the initial phase. However, we engineer our site operations to minimize disruption.

Excavation and debris removal are routed directly through external access shafts or lightwells whenever possible.

Acoustic hoardings, dust extraction barriers and precise vibration monitoring protect the surrounding structure and neighboring properties.

A subterranean excavation or comprehensive basement conversion generally takes 6 to 10 months, depending on size and soil conditions.

A tanking/waterproofing system suited to the specific basement and groundwater conditions, plus proper drainage.

We install fully compliant Type C Cavity Drain Membrane Systems (BS 8102 standards).

- Wall & Floor Membranes: High-density studded membranes line the internal face of walls and floors.

- Perimeter Drainage Channels: Any ground moisture entering behind the membrane is directed down into perimeter drainage channels.

- Sump & Pump System: The water is safely pumped away into mains drainage via dual submersible pumps with battery backup power.

Yes. We frequently collaborate with clients to design phased schedules of work. For instance, we can complete structural weather-tight shells (foundations, steels, walls and roof) in Phase 1, allowing you to complete internal fit-outs, kitchens or bathrooms in subsequent phases as budget allows.

Yes. Working with historic structures, original features, period brickwork, timber frame repairs and listed buildings requires specialized craftsmanship and knowledge of heritage materials (such as lime mortars and matching historic joinery). We liaise directly with Conservation Officers to ensure all work respects the historic fabric while introducing modern structural stability. Also listed properties will need additional consents.

On major structural projects, unforeseen conditions - such as unmapped underground drainage, hidden historic structural defects or varying ground conditions - can arise.

Our protocol is built on immediate transparency:

- Immediate Assessment: Work in the affected zone pauses while our site manager and structural engineers evaluate the issue.

- Clear Written Options: We provide a transparent technical solution along with any timeline or cost implications.

- Formal Approval: No additional work or cost is incurred without your explicit written approval via a formal Variation Order.