Which Trusted Trader logo

Loft Conversion Specialists
Call: 01527 543668

Facebook-f X-twitter Instagram Youtube

Our Loft Conversion Process from design to completion

HOW WE WORK WITH YOU

From First Enquiry to Finished Loft

If you’re considering transforming your unused attic into a beautiful new bedroom, home office, en-suite or living space, understanding the loft conversion process is essential.

At Charles Grosvenor, we manage everything – from the initial feasibility survey through to structural work, insulation, staircase installation and final certification. This ensures your conversion is safe, compliant, energy-efficient and built to last.

Below is a complete step-by-step guide to how we deliver high-quality loft conversions for customers across the UK…

Managing Director Bob Annis
Surveyor Paul Fairhurst
Surveyor Ken Tryer

Step 1:

Initial Consultation, Feasibility Study & Design

Every successful loft conversion begins with careful planning.

We offer a free, no-obligation feasibility survey, allowing us to provide a clear, fixed-price quotation with no hidden extras. As a family-run company, we never use high-pressure sales tactics – just straightforward advice based on over 50 years of experience.

This ensures your loft conversion is not only achievable — but practical, safe and tailored to your home.

What Happens During the Feasibility Survey?

One of our experienced surveyors will visit your home to:
• Assess your existing loft structure and roof type
• Measure available head height and structural spans
• Identify load-bearing walls
• Discuss how you intend to use the new space
• Review access options from the existing landing
• Explore dormer, VELUX or roofline alteration possibilities

We regularly convert:
• Traditional cut roofs
• Modern trussed roofs (including spans exceeding 8m using specialist structural systems such as Telebeam solutions)
• Bungalows
• Two and three-storey homes

All structural elements are designed in conjunction with a qualified structural engineer to ensure full compliance with UK Building Regulations.

At this stage, we begin preparing:
• Working drawings
• Structural calculations
• Layout designs

• Staircase positioning concepts

This ensures your loft conversion is not only achievable – but practical, safe and tailored to your home.

Step 2:

Planning Permission and Building Regulations

Many homeowners are unsure whether planning permission is required. We handle the entire process for you.

Do You Need Planning Permission for a Loft Conversion?

Not always.

Many loft conversions fall under Permitted Development Rights, allowing you to extend within certain volume limits. Where this applies, we apply for a Certificate of Lawful Development for your protection.

Where full planning approval is required, we:
• Prepare and submit all documentation
• Liaise directly with planning authorities
• Provide regular email updates
• Share reference numbers so you can track progress

All loft conversions require Building Regulations approval, regardless of planning status.

Your project will not be scheduled for construction until all approvals are in place, giving you complete peace of mind.

Studying a Charles Grosvenor loft conversion plan
Loft Conversion Planning & Design drawings

Step 3:

The Construction Phase - Building Your Loft Conversion

This is where your home begins its transformation. Our dedicated loft conversion team manages the entire build, following a structured and carefully engineered process.

Your project manager will meet you 2-3 weeks before the start date to:

• Review plans in detail
• Confirm staircase design and finishes
• Discuss scaffolding access
• Confirm window specifications
• Finalise internal details
 
Scaffolding is erected prior to commencement, and materials are delivered directly to site. Where required, cranes lift materials safely into position.
The Charles Grosvenor woodworking team cutting timber

Structural Floor Construction​

A new suspended floor is installed that transfers all structural loads to proven load-bearing walls — never to your existing ceilings.

Telebeam joists in place within a new loft conversion

This includes:
• Large timber or steel support beams (engineer specified)
• Premium timber joists
• Tongue-and-groove floor-grade chipboard
• Fibreglass quilt insulation to reduce sound transfer

This approach minimises vibration, prevents ceiling cracking below, and ensures long-term durability.

Dormer Loft Conversions​

Dormers are one of the most popular loft conversion types in the UK, because they significantly increase headroom and usable floor space.

Exterior view of a triple dormer loft conversion

Where a dormer is constructed, we:
• Remove a section of the existing roof slope
• Build robust 100mm x 50mm timber framing
• Reinforce cheeks with plywood gussets
• Install timber roof joists sized to span requirements
• Apply 3-layer torch-on felt bonded to 8mm plywood decking
• Fit vertical tile cladding matched to your home
• Install traditional lead flashings and soakers

This ensures weatherproofing, structural integrity and long-term performance.

Roof Windows & Natural Light

Where dormers are not required, high-quality roof windows provide light and ventilation without altering the roofline.

Staircase with VELUX window leading to bedroom with ensuite bathroom

In bungalow loft conversions, roof windows may also serve as compliant fire escape routes.

Plumbing & Heating Installation

Ensuite bathroom with shower and VELUX window

Depending on your design, we can:
• Install en-suite shower rooms or full bathrooms
• Relocate water tanks
• Extend soil vent pipes
• Install radiators (where system capacity allows)
• Connect and test heating, hot & cold supplies

All work complies fully with Building Regulations.

Wall & Sloping Roof Construction

All new walls are constructed using robust 100mm x 50mm timber framing.

A new roof being built from sustainably sourced timber

We install:
• High-performance PIR insulation boards
• Frame Foil vapour control layers
• 50mm ventilation voids to sloping ceilings
• Moisture and condensation protection systems

Our insulation performance exceeds that of a typical 275mm cavity wall, helping keep your loft warm in winter and comfortable in summer.

Bespoke Staircase Design & Installation

A loft conversion staircase is critical to both safety and design flow.

Each staircase is:
• Custom designed
• Manufactured in our dedicated workshop
• Built in a variety of materials, including softwood or hardwood
• Designed to meet Building Regulations
• Installed seamlessly over existing stairs where appropriate

We can match:
• Turned newel posts
• Balustrades
• Feature handrails

…ensuring your new staircase feels like a natural extension of your home.

Electrical Installation (Part P Certified)

Interior lighting design in a home cinema loft conversions

Our electricians install:
• Two-way stair lighting circuits
• Ceiling and wall lighting
• Twin power sockets positioned to suit your layout
• Electrical testing and certification

All installations are Part P tested and certified.

Step 4:

Plastering, Finishing & Completion

Once structural work is complete:
• The loft is fully plaster-skimmed
• The space is allowed to dry properly
• Second fix carpentry begins

Second Fix Includes:
Loft Team
• Skirting boards and architraves
• Stair handrails and balustrades
• Door hanging
• Discreet steel access panels

Plumber
• Bathroom suite installation
• Radiators and towel rails
• Full system testing

Electrician
• Switches and sockets fitted
• Light fittings installed
• Final certification issued

Final Inspection & Certification

Your project manager carries out a full internal inspection. Any minor items are recorded on a snagging list and completed promptly.

The Local Authority Building Inspector conducts a final inspection and issues your official Completion Certificate.

Finally:
• All surplus materials are removed
• Scaffolding is dismantled
• Your new loft space is ready to enjoy!

A master bedroom suite with seating area, storage and sofa
A double bedroom loft conversion
Why Understanding the Loft Conversion Process Matters

Choosing the right loft conversion company isn’t just about price – it’s about structural integrity, regulatory compliance and long-term comfort.

Our fully managed loft conversion process ensures:
✓ Structural safety
✓ Thermal efficiency
✓ Acoustic performance
✓ Fire regulation compliance
✓ Clear communication at every stage

A bedroom with single bed, storage, work desk with Apple mac, and three VELUX windows
Visit Our Showroom

If you’d like to see what’s possible, you’re welcome to visit our fully operational showroom to explore:

✓ Bespoke staircases
✓ Lighting layouts
✓ Roof windows
✓ Fitted shower rooms
✓ Finishing options

Contact us to arrange a visit or book your free feasibility survey.

The Charles Grosvenor Head Office loft conversion showroom