Specialist Construction Services

Complete turnkey architectural construction delivered by vetted in-house tradesmen. We manage planning approvals, structural engineering, procurement, build and final building control sign-off.

House Extensions Loft Conversions Full Refurbishments Kitchens & Bathrooms Underfloor Heating & MEP Silicone Render & Landscaping
Two-Storey House Extension in London

Single & Double-Storey House Extensions

Expand your living space and dramatically enhance your property value. We design and construct bespoke rear extensions, side-return infills, wraparound extensions, and two-storey residential additions across London and surrounding areas.

From trench excavation, damp proofing, and heavy RSJ steel knock-throughs to flush floor-to-ceiling aluminium bifolds and architectural lantern roofs, we create light-filled, open-plan spaces tailored for contemporary family living.

✓ Rear & Side-Return Infills
✓ Two-Storey Additions
✓ Structural RSJ Steel Knock-Throughs
✓ Aluminium Bifolds & Crittall Doors
✓ Flat Warm Roofs with Roof Lanterns
✓ Full Building Regs Sign-Off
Get Quote for Extension View Extension Projects
Rear Dormer Loft Conversion

Luxury Dormer, Mansard & Velux Loft Conversions

Unlock the hidden square footage above your head. We transform dark, cramped attics into breathtaking master bedroom suites complete with walk-in dressing rooms, luxury ensuite shower rooms, and panoramic London skyline views.

Our structural engineers calculate steel ridge beam insertions, custom fabricate new timber staircases that seamlessly match your existing home layout, and install high-performance Celotex/Kingspan acoustic and thermal insulation.

✓ Rear Dormer & Hip-to-Gable Lofts
✓ Mansard & L-Shaped Conversions
✓ Velux Cabrios & Juliette Balconies
✓ Custom Bespoke Staircases
✓ Luxury Ensuite Bathrooms
✓ Fire Door & Smoke Regs Compliance
Get Quote for Loft View Loft Projects
Full House Refurbishment Interior

Whole-House Renovation & Structural Remodelling

Whether modernising a 1930s semi-detached or reconfiguring a multi-storey Victorian townhouse, GN Build Ltd manages complete strip-outs to bare brick through to turnkey architectural handover.

We remove obsolete load-bearing internal walls, insert heavy structural steel box frames, replace subfloors, install complete new 18th-Edition electrical consumer units, re-pipe multi-zone central heating, and deliver pristine drylining and plastering.

✓ Strip-out to bare brickwork
✓ Structural steel goalpost frames
✓ Complete NICEIC electrical rewire
✓ Gas Safe heating & unvented cylinders
✓ Acoustic acoustic insulation & plastering
✓ Bespoke joinery, doors & architraves
Get Quote for Refurbishment View Refurb Projects
Luxury Open-Plan Kitchen & Island

Luxury Kitchens & Designer Bathrooms

The heart of your home deserves breathtaking craftsmanship. We design and install bespoke German and British kitchens, oversized quartz waterfall islands, seamless handleless units, and integrated smart appliances.

In bathrooms and master ensuites, we craft zero-threshold walk-in wet rooms, concealed thermostatic rainfall showers, freestanding double-ended stone baths, back-lit anti-fog LED mirrors, and precision book-matched porcelain tiling.

✓ Bespoke handleless cabinetry
✓ Quartz, granite & marble worktops
✓ Quooker boiling taps & Siemens appliances
✓ Zero-barrier walk-in wet rooms
✓ Concealed Hansgrohe brassware
✓ Custom Finnish sauna integrations
Get Quote for Kitchen / Bath View Interior Projects
Underfloor Heating Pipework Installation

Underfloor Heating, Boilers & MEP Engineering

Modern living demands clean lines free from unsightly radiators and optimal thermal comfort. We engineer multizone hydronic (wet) underfloor heating systems integrated with screed layers for maximum heat retention.

Combined with high-efficiency system boilers, unvented stainless steel hot water cylinders providing mains-pressure showers to multiple bathrooms simultaneously, and smart app-controlled thermostats (Nest, Hive, Heatmiser).

✓ Multi-port underfloor heating manifolds
✓ Liquid flow screed & thermal insulation
✓ Unvented megaflo cylinders
✓ Gas Safe certified boiler installations
✓ Smart multi-zone room thermostats
✓ Architectural recessed LED coving
Get Quote for Heating View Technical Photos
Insulated Garden Outbuilding and Landscaping

Silicone Rendering, Driveways & Garden Studios

Transform the curb appeal and thermal efficiency of your property. We strip back dated pebble dash or tired brickwork and apply British-weatherproof Weber and K-Rend silicone through-colour monocouche rendering systems.

We also specialise in vitrified porcelain garden patios, permeable block-paved driveways, London brick boundary walls, and standalone insulated garden outhouses for home offices and gyms (as reviewed by our London and surrounding area clients).

✓ Weber & K-Rend silicone monocouche
✓ External wall insulation (EWI) systems
✓ 20mm Vitrified outdoor porcelain paving
✓ Block paving & dropped kerb driveways
✓ Insulated timber/brick garden rooms
✓ London stock brick front porches
Get Quote for Landscaping View Exterior Works

Common Questions About Our Services

Clear answers on planning permissions, timelines, and how GN Build Ltd protects your investment.

Many single-storey rear extensions up to 6 or 8 metres, as well as rear dormer loft conversions up to 40m³ (terraced) or 50m³ (semi-detached), fall under Permitted Development rights and do not require full planning permission. However, they always require Building Regulations sign-off. We advise you on the exact requirements during our initial site survey and submit Lawful Development Certificates on your behalf.
A standard single-storey rear extension typically takes 8 to 12 weeks from ground excavation to plaster finish. A dormer loft conversion usually requires 5 to 7 weeks. A whole-house multi-storey refurbishment with structural steel insertions takes between 12 and 18 weeks. We provide a firm, contractually agreed milestone schedule before work begins.
Yes. We handle the submission of Initial Notices to approved independent inspectors or local authority building control (e.g. Havering, Redbridge, Barking & Dagenham). If your work affects an adjoining boundary or party wall, we assist with Party Wall notices and structural engineer calculations.
GN Build Ltd carries comprehensive £5,000,000 Public Liability Insurance and employer's liability coverage. All structural works including steel beams, foundations, and roofs are covered by our 10-year structural guarantee, accompanied by final local council Building Control Completion Certificates.

Let's Plan Your Construction Project

Speak with Baljinder Singh and our senior site team for free advice and a comprehensive, itemised estimate.

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