Extensions & Loft Conversions in London
Add Space to Your Home Without Moving
Extending your home is one of the most cost-effective ways to gain the space you need. Whether it is a rear extension to create an open-plan kitchen-diner, a side-return infill, or a loft conversion to add an extra bedroom and bathroom, KN Perfect House Ltd handles the entire project from planning through to completion.
We design extensions that complement your existing property, maximise natural light, and meet local planning requirements, coordinating with structural engineers and architects where required. Many rear extensions and loft conversions in West London fall under Permitted Development rights, meaning no formal planning application is needed - we guide you through the process to confirm what applies to your property.
Our team manages all structural work, including steel beam installation, foundation work, roofing, and waterproofing. Once the structure is watertight, we complete the interior fit-out: plastering, electrical and plumbing first-fix and second-fix, flooring, kitchen or bathroom installation, and full decoration.
Loft conversions are a particularly popular choice across West London. We specialise in dormer and L-shaped conversions that create generous rooms with full standing height. Every loft conversion includes proper insulation, fire safety measures, and Building Regulations compliance.
If you are considering adding space to your home, contact us for a free site visit. We will assess your property, discuss your options, and provide a clear, itemised quote.
Why Homeowners Choose Us
Planning Guidance
We confirm Permitted Development rights and manage planning applications where required.
Structural Expertise
Steel beams, foundations, and roofing - our team handles all structural elements.
Complete Fit-Out
From shell to finished room - plastering, electrics, plumbing, and decoration included.
Minimal Disruption
We plan the build sequence to keep disruption to your daily life as low as possible.
Our Process
Site Visit & Feasibility
We assess your property, confirm planning requirements, and discuss design options.
Architectural Drawings & Approvals
We produce plans and secure any necessary planning or Building Regulations approval, coordinating with architects where required.
Structural Build
Foundations, steelwork, walls, roofing, and weatherproofing are completed to make the extension watertight.
Interior Fit-Out & Handover
Plastering, electrics, plumbing, flooring, and decoration transform the shell into a finished living space.
Frequently Asked Questions
Many single-storey rear extensions fall under Permitted Development, meaning no planning application is needed. We check the specifics for your property and confirm before work begins.
A typical dormer loft conversion takes 8 to 12 weeks from scaffolding going up to final decoration. We provide a detailed programme before starting.
In most cases, yes. A well-executed loft conversion adding a bedroom and en-suite bathroom can significantly increase your property value, often exceeding the cost of the conversion itself.
Yes. Two-storey extensions require planning permission in most cases. We manage the application process, coordinating with architects where required, and handle all structural and finishing work.
Areas We Cover
Shepherd's Bush
W12Hammersmith
W6Fulham
SW6Chiswick
W4Acton
W3Kensington
W8, W14Ealing
W5Ready to Start Your Project?
Contact us today for a free consultation and detailed quote. Our team is ready to discuss your residential construction project and provide an honest assessment of scope, timeline, and cost.
Email: knperfecthouse@gmail.com