Extension Builders

Extension builders construct new space onto an existing property. This can include rear extensions, side extensions, kitchen extensions, wraparound extensions and double-storey extensions.

The work can involve foundations, drainage, walls, roofing, steelwork, glazing, insulation, electrics, plumbing, plastering and finishing details.

Choose an extension builder with experience in the type of project you are planning and the ability to explain the process clearly.

It is also sensible to ask what is included in the quote, how changes are handled, whether similar projects have been completed and what may affect the final cost.

Some house extensions can fall under permitted development if they meet the required limits and conditions.

Planning permission may be needed for larger extensions, certain side extensions, two-storey work, restricted areas, flats, listed buildings or properties where permitted development rights have been removed.

Most extensions require Building Regulations approval because they create new habitable space and affect the structure of the property.

Building Regulations can cover foundations, structure, insulation, drainage, ventilation, electrics, glazing, fire safety and overall construction standards.

The cost depends on size, access, design, structure, materials, services and finish. A basic single-storey extension will usually cost less than a double-storey extension or large kitchen extension with extensive glazing and structural openings.

TRM Innovations Ltd can provide a free estimate after looking at the property and understanding what you want to build.

Timescales vary depending on the size and complexity of the extension. Groundworks, foundations, walls, roofing, windows, electrics, plumbing, plastering, inspections and finishing work all affect the schedule.

Planning, Building Regulations, materials, weather and design changes can also add time.

Yes, TRM Innovations Ltd can help with kitchen extensions where homeowners want more cooking, dining and family space.

Because the company also specialises in kitchens, the build can be planned around the finished kitchen layout, plumbing, electrics, lighting, storage and day-to-day use.

Yes, single-storey extensions are a common way to add more space to the ground floor of a home.

They can be used for kitchens, dining rooms, living spaces, utility rooms, offices, playrooms or better garden-facing layouts.

A double-storey extension can add space on both the ground floor and first floor where the property, structure and planning position allow.

This type of project usually needs more detailed planning because it affects rooflines, structure, neighbouring properties, bedroom layouts and the external appearance of the home.

An extension adds new space to the property, usually by building outwards or upwards.

A conversion changes existing space into a new use, such as converting a garage, loft or basement into a room.

Yes, a utility room can be included in an extension if there is enough space and suitable access to plumbing, drainage and ventilation.

Utility rooms are often planned alongside kitchen extensions because they help move appliances, laundry and storage away from the main kitchen.

Yes, a downstairs WC can often be added as part of an extension or wider ground-floor remodel.

Drainage, ventilation, access, privacy and usable floor space should be considered before the layout is finalised.

Many homeowners remain in the property during extension work, but disruption should be expected.

If the project affects the kitchen, heating, electrics, plumbing, rear access or several rooms at once, temporary arrangements may be needed.

Structural steelwork may be needed when walls are removed, large openings are created or the extension needs to support part of the existing house.

A structural engineer may be required to calculate the correct support, and Building Regulations approval will usually apply.

Yes, many extensions are built to match the existing property using similar brickwork, roof tiles, windows, doors and external finishes.

Some homeowners prefer a more modern contrast. The right choice depends on the home, planning position, budget and personal preference.

Key checks include planning permission, permitted development rules, Building Regulations, drainage, access, boundaries, party wall matters, structure and budget.

A site visit helps identify these issues early so the design and quote are more realistic.

Extension builders can usually advise what drawings or design information may be needed before the work can be priced properly.

For some projects, architectural drawings, structural calculations or Building Regulations drawings may be needed before work starts.

A well-planned extension can add value if it creates useful space, improves the layout and suits the property.

The value gained depends on the location, build quality, room use, finish and how the cost compares with local property values.

Yes. TRM Innovations Ltd is based in Bexleyheath and covers Dartford along with surrounding areas across Bexley, South East London and nearby Kent.

This includes Welling, Sidcup, Bexley, Blackfen, Erith, Crayford, Abbey Wood, Eltham, Chislehurst, Bromley and Greenwich where suitable.

TRM Innovations Ltd has been running since 2014 and specialises in extensions, refurbishments and kitchens. That experience is useful when an extension needs to work structurally, practically and visually with the existing home.

The team provides free estimates, local building knowledge and practical advice for homeowners across Bexleyheath, Dartford and surrounding areas.