House extensions in Maidstone, built by a qualified bricklayer
Get the kitchen, living space or extra bedroom you need without selling up. One team plans the build, lays the brickwork and coordinates every trade, so you deal with one contractor from groundworks to handover.
Free site visit and written quote · City & Guilds and NVQ Level 2 & 3 Brickwork
City & Guilds
Qualified bricklayer
NVQ Level 2 & 3
In Brickwork
10-yr / 5-yr
Roofing / paving guarantees
Team of 4
Plus trusted trades
24/7
Emergency roofing
Service overview
House Extensions: what you need to know
What it is
A house extension adds new floor area to your existing home, usually to the rear or side, and occasionally to the front or over a garage. It involves foundations, drainage, brick or block walls, a roof, windows and doors, and the internal finish that ties the new space into the old. We carry out the structural and building work ourselves and bring in trusted electricians and plumbers for the services.
Who it is for
Extensions suit homeowners across Maidstone, Bearsted, Tunbridge Wells and wider Kent who like where they live but have outgrown the space. Growing families, people working from home, and anyone who wants an open-plan kitchen-diner or ground-floor bedroom may benefit from extra space. We also build extensions for landlords and commercial clients who need extra usable floor area.
When you need it
Most people start thinking about an extension when the kitchen is too small to eat in, children need their own rooms, or a home office is taking over the dining table. It is also worth considering when the cost of moving, including stamp duty, agents and removals, starts to look worse than staying and building.
Why professional work matters
An extension is a structural job tied to your existing house. Foundations have to be right for the ground, new brickwork has to bond and match, and the roof junction with the old building has to stay watertight for decades. Mistakes here are expensive to put right later. Michael brings City & Guilds and NVQ Level 2 and Level 3 qualifications in Brickwork to the building work.
The risk of waiting
What happens when an extension is built badly
An extension that is rushed, under-specified or built by an unqualified team can cost far more than it saved. Possible problems with poorly planned or built extensions include the following.
Cracking and movement
Foundations dug too shallow or on the wrong ground move over time. Cracks open up where the new walls meet the old house and get worse every winter.
Leaks at the roof junction
Poorly flashed junctions between the new roof and existing wall let water in. Damp patches, stained ceilings and rotten timbers follow.
Mismatched brickwork
Brick that does not match in colour, size or bond makes the extension look bolted on and can reduce the value it adds to the property.
Budget overruns
Vague quotes leave room for extras. Without a clear written price and agreed stage payments, costs can drift well past what you planned.
Common mistakes to avoid
- Choosing the cheapest quote without checking what is actually included.
- Paying most of the money upfront before work has started.
- Hiring separate trades with nobody responsible for the overall build.
- Leaving drainage and ground conditions until the digger is on site.
Our process
How your house extensions job runs
Step 1
Free site visit
Michael visits your home, looks at the ground, existing walls and access, and talks through how you want to use the new space.
Step 2
Written quotation
You receive a clear written quote listing the work included, so you can compare it properly and plan your budget.
Step 3
Groundworks and foundations
We excavate, lay foundations and deal with drainage before any walls go up. This is the part that decides how well the extension performs for decades.
Step 4
Structure and roof
Brickwork and blockwork go up, steels are installed where needed and the roof goes on to make the building watertight.
Step 5
Services and finish
Our trusted electricians and plumbers complete their work, and we finish the building so the new space joins the old cleanly.
What you get
Why homeowners choose Speller
One contractor, one point of contact
Michael is your point of contact. Trusted subcontracted electricians and plumbers are coordinated when the project needs them.
Brickwork that matches
A City & Guilds bricklayer with NVQ Level 2 and Level 3 qualifications lays and matches the brick.
Predictable payments
Larger projects run on a one-third deposit for materials, then 3 to 4 stage payments agreed before work starts.
Less disruption
Groundworks, structure and finish are planned in order so the house stays liveable for as long as possible.
Space without moving
You keep your location, schools and neighbours, and avoid the costs of selling and buying.
Peace of mind
A free site visit and written quote mean you know what you are getting before you commit to anything.
In detail
Types of house extension we build
Every house and plot is different, so the right extension depends on your layout, garden, budget and how you want to live. These are extension options to discuss at a site visit in Maidstone or wider Kent.
Single-storey rear extensions
The most popular choice for kitchen-diners and family rooms. A rear extension opens the back of the house onto the garden, often with bifold or sliding doors and a flat or pitched roof with roof lights.
Because it sits at ground level, the foundations, drainage and roof junction need careful planning, especially where existing drains run across the back of the property.
Side-return and wraparound extensions
Common on terraced and semi-detached houses where a narrow side passage is wasted space. Filling the side return widens the kitchen; combining it with a rear extension creates an L-shaped wraparound.
These builds often sit on or near a boundary, so neighbouring walls, party wall matters and drainage need attention early.
Double-storey extensions
Building over two floors adds a bedroom or bathroom upstairs as well as living space downstairs, often for a modest increase on the cost of a single-storey build because the foundations and roof are shared.
Structural steel work is often needed to carry loads where new openings are formed in the existing house.
Materials and finishes
We build in brick or block depending on the design. Where the extension needs to blend in, we match brick colour, size and bond to the existing house. Where a contrasting finish works better, silicone render over block gives a clean, low-maintenance exterior.
Roofs can be pitched with tiles or slates to match the house, or flat with roof lights for maximum daylight.
Residential and commercial
We offer extension work for homeowners and commercial clients. Commercial jobs often need more attention to access, working hours and keeping the building usable during the work, which we plan into the programme from the start.
House Extensions across Maidstone and Kent
We are based in Maidstone and carry out house extensions for homeowners and businesses across the towns and villages below, as well as wider Kent, London and the South East. Wherever you are, the process is the same: a free site visit, a written quote and the work led by Michael on site.
Guide
Planning your house extension
Start with how you want to live
Before thinking about size, think about how the space will be used. A kitchen-diner needs room for a table, good light and a link to the garden. A ground-floor bedroom needs privacy and access to a bathroom. Telling us how you want to use the space at the site visit helps shape a build that works rather than just adding square metres.
Budgeting realistically
The structure is only part of the cost. Kitchens, flooring, glazing and decoration add up. Your written quote sets out exactly what our work includes so you can budget for the rest. On larger projects, a one-third deposit secures materials and the remaining balance is split across 3 to 4 agreed stage payments.
What happens to your existing house
We build the new structure first and keep it weathertight before opening into the existing house wherever possible. That keeps the house secure and liveable for as long as possible and limits dust and disruption to the final stages.
How quoting and payment work
Every house extensions enquiry starts with a free, no-obligation site visit and a written quotation, so you can see exactly what is included before deciding. On larger projects we take a one-third deposit to secure materials, and the balance is split across 3 to 4 stage payments agreed before work starts.
Who will be on site
Work is led by Michael Speller, a City & Guilds qualified bricklayer with NVQ Level 2 and Level 3 in Brickwork, with a core team of four. Where your project needs electrical or plumbing work, we bring in trusted subcontracted trades and coordinate them, so you deal with one contractor throughout. We hold public liability insurance.
Questions
House Extensions FAQs
How much does a house extension cost in Maidstone?
It depends on size, design, ground conditions and finish. We do not give guesses over the phone. Book a free site visit and you will receive a written quotation for your specific extension.
How long does an extension take to build?
Timescales depend on the size and complexity of the build. We will give you a realistic programme with your written quote so you can plan around it.
How do payments work?
For larger projects we take a one-third deposit to secure materials. The balance is split across 3 to 4 stage payments agreed before work starts, with the remaining balance covered by those agreed payments.
Do you handle the electrics and plumbing?
Yes. We bring in trusted, subcontracted electricians and plumbers and coordinate them as part of the build, so you deal with one contractor.
Will the new brickwork match my house?
Michael is a City & Guilds qualified bricklayer with NVQ Level 2 and Level 3 in Brickwork. Matching brick, bond and mortar to your existing house is part of the job.
Do you offer a guarantee on extensions?
Our published guarantees are 10 years on roofing and 5 years on paving. Ask Michael about guarantee terms for your extension at the site visit.
Do you build extensions outside Maidstone?
Yes. We work across Bearsted, Aylesford, West Malling, Tonbridge, Tunbridge Wells, Sevenoaks, Chatham, Headcorn, wider Kent, London and the South East.
Can I stay in the house during the build?
Whether you can stay depends on the scope, safe access and which facilities remain available. Discuss this with Michael at the site visit before making arrangements.
Find out what your extension will cost
Book a free site visit. Michael will look at your home and send a written quote, with no obligation to go ahead.
City & Guilds qualified · Free written quote · No obligation