From foundations
to finish.

A house extension is a new structure built onto an existing property to add extra living space, typically involving foundations, brickwork or blockwork, a roof and full internal finishing. It can be single storey or double storey depending on what space is needed and what the property and plot allow. The finished extension is designed to connect cleanly with the existing house, both structurally and in appearance.

An extension is usually considered when a family has outgrown the existing layout, when a kitchen or living space feels too cramped for how it's actually used, or when moving house would be more disruptive or costly than adding space. It can also suit properties where an extra bedroom or home office is needed but the plot doesn't allow for a full rebuild. Extending rather than moving often makes sense where the location itself is the main reason for staying.

Extension costs depend on the size and number of storeys, the specification of finishes, and how much structural work such as steel beams or underpinning is needed. Kitchen extensions with bifold doors and higher end finishes generally cost more than a simple boxy addition. An accurate price needs a site visit and a look at any drawings, since ground conditions and access both affect cost.

Most single storey extensions take around eight to twelve weeks from breaking ground to substantial completion, with double storey extensions typically taking several weeks longer. Foundations and brickwork usually take longer than internal finishing once the shell is weathertight. Poor weather, planning conditions or unexpected ground issues can all extend the programme.

A professionally built extension is generally worth it because the structural work, foundations, steel beams, roof structure, is what determines whether the finished space is safe, dry and durable. A poorly built extension can develop damp, cracking or structural problems that are expensive to put right later. Professional building also tends to produce a better match between old and new brickwork, which matters for how the finished house looks.

A properly built extension using sound materials and correct construction methods should last as long as the rest of the house, typically many decades with normal maintenance. Longevity depends heavily on foundation depth, damp proofing and roof detailing being done correctly at the time of build. Extensions built to current building regulations also tend to perform better for insulation and energy efficiency than older parts of a property.

A new build is a home constructed entirely from scratch on a plot, starting with groundworks and foundations and progressing through the full structural build to a completed, finished property. It differs from an extension or renovation because there's no existing structure to work around or build onto. New builds are typically managed as a single continuous project from breaking ground to handover.

A conversion is the process of turning an existing building, commonly a barn, garage or outbuilding, into a livable space, usually involving structural assessment, new insulation, damp proofing and full internal fitting out. The aim is generally to retain original character, exposed beams, stonework or brickwork, while meeting modern building standards. Conversions often need planning permission and building control involvement due to the change of use.

Costs vary enormously depending on the size of the build, the specification of finishes, and for conversions, the condition and structural complexity of the existing building. A barn conversion with significant structural work generally costs more than a straightforward new build shell. An accurate price needs a site visit and, ideally, drawings or a clear brief of what's wanted.

A typical new build home can take anywhere from six months to over a year depending on size and specification, while conversions vary considerably based on the condition of the existing structure. Groundworks and the structural shell usually take longest, with internal fit out following once the building is weathertight. Planning conditions, weather and the availability of specialist trades can all affect the overall timescale.

Professional management is generally essential for new builds and conversions, since coordinating groundworks, structural work, building control and multiple trades without experience is where projects commonly overrun or go wrong. A single point of contact managing the whole sequence reduces the risk of delays caused by trades working out of order. For conversions in particular, experience in assessing what can genuinely be retained safely is valuable.

Choosing a builder for a conversion usually comes down to relevant experience with older or non-standard buildings, since barns and outbuildings often throw up structural surprises that a straightforward new build wouldn't. It's worth asking how they approach retaining original features and how they've handled building control on similar projects. A builder willing to visit and properly assess the existing structure before quoting is generally a good sign.

A renovation involves updating an existing property, which can range from a single kitchen or bathroom refit to a complete whole house refurbishment covering structural work, services and finishes. It typically includes plastering, flooring, decorating and any electrical or plumbing work needed to bring the space up to standard. The scope varies hugely depending on the age and condition of the property and what the finished result needs to achieve.

Renovating rather than moving usually makes sense when the location itself is right but the property no longer suits how the family lives, or when a house has never been updated and needs bringing up to modern standards. It can also be more cost effective than moving once stamp duty, fees and the disruption of relocating are taken into account. A full refurbishment ahead of moving in is also common, since it avoids living through the work later.

Renovation costs vary enormously depending on the scope, from a single room refresh through to a full structural refurbishment, and on the specification of fittings and finishes chosen. Structural work such as removing walls or underpinning adds significantly more cost than cosmetic updates alone. An accurate price needs a site visit, since the condition of an older property often isn't clear until it's properly assessed.

A single kitchen or bathroom renovation typically takes two to four weeks, while a full whole house refurbishment can take several months depending on scope. Structural work and first fix services generally take longer than the final plastering and decorating stages. Older properties can throw up unexpected issues once work starts, which can affect the overall timescale.

A professionally managed renovation is generally worth it because sequencing trades correctly, structural work, then services, then finishes, avoids the cost and disruption of redoing completed work. Older properties in particular often reveal issues once walls or floors are opened up, which experienced management can handle without derailing the whole project. Professional finishing also tends to produce a more consistent standard across a full property refurbishment.

Choosing the right renovation builder usually comes down to seeing examples of similar projects, particularly properties of a similar age or condition, and getting a clear, itemised quote before work begins. It's worth asking how unexpected issues, common in older properties, are typically handled and priced. A builder willing to discuss the sequencing of the project, not just quote a headline figure, is generally a good sign.

Plastering is the application of a smooth finish to internal walls and ceilings, ready for painting or decorating, while rendering is a protective coating applied to external brickwork or blockwork. Both involve similar preparation and application techniques but use different materials suited to internal versus external conditions. Plastering is typically a smooth skim finish, while render can be smooth, textured or a decorative finish depending on preference.

New plastering is usually needed when existing plaster has cracked, blown or become uneven, or after building work such as an extension leaves new walls that need finishing. New rendering is typically needed when existing render has cracked or is letting damp into the brickwork, or when refreshing the exterior appearance of a property. Cracking around windows or doors is often an early sign that render needs attention before damp becomes a bigger problem.

Costs depend on the area being covered, whether it's a single room or a full property, and the type of finish chosen, particularly for external render. Rooms with awkward ceilings, coving or extensive prep work generally cost more than a straightforward flat wall. An accurate price needs a site visit, since the condition of the existing surface significantly affects preparation time.

A single room typically takes one to two days to plaster, including drying time between coats, while a full property can take a week or more depending on size. External rendering usually takes longer per area than internal plastering, since it needs to be applied in suitable weather conditions. Rushing drying times is one of the most common causes of cracking, so realistic scheduling matters more than speed.

Professional plastering and rendering are generally worth it because a smooth, flat, crack free finish depends on experience and proper technique that's hard to achieve without practice. Poorly applied plaster or render is prone to cracking, bubbling or uneven texture that shows clearly once painted or dry. Professional work also tends to match existing finishes more closely when only part of a property needs attention.

Well applied plaster can last for many decades with no significant maintenance, while properly applied render typically lasts fifteen to twenty five years depending on exposure and material. Longevity depends heavily on correct preparation and application rather than the finish alone. Render on more exposed elevations may need attention sooner than sheltered walls, regardless of how well it was originally applied.

Patio and driveway work involves excavating the area, building a properly compacted sub base, then laying paving, block paving or tarmac to create a durable outdoor surface. It typically includes edging, correct falls for drainage, and can extend to retaining walls or steps where ground levels change. The exact build up depends on ground conditions and how the finished area will be used.

New patios or driveways are usually needed when existing paving has cracked or sunk, when a driveway has become potholed or rutted, or when outdoor space is being brought up to the same standard as a house extension or renovation. Standing water after rain is often a sign the original base or falls were never right. It's also common to combine this work with a wider building project so everything is finished together.

Costs depend on the size of the area, the materials chosen, and how much groundwork is needed, particularly where levels change or drainage is more complex. Larger driveways or patios with retaining walls generally cost more than a straightforward flat area. An accurate price needs a site visit, since access, ground conditions and existing levels all affect the work involved.

A standard patio typically takes a few days to a week, while a driveway can take slightly longer depending on size and the surface chosen. Projects combining paving with retaining walls or drainage generally take longer than paving alone. Weather can affect timescales, particularly during excavation and when laying tarmac or setting concrete.

Professional outdoor work is generally worth it because the sub base and drainage, both hidden once finished, determine whether the surface stays level and drains properly. A shallow or poorly compacted base is the most common reason patios and driveways fail within a few years. Professional work also tends to integrate more neatly with the rest of a building project when the two are coordinated together.

Doing outdoor work alongside a wider building project often makes sense, since access, machinery and material deliveries can be coordinated together rather than repeated separately. It also means the finished result, extension or renovation and the outdoor space around it, are completed to a consistent standard at the same time. That said, patios, driveways and landscaping work perfectly well as standalone projects too.

Groundworks typically includes excavating and pouring foundations, installing drainage, preparing the oversite for a concrete slab, and managing site levels before a building project begins. It's the below ground work that every other stage of construction depends on, even though none of it is visible once finished. The specific scope depends on the project, ground conditions and what's being built above.

Structural work is usually needed when opening up a wall between rooms, when a wall being removed is load bearing and needs a steel beam to carry the weight above, or when ground conditions require underpinning to support existing foundations. Cracks appearing in walls, particularly around doors and windows, can be a sign that structural assessment is needed. Any building work involving removing or altering a load bearing wall requires proper structural calculation, not just removal.

Groundworks costs depend on ground conditions, the depth and type of foundations required, and how much drainage or site preparation is involved. Difficult ground, such as clay or a high water table, can significantly increase both cost and the specification needed. An accurate price needs a site visit and, ideally, a structural engineer's specification for anything involving steel beams.

Foundations for a typical extension usually take a few days to excavate and pour, plus curing time before building work continues on top. Larger new build groundworks packages can take one to two weeks depending on the size and complexity of the site. Weather has a significant effect on groundworks, since wet ground is harder to excavate and concrete needs suitable conditions to cure properly.

Professional groundworks work is essential rather than optional, since foundations and structural openings are the parts of a building most responsible for its long term safety and stability. Incorrectly sized foundations or an unsupported structural opening can lead to serious problems including cracking, subsidence or structural failure. Professional work also ensures the correct sign off from building control, which matters for future sale or insurance.

For most structural changes, such as removing a load bearing wall or underpinning, a structural engineer's calculations are needed alongside the building work itself. The engineer specifies what's required, such as beam size, and the builder carries out the physical work to that specification. A builder experienced in structural work will typically coordinate this process rather than leaving it for the homeowner to organise separately.