Garden Design After a House Extension

The extension is finished. The new kitchen is complete, the decorating is done and the builders have finally left.

Then you look through the new doors into the garden.

What was previously an acceptable outside space can suddenly look completely disconnected from the house. The lawn may have been damaged by machinery and foot traffic, planting may have disappeared beneath scaffolding, and the old patio may no longer relate to the scale or position of the new extension.

Changes made during construction can also leave awkward steps, disturbed ground, drainage problems and unfinished edges around the building.

Kirman Design provides garden design and landscaping after house extensions throughout Lancashire, Cheshire, Greater Manchester, Merseyside, the Ribble Valley, Cumbria and the wider North West.

Rather than simply repairing what the builders have damaged, we can reconsider the relationship between your extended home and garden—creating an outside space that completes the transformation of the property.

What Happens to a Garden During an Extension?

Even when reasonable precautions are taken, building an extension can be extremely disruptive to the surrounding garden.

Construction may involve:

• Scaffolding

• Excavation and foundation work

• Mini diggers and machinery

• Skips

• Temporary access routes

• Storage of building materials

• Removal of existing paving

• Alterations to drainage

• New utility routes

• Compaction of the soil

• Removal of trees, shrubs or hedging

• Changes to existing ground levels

Lawns may be heavily compacted or contaminated with building debris. Existing planting can be damaged, while temporary routes used by builders can become muddy or waterlogged.

An extension can also change how rainwater moves across the property. Areas that previously drained adequately may begin to hold water after the building footprint, paving or ground levels have changed.

The finished garden may therefore require considerably more than new turf and a few replacement plants.

Do Not Just Repair the Garden—Reconsider It

It can be tempting to repair only the visible damage.

That might mean replacing the lawn, extending the old patio and adding a few plants around the edges. Although this may make the garden look tidier, it does not necessarily respond to the way the property has changed.

A house extension often creates:

• A new principal entrance into the garden

• Larger views through bifold or sliding doors

• A kitchen or family room overlooking the garden

• Different internal and external levels

• New areas of sunlight or shade

• A greater need for outdoor dining

• New privacy concerns

• A different relationship with neighbouring properties

Restoring the old garden exactly as it was may mean missing the opportunity created by the extension.

A complete garden transformation allows the landscape to be designed around the property you have now—not the house that existed before the building work began.

Complete the Investment in Your Home

A substantial extension is usually part of a much wider investment in a property.

The architecture, kitchen, flooring, lighting and interior finishes may all have been carefully selected. The garden should feel like the continuation of that investment rather than an unfinished area beyond the glass.

A successful post-extension garden design considers:

• The architecture of the original house

• The appearance of the new extension

• Views from inside

• External levels and thresholds

• The dimensions of the main terrace

• Paving materials

• Surface-water drainage

• Outdoor dining and seating

• Planting

• Lighting

• Privacy

• Movement through the garden

• Existing features worth retaining

These elements can then be developed as one connected landscape rather than a series of unrelated improvements.

Designing the View Through Your New Doors

Contemporary extensions frequently introduce large areas of glazing.

You may now see the garden from the kitchen island, dining table or sofa throughout the day. Features that were previously hidden or relatively unimportant may have become prominent.

That view deserves to be designed.

Planting, trees, water features, sculptures and architectural details can be positioned to create deliberate compositions when seen from inside. These focal points give the garden a presence throughout the year, even when you are not outside.

A specimen tree might frame the centre of a sliding door. Layered planting could screen an unattractive boundary, while a water feature or sculpture might complete the view from the dining table.

After sunset, carefully planned garden lighting can maintain this connection and prevent the glazing from becoming a large, dark reflective surface.

Replacing or Redesigning the Old Patio

One of the most common problems after an extension is an old patio that no longer works.

It may be:

• Too small for the new elevation

• In the wrong position

• Out of alignment with the new doors

• At an awkward level

• Constructed from unsuitable or damaged materials

• Too narrow for outdoor furniture

• Disconnected from the wider garden

• Poorly drained

Simply adding another strip of paving is rarely the most effective solution.

The new terrace should be designed around its intended use. It may need space for:

• A dining table and chairs

• Lounge furniture

• An outdoor kitchen or barbecue

• Planters and planting beds

• A pergola

• A fire feature

• Routes into the wider garden

• Comfortable movement around the furniture

Our garden paving service considers the terrace as part of the complete garden rather than treating it as an isolated surface.

Getting the Scale of the Terrace Right

An extension can considerably increase the apparent scale of the house.

A patio that once looked adequate may suddenly appear narrow and disproportionate beneath a wider extension and large glazed doors.

The correct terrace size should respond to both the architecture and the furniture it needs to accommodate.

A dining table requires more room than the dimensions of the tabletop. Chairs need to be pulled back, and people need to move around them without being squeezed against walls, steps or planting.

An outdoor sofa arrangement also needs sufficient space for side tables, circulation and a comfortable relationship with surrounding features.

However, bigger is not automatically better. An unnecessarily large area of paving can feel exposed, increase drainage demands and reduce opportunities for planting.

Good design finds the appropriate balance between usable space, comfortable proportions and the wider garden.

Creating Level Access from the Extension

New extensions often leave a difficult transition between the internal floor and existing garden.

Where technically feasible, reducing the visual and physical difference between inside and outside can create a much stronger connection.

Our approach to level access from the house to the garden considers:

• Door thresholds

• Damp protection

• External paving levels

• Paving falls

• Channel drainage

• Accessibility

• Construction tolerances

This can be especially valuable for wheelchair users, people with reduced mobility and families with young children. A well-considered threshold can, however, improve how the garden functions for almost everyone.

Level access should never be created by simply raising paving against the house without addressing drainage and damp protection.

Resolving Awkward Garden Levels

Extensions can create significant differences between the finished floor level and the existing ground.

Although these may initially look like problems, they can become positive elements of the new design.

Possible solutions include:

• Generous garden steps

• A sequence of terraces

• Retaining walls

• Raised planting beds

• Integrated seating

• Sloping paths or ramps

• Changes in paving material

• Planted level transitions

The objective is not necessarily to flatten the whole garden. It is to create levels that feel deliberate, comfortable and properly connected.

Walls, steps and raised beds can provide structure, while planting softens the construction and prevents the finished garden from feeling overly hard.

Sorting Out Drainage After Building Work

Drainage problems often become apparent after an extension has been completed.

The building footprint has increased, and additional hard surfaces may have reduced the amount of permeable ground. Existing drainage routes may have been interrupted, while machinery and stored materials can heavily compact the soil.

Water that previously dispersed through the garden may begin to collect:

• Against the house

• Around door thresholds

• On new or existing paving

• Within lawns

• At the base of retaining walls

• In newly planted areas

• At the lowest point of the site

This deserves particular attention in North West England, where prolonged rainfall and heavy soils can already make gardens difficult to drain.

Our garden drainage solutions incorporate surface-water management into the landscape design before expensive paving, lawns and planting are installed.

Soil Compaction and Contaminated Ground

One of the less visible consequences of building work is soil compaction.

Repeated machinery movements, foot traffic, scaffolding and the storage of heavy materials can compress the ground considerably. This reduces the space available for air and water within the soil.

The result may be:

• Persistent waterlogging

• Poor lawn establishment

• Weak plant growth

• Surface runoff

• Hard, difficult-to-work soil

• Restricted tree and shrub roots

Building debris and leftover concrete can also remain beneath the surface.

Simply covering compacted ground with topsoil or laying turf over it will not resolve the underlying problem. Ground preparation, cultivation, removal of debris and drainage improvements may be necessary before the visible garden is installed.

These works can be incorporated into the landscape construction process.

Landscaping Immediately After the Builders Leave

There can be advantages to moving from building work directly into landscaping.

Access routes may already be open, and parts of the garden may already be disturbed. Excavation, drainage, retaining structures and major paving work can potentially be completed before access becomes restricted again.

However, the handover between the builder and landscaper needs careful planning.

Before landscaping begins, it is important to establish:

• Whether all building work is genuinely complete

• Who is responsible for unfinished external details

• Whether drains and services have been recorded

• Whether scaffolding or skips still need access

• If boundary work remains outstanding

• Whether the extension has suitable drainage

• Which ground levels are permanent

• Whether construction waste has been removed

The new landscaping should not be used to conceal unresolved building defects or incomplete work.

Reconnecting the House and Wider Garden

A successful post-extension garden should make the transition from architecture to landscape feel natural.

Close to the house, the design may respond quite strongly to the geometry of the extension. Paving joints, walls, paths and planting beds can relate to doors, windows and architectural lines.

Further into the garden, the landscape can gradually become softer and more informal.

Lawns, trees and generous planting can connect the architectural area around the extension with the wider garden. This helps prevent the terrace from feeling like a separate platform attached to the building.

In larger gardens, secondary seating areas and destinations can draw people away from the house. Our garden design for large gardens considers how these different spaces can form one coherent landscape.

Planting Around the Finished Extension

A newly completed extension can initially appear very architectural.

Large areas of glass, brick, render and paving benefit enormously from planting. Beds positioned close to the terrace can soften the building and help the new construction settle into the garden.

A planting scheme may include:

• Structural evergreen shrubs

• Flowering shrubs

• Ornamental grasses

• Herbaceous perennials

• Climbers

• Ground-cover plants

• Multi-stem trees

• Specimen shrubs

• Seasonal bulbs

Planting should be selected for the soil, aspect and exposure as well as its appearance.

It should also be designed for views from inside. Evergreen foliage, bark, structural stems, seed heads and carefully positioned trees can provide interest through autumn and winter.

Our planting design service develops the planting as part of the complete landscape rather than adding plants once every other decision has been made.

Adding Trees to the Redesigned Garden

Trees can help a newly landscaped garden feel established and balance the scale of an extended house.

A carefully positioned tree may:

• Frame a view from the extension

• Provide privacy

• Filter a neighbouring window

• Screen an unattractive structure

• Give summer shade

• Add height and seasonal interest

• Connect the new design with retained mature planting

Multi-stem trees can be particularly effective around contemporary extensions because their trunks and canopies create interest without forming a solid visual barrier.

Where access permits, larger specimen trees can provide more immediate impact.

Every tree must still be selected for its eventual height, spread and suitability for the available root environment.

Restoring Privacy After an Extension

Extensions can unexpectedly create privacy issues.

Moving a kitchen, dining room or main living space closer to the garden may make neighbouring windows more noticeable. Large glazed doors can also make the interior feel exposed, especially when the lights are on after dark.

Effective screening does not always need to sit directly against the boundary.

A considered privacy strategy might use:

• Strategically positioned trees

• Multi-stem planting

• Pleached trees

• Hedging

• Pergolas

• Decorative screens

• Climbers

• A change in seating position

• Carefully placed focal points

Targeted screening can interrupt important sightlines without making the entire garden feel enclosed.

Our garden screening ideas explore different ways to improve privacy while retaining light, space and an attractive outlook.

Creating Outdoor Dining and Entertaining Areas

A new kitchen extension often creates the ideal opportunity for outdoor dining.

The terrace can be positioned so food and drinks move easily between the indoor kitchen and outside dining area. There should be enough room to move chairs comfortably and circulate around the table.

Planting can give the space a sense of enclosure, while lighting allows it to remain inviting during the evening.

For homeowners who entertain regularly, an outdoor kitchen can become a natural continuation of the internal kitchen.

Its position needs careful consideration. It should be convenient without dominating views through the new glazing. Electricity, water and other required services should also be planned before the surrounding paving is completed.

Adding a Pergola or Garden Structure

A garden pergola can help define a dining, seating or outdoor cooking area.

This may be particularly effective where an extension opens onto a substantial garden and the new terrace initially feels exposed.

A pergola can:

• Create partial enclosure

• Provide filtered shade

• Support climbing plants

• Improve privacy

• Frame an outdoor room

• Accommodate lighting

• Connect seating and cooking areas

Its scale should respond to the extension and the wider garden. It should not obstruct important views or unnecessarily reduce natural light entering the house.

What Should Be Retained from the Original Garden?

A complete redesign does not mean everything needs to be removed.

Existing mature trees, hedges, walls and good-quality planting can provide character and maturity that would take years to recreate.

We assess what is worth retaining before developing the new design.

An established tree in the right position may become one of the strongest elements in the finished garden. An old path leading towards a door that no longer exists is less likely to be useful.

The objective is not to create a completely new garden simply for the sake of it. It is to create the right garden for the newly altered property.

Garden Design After Extending a Period Property

An extension to a Victorian, Edwardian, Georgian or other character property creates another layer of design consideration.

The new architecture may be highly contemporary while the original building remains traditional. The garden can help bridge these different styles.

Clean lines close to the extension might be combined with natural stone, existing walls, mature trees and more generous planting. The finished garden does not need to be entirely traditional or entirely contemporary.

Our garden design for period properties considers how modern outdoor living can be introduced while respecting the character of the original house.

Can the Garden Be Completed in Phases?

Larger post-extension landscaping projects can sometimes be divided into phases.

The complete garden should ideally be designed first, even if it will not all be built at once.

A masterplan ensures that the early phases take account of:

• Future drainage

• Underground services

• Final ground levels

• Access for machinery

• Later structures

• Lighting cables

• Tree positions

• Future planting

This reduces the risk of one completed area having to be disturbed to construct another.

Our Post-Extension Garden Design Process

Initial Consultation

We discuss the extension, the condition of the garden, how you want to use the space, your priorities, budget and timescale.

Site Assessment and Survey

The garden is assessed for levels, drainage, access, existing features and construction damage. Architectural drawings and relevant information from the building project can also be reviewed.

Concept Design

The concept establishes the overall layout, including terraces, paths, level changes, planting, screening and outdoor-living areas.

Detailed Design

Once the layout has been agreed, detailed information can be developed for construction, materials, planting, lighting and other features.

Landscape Construction

Our landscaping team can carry out the ground preparation, drainage, paving, walls, steps, structures and other construction required to create the garden.

Planting and Completion

Planting, lawns, trees, lighting and finishing details complete the transformation and help the new landscape settle around the extended property.

Examples of our completed projects can be seen in the Kirman Design portfolio.

Why Choose Kirman Design?

Kirman Design has more than 20 years’ experience creating distinctive gardens and landscapes.

We combine garden design, planting design and landscape construction, providing continuity from the damaged or outdated garden left after building work to the finished landscape.

Andy Kirman is a Registered Member of the Society of Garden and Landscape Designers. Kirman Design is also associated with recognised professional landscaping organisations, including BALI and the Association of Professional Landscapers.

Our objective is not simply to repair the garden. It is to create an outside space that feels properly connected to the home you have invested in.

Garden Design After Extensions Across North West England

We redesign and landscape gardens following house extensions and renovations throughout:

• Lancashire

• Cheshire

• Greater Manchester

• Merseyside

• The Ribble Valley

• Cumbria

• South Manchester

• West Lancashire

• Wirral

• The Fylde Coast

• The wider North West

We work with contemporary homes, family houses, rural properties and period properties that have been extended or remodelled.

Frequently Asked Questions

When should I contact a garden designer after an extension?

You can contact us while the extension is being built or after it has been completed. It is best to establish the garden design before making permanent repairs to lawns, paving or ground levels.

Can you repair a garden damaged by builders?

Yes. Depending on the damage, the work may involve removing debris, improving compacted ground, resolving drainage, adjusting levels, replacing paving and lawns, and introducing new planting.

Should I replace my patio after an extension?

Not necessarily. If the existing patio is in good condition and works with the new layout, it may be possible to retain it. However, extensions frequently change the scale, position and level required for the main terrace.

Can landscaping begin immediately after the builders finish?

Often it can, provided the building work is genuinely complete and the site is ready to hand over. Moving directly into landscaping can preserve access and allow disturbed ground to be dealt with efficiently.

Can you create level access from my extension?

Potentially. The feasibility depends on the existing levels, thresholds, damp protection, paving falls and drainage requirements.

Can mature trees and existing planting be retained?

Yes. Valuable trees, hedges, walls and established planting can be incorporated where they contribute to the new layout.

Can you add an outdoor kitchen after an extension?

Yes. An outdoor kitchen can work particularly well with a kitchen extension, provided its location, services, paving, dining space and relationship with views from inside are properly considered.

Can you landscape around an extension to a period house?

Yes. The garden can help connect a contemporary extension with the original architecture and setting of a period property.

Can you complete the garden in phases?

Yes. Phased implementation may be possible, but the overall garden should ideally be designed first so drainage, levels, services and access are properly coordinated.

Do you provide the landscaping as well as the design?

Yes. Kirman Design provides garden design, planting design and landscape construction, allowing us to take the project from the initial ideas through to the completed garden.

You Have Finished the House—Now Complete the Garden

After months of building work, it is understandable to want the project finished.

However, repairing the lawn and extending the old patio can mean missing the opportunity created by the new extension.

The house has changed. The way you see and use the garden has changed with it.

A considered garden design can bring the two together, creating a landscape that feels like the final part of the renovation rather than an afterthought.

Contact Kirman Design to discuss transforming the garden left after your extension or renovation.