London couple (32): rent forever or buy by 35?

A London rent-vs-buy scenario pack that keeps childcare years and compounding in view — in today’s pounds.

Picture a misty Sunday in Walthamstow: two 32-year-old professionals eye a pushchair in the hallway, a Zone 3 rent review on the table, and a summer 2029 target to pull together a first-home deposit - likely just after a baby arrives in early 2029. Between them they net roughly £4.7k–£6.7k/month after PAYE, NI, and 5% workplace pensions. But any family-ready flat already rents for £1.9k–£2.8k/month in today’s money, and nursery quotes come in around £1,400/month.

This scenario pack compares two very human choices: keep renting (and keep more money compounding), or buy by 35 (and accept a tight liquid buffer right when childcare peaks).

All currency figures are shown in today’s pounds (the simulator uses a real, after-inflation return). Each path is run under three real-return assumptions (2.5% / 3.2% / 4.2%) so you can see how much the outcome depends on compounding.

Who this scenario is for

• Couples around age 32 who already rent in London Zones 2–4 and are planning a first child around 2029.
• Dual earners bringing home £4.7k–£6.7k/month combined after tax and minimum workplace pension contributions.
• Savers with about £50k in cash and the discipline to automate ~£2k/month before kids - but who expect childcare to squeeze cash flow for at least four years.
• House-hunters debating whether to stay nimble (rent + invest) or stretch to a £600k–£625k purchase with a ~15%–20% deposit.

Financial profile

• Age & timeline: 32 today, target retirement at 68, plan horizon to age 90.
• Location: Greater London renters looking to stay in Zone 3 once a baby arrives.
• Household income: £4.7k–£6.7k/month take-home (after PAYE/NI and 5% employee pension).
• Current savings: £50k cash buffer before any deposit withdrawals.
• Savings effort: Rent track averages £2,036/month; buy track averages £2,454/month.
• Savings path (shape): Save £2,000/month until age 34, drop to about £1,300/month in ages 35–39, then step up again in your 40s and 50s once childcare fades.
• Housing & family costs: £550/month rent upgrade or about £700/month higher ownership costs vs current rent; childcare £1,400→£900/month; then smaller ongoing kid costs.
• Buying costs (buy track): £100K deposit + £17K fees + £20K renovation, plus £20K major repairs + heat pump reserve (age 51) and £12K kitchen/bath refresh (age 56). These presets also assume £70K one-time family help toward the purchase so the household doesn’t go into debt during the deposit window.
• Other modeled goals: £20K car upgrades at ages 36 & 48, £15K university reserve, £8K milestone trip, and a £25K later-life care reserve - plus ongoing “wants” lines (family activities + lifestyle upgrades) before retirement.
• Retirement target: Plan for £4,000/month real spending in the rent track (plus a planned £200K housing gift for your adult child). In the pessimistic rent run, this pack assumes you tighten that to £3,500/month. For the buy track we use £3,800/month as the baseline and treat home equity as a separate decision.

At a glance: With £4,000/month retirement spending plus a planned £200K housing gift at retirement, the rent track finishes with ≈£117K liquid at age 90 in the base case and ≈£634K in the optimistic case. In the pessimistic rent run, this pack assumes you tighten retirement spending to £3,500/month, which finishes around ≈£57K liquid.

In the buy track, these presets assume £70K one-time family help toward the purchase so you don’t go into debt around the deposit window. On investable assets alone (home equity not counted), the pack finishes with ≈£440K liquid at age 90 in the base case, ≈£224K in the pessimistic case, and ≈£273K in the optimistic case (where we also model extra late-life family/care spending). Buffer-safe retirement spending lands in the ≈£2,605-£3,973/month range depending on returns (≈£3,087/month in the base case without tapping home equity).

What the numbers show

The key trade-off is liquidity vs ownership.

• Renting keeps more capital compounding for longer, so interest earned by retirement ranges from ≈£216K (pessimistic) to ≈£471K (optimistic).
• Buying by 35 ties up ≈£137K (deposit + fees + renovation) right as childcare peaks, so interest earned by retirement is ≈£140K-£297K in these presets (depending on returns).

How to read this: Effort/mo is the average monthly amount you’re investing during your working years (separate from workplace pension contributions). Safe is the estimated retirement spending level that keeps a 60‑month buffer in the model - use it as a planning guardrail, not a promise.

• Renting (base): Close to the £4,000/month target, but you’re budgeting above the “safe” guardrail (so you’d want either a bit less spending, a bit more saving later, or a bigger buffer).
• Renting (pessimistic): With lower returns, the liquid plan is short unless you reduce spending (or raise saving) later.
• Renting (optimistic): If markets are that kind, the extra cushion is where you’d fund late-life care, family support, bigger travel, or simply choose more spending earlier - it’s not a guaranteed leftover; the run ends with ≈£634K (roughly 13 years of spending), so plan specific uses or raise retirement spending rather than assuming it’s idle cash.
• Buying: You need slightly higher saving effort, but the bigger story is the deposit/fees/works cash drain right as childcare begins; on investable assets alone, retirement spending is tighter unless you plan to unlock home equity later.

“Safe” = the retirement spending level that keeps a 60‑month buffer in the model (use it as a planning guardrail, not a guarantee).

A quick fairness note: these rent presets include a £200K one-time family support gift at retirement age (an optional goal) and a late-life accessibility/care allowance (Base/Pess: £90K at age 85; Optimistic: £25K move + £120K care top-up). In other words, they’re not the “maximise wealth” version of renting.

Capital and interest figures report investable assets only, in today's pounds. Home equity is invisible unless you add a future sale or downsizing entry, so plan to monetise the property if you need that value later.

Average saving effort rises by just ≈£400/month in the buy path. The bigger difference is when the cash leaves your account: tying up ≈£137K early can mute compounding. In the base case, the rent-first plan compounds to about £306K of interest by retirement (and ≈£580K across the full horizon) versus about £197K by retirement (and ≈£584K across the full horizon) in the buy presets, despite their higher monthly effort and the assumed one-time family help at purchase.

The strategy

Active years - stay a renter for flexibility

The rent track starts with a £50K cash buffer and avoids a six-figure deposit drain. You still pay the normal one-offs (move, baby prep, car) from your liquid pot, so the buffer can dip during expensive months.

The shape is:

• Age 34: rent steps up by £550/month to get a Zone 3 two-bed.
• Childcare years: £1,400/month for ages 0–3, then £900/month once funded hours arrive (ages 3–4).
• After childcare: kid costs continue as smaller monthly lines (e.g., £280/month through the teen years), plus separate “wants” lines (family activities + lifestyle upgrades).
• Saving effort over time: saving dips into the low £1Ks while rent and nursery overlap, then rebuilds to about £1,850/month in the 40s and £2,350/month in the 50s+.

Because no deposit leaves the account, the base case earns ≈£306K of interest by retirement (and ≈£580K across the full horizon). In the pessimistic run, £4,000/month retirement spending plus the planned £200K housing gift is simply too much for the liquid plan - so this pack models a tighter £3,500/month retirement budget in that variant (the “buffer-safe” line is still around £3,087/month).

Active years - buy by 35 without blowing up cash flow

Buying requires patience - and comfort with a tight cash buffer for a few years.

In the preset, the timeline looks like this:

• Ages 32–34: save hard at roughly £2k/month.
• Age 35: pay £100K deposit + £17K fees, then £20K of post-purchase work.
• From age 35 onward: housing costs are modeled as about £700/month higher than the current rent (mortgage + council tax + maintenance as a planning anchor).
• Mid-life realism: ownership includes a modeled £20K major repair/upgrade shock around age 51, plus a £12K refresh around age 56.

In practice, that means liquid savings can get uncomfortably low right when childcare starts, unless you explicitly plan a short-term bridge. In these presets, the buy path supports roughly £2,605/month (pessimistic) to £3,087/month (base) of buffer-safe retirement spending on investable assets alone (the optimistic buy variant also includes extra late-life family/care spending, so its “safe” number is closer to £3,973/month without tapping home equity).

Because the buy track here assumes £70K one-time family help at the purchase date, the liquid pot stays above zero in the modeled timeline — but it’s still a good idea to keep a separate emergency buffer outside your deposit money.

Retirement years - keep spending in today's money

Both paths assume the full £1,900/month UK State Pension (i.e., two full NI records; Child Benefit can provide NI credits if one parent pauses work). The rent track targets £4,000/month real spending, while the buy track uses £3,800/month as the baseline and expects you to plan separately for unlocking home equity if needed.

Remember: all amounts are in today's money. If inflation runs at 2%, the nominal pound amounts you'll actually withdraw later will be higher - but the simulator already nets that out so you can think in real purchasing power.

Country-specific notes

• Deposits & wrappers: The £100K deposit is modeled as general savings. A Lifetime ISA bonus can help only if you meet the conditions (including buying your first home for £450k or less), so for a £600k–£625k purchase you should assume the deposit comes from taxable savings and/or family help. If family help is likely, log it as an upfront gift so the simulator knows those pounds don't erode your emergency fund.
• Stamp Duty & price caps: First-time buyer SDLT relief fades above £625K. Change the "Purchase fees + SDLT + legals" entry if your target flat is pricier or if this isn't your first purchase.
• Childcare support: Tax-Free Childcare adds 20% (up to £2k/year per child) so long as each earner makes at least £8,670/year (and meets the other eligibility rules). Funded hours extend down to nine months old starting September 2025, but most nurseries still charge for meals and extras - leave room.
• Child Benefit & NI credits: Claiming can help you build NI credits, but households with one earner above £60k face the High Income Child Benefit Charge. Decide whether to repay the benefit or to claim in the lower earner's name for credits only.
• Pensions inside payroll: The take-home pay figures already assume 5% employee contributions with employer match covering the rest of auto-enrolment. If your employer contributes more (10-12%), reduce the net income inputs rather than double-counting pension savings.

Customize this scenario

When the preset opens, choose the path closest to your situation as the baseline, then edit the assumptions that genuinely differ.

• Shift the savings cadence: If cash flow is tighter, lower the mid-30s contribution placeholder below £1,300/month and add a manual pay rise later. Higher earners can mirror the optimistic rent track and add extra contributions from age 55 onward.
• Move the purchase window: Bring the deposit, fee, and renovation entries forward or backward to match when you could realistically buy. Update the housing cost uplift with quotes from current five-year fixes plus service charges.
• Refine childcare and school costs: Swap in your own nursery fees, after-school club charges, or grandparents' help. If funded hours will fully cover age 3-4, zero out that entry and redirect the money to mortgage overpayments.
• Stress-test retirement: Edit the "Retirement spending" entry between £3,000 and £5,000/month and re-run the projection. Watch how quickly each path loses its buffer when you layer on market shocks.
• Model home equity exits: Add a downsizing or equity-release entry if you expect to tap the property after age 70. Without it, the buy path under-reports your true wealth and may look harsher than reality.

This scenario is an educational model, not personal financial advice. It simplifies UK tax, benefit, housing, and childcare rules so you can stress-test decisions before speaking with a qualified professional.